Articles de revues : « Electrodos de platino »

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Rodríguez-Yáñez, Javier E. « Deposición de Sn en Pt policristalino para su aplicación en la oxidación de metanol ». Revista Tecnología en Marcha 29, n^o 1 (20 avril 2016) : 3. http://dx.doi.org/10.18845/tm.v29i1.2534.

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Se evaluaron tres diferentes métodos de deposición de estaño en platino policristalino (Pt pc) desde una solución de ácido sulfúrico utilizando técnicas electroquímicas convencionales, con el fin de determinar y comparar su influencia en la oxidación de metanol. Los métodos probados fueron deposición espontánea, deposición a subpotenciales y deposición cíclica a subpotenciales. El estaño fue depositado desde una solución de SnSO4 en ácido sulfúrico. Se utilizó la reducción del perfil voltamétrico en el área de adsorción de hidrógeno en el platino por el estaño para calcular el grado de cubrimiento de la superficie por el mismo. La adsorción de metanol y su oxidación se compararon entre los electrodos de platino y platino/ estaño, considerando la eficiencia de oxidación de metanol con respecto al área libre de platino como parámetro comparativo.

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Abadía López, Julieth, Claudia L. Pérez Valdés et Mario Grajales Tamayo. « Electroquímica de Oro en Ácido Clorhídrico ». Revista de Ciencias 13 (4 septembre 2011) : 93–104. http://dx.doi.org/10.25100/rc.v13i0.647.

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Se investigó la electroquímica del oro en soluciones clorhídricas ácidas usando voltamperometría cíclica y voltamperometría de redisolución anódica. Los resultados demostraron que la disolución del oro y la formación de óxidos de oro ocurren a potenciales por encima de +0.9 V (vs. Ag / AgCl )• La reducción de AuCl4 sobre electrodo de grafito pirolítico rugoso (RPG) procede con adsorción lenta y mostró un pico bien definido a +0.55 V; este pico presentó una pobre resolución con electrodos de platino y carbono vitreo. La HAuCl4 H^PdC^ y HAUCI4 0.45 V durante cuatro minutos (tres de agitación más uno de reposo) y redisolviendo con un barrido lineal desde +0.0 hasta+1.15 V a H2PdCl4 HAuCl4 a-0.28 V, se depositan simultáneamente Au, Pd y una aleación Au-Pd. A 0.45 V únicamente se deposita Au. La voltamperometría de redisolución anódica fue aplicada con buenos resultados a la determinación de oro en lixiviados clorhídricos provenientes de la precipitación de platino como (NH4)2PtCl6.

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Pizarro-Aguilar, Yaritza, Jaime Ordoñez-Santander, Carolina Mackliff-Jaramillo, Andres Medina-Preciado et Marisela Segura-Osorio. « ECOFARMACOVIGILANCIA Y LA DETERMINACIÓN DEL DICLOFENACO SÓDICO MEDIANTE ELECTROANÁLISIS ». CIENCIA UNEMI 12, n^o 31 (26 septembre 2019) : 54–63. http://dx.doi.org/10.29076/issn.2528-7737vol12iss31.2019pp54-63p.

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El Diclofenaco se ha convertido en un medicamento muy consumido por los pacientes debido a su acción farmacológica antiinflamatoria, que disminuye el efecto de las prostaglandinas, causantes de la inflamación y dolor. Por su disposición final inadecuada, ocasiona alrededor del mundo problemas a nivel ecológico, específicamente en la fauna. Siendo parte del grupo de contaminantes emergentes, que no están regulados, a pesar del efecto tóxico capaz de alterar la biósfera, por ejemplo, extinción de buitres asiáticos, 100% mortalidad de embriones pez cebra a concentraciones (100mg/L) con 70% de similitud al genoma humano. Esta investigación planteó la determinación de diclofenaco sódico en soluciones acuosas mediante técnica electroanalítica de escaneo lineal (LSV). Se utilizó un electrodo serigrafiado de carbón vítreo modificado con nanotubo de carbono (WMCNT/SGCE) que contiene un sistema integrado de electrodos auxiliar (electrodo de platino) y de referencia (electrodo de plata- cloruro de plata Ag/AgCl). El estudio de pH abarcó un abanico de potencial desde 0.25 V hasta 0.95 V, obteniéndose un mejor desarrollo electroquímico en medios ácidos. Se construyeron curvas de calibrado a partir de comprimidos comerciales y un patrón de DCF (USP). La linealidad, exactitud, precisión del método fueron significativas.

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Ramos, Carlos, Anthony Huamán, María Quintana et Walter Estrada. « FABRICACIÓN DE ELECTRODOS NANOESTRUCTURADOS DE ZnO PARA APLICACIONES FOTOVOLTAICAS ». Revista Cientifica TECNIA 23, n^o 2 (13 mars 2017) : 45. http://dx.doi.org/10.21754/tecnia.v23i2.75.

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Se fabricaron electrodos para celdas solares sensibilizadas con colorante (DSCs) que consisten en nanopartículas de ZnO depositadas sobre sustratos conductores de SnO2:F. Las nanopartículas de ZnO fueron fabricadas por la técnica de molienda mecánica en medio húmedo las cuales sirvieron para obtener una pasta viscosa que fue depositada sobre el sustrato por la técnica dr. blade. Luego de sinterizarlas se procedió a sensibilizarlas con colorantes orgánicos o metalorgánicos como el D35 y el N719 respectivamente durante aproximadamente 14 horas. Se utilizaron electrolitos líquidos donde uno de ellos contiene al par redox yoduro (I-) triyoduro (I-3 ) y el otro usa un complejo con cobalto reducido (Co(bpy)3(PF6)+2/+3); como contraelectrodos se usó el platino y el polímero PEDOT. Las celdas selladas reportaron eficiencias máximas de 1.6% y valores en la conversión de fotones a corriente (IPCE) de aproximadamente 60% para una longitud de onda de 500nm.. Palabras clave.-Molienda mecánica, Nanopartículas de ZnO, Corriente-voltaje, IPCE. ABSTRACTElectrodes for Dye Sensitized Solar Cells (DSCs) were made using ZnO nanoparticles deposited over conductive substrates of SnO2:F (FTO). ZnO nanoparticles were obtained by the wet ball milling technique. Then these particles were used to make a viscous paste which was deposited over the substrate by the dr. lade method. After sintering, the electrodes were sensitized with organic and metalorganic dyes like D35 and N719 respectively during 14 hours. Liquid electrolytes with redox mediators like iodide/ triiodide redox cuple and cobalt complexes were used. Also platinum and polymer (PEDOT) covers were used like counterelectrodes. Sealed cells reported efficiencies values as high as 1.6% and values for incident photo conversion efficiency (IPCE) close to 60% at 500nm.. Keywords.-Ball milling, ZnO nanoparticles, Current-voltage, IPCE..

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Jin, L., K. J. Kim, E. H. Song, Y. J. Ahn, Y. J. Jeong, T. I. Oh et E. J. Woo. « Highly precise nanofiber web-based dry electrodes for vital signal monitoring ». RSC Advances 6, n^o 46 (2016) : 40045–57. http://dx.doi.org/10.1039/c6ra00079g.

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Dry electrodes have been prepared through silver-plating elastic TPU and SBS electrospun nanofiber webs to improve electrode accuracy. The results revealed that the new dry electrodes can exhibit performance comparable to Ag/AgCl gel electrode.

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Lou, Bai Yang, Pei Hua Li et Xiao Li. « The Study on Electrocatalysis Properties of Pt / Co Coated Graphite Electrode ». Key Engineering Materials 474-476 (avril 2011) : 224–27. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.224.

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Direct methanol fuel cell (DMFC) is one of the ideal powers of low-power portable electrical devices, witch is cheap, safe, easy to store and rich source of fuel, and is more and more attentive and researched in recent years. In this paper, graphite electrode samples were coated by chemical plating Co and then by vacuum ion plating Pt. The microstructure of samples were observed by scanning electron microscope SEM and X-ray fluorescence spectrometry to analyze XRF then determined the surface composition of graphite electrode. The electrocatalysis properties of graphite electrodes were studied by electrochemical impedance spectra (EIS), cyclic voltammeter (CV) and linear sweep voltammeter (LSV). The results show that electrocatalysis properties of methanol on the electrode was stronger as the chemical plating time extended and methanol concentration increase if the parameters of the plating Pt in a vacuum ion plating process was unchanged, and Co Chemical Plating time was shouter than 120s.

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Portilla, Hans, Aldo Castillo, César Arévalo, Fabio Cabrera, Juan Vega et Alexander Vega. « Reduction of hexavalent chrome from artificial effluent of chrome : Batch electrocoagulation method [Reducción del cromo hexavalente de efluente artificial de cromado : Método de electrocoagulación por lotes] ». Journal of Sciences and Engineering 4, n^o 2 (6 décembre 2020) : 33. http://dx.doi.org/10.32829/sej.v4i2.193.

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The present research evaluated treatment time, electrode area / effluent volume ratio, on the% reduction of hexavalent chromium in artificial chrome plating effluents, was evaluated by the batch electrocoagulation method; Method for which A-36 steel anodes and cathodes of (5.0 x 5.0 x 0.2) cm were used. The number of electrodes and the separation between them was varied in order to vary the ratio of electrode area / effluent volume and; for a batch type electrocoagulation reactor in which 27 tests were carried out; keeping the volume of effluent treated constant. From the results obtained, it was determined that the increase in the electrocoagulation time and the electrode area / effluent volume ratio influence the percentage of hexavalent chromium reduction of the artificial chromium plating, as supported by ANOVA and test F; the maximum reduction percentage achieved was 91.65%, with respect to the initial concentration (20 mg/L), for a test time of 60 minutes and a ratio of electrode area / effluent volume of 0.912 m2/L.

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Yun, Seong Min, Injoon Son et Sung Hwa Bae. « Effect of Plating Layers on the Bonding Strength of p-Type Bi–Te Thermoelectric Elements ». Journal of Nanoscience and Nanotechnology 21, n^o 8 (1 août 2021) : 4503–7. http://dx.doi.org/10.1166/jnn.2021.19433.

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In thermoelectric modules, multiple n-type and p-type thermoelectric elements are electrically connected in series on a Cu electrode that is bonded to a ceramic substrate. Defects in the bond between the thermoelectric elements and the Cu electrode could impact the performance of the entire thermoelectric module. This study investigated the effect of plating layers on the bonding strength of p-type Bi–Te thermoelectric elements. Ni and Pd electroplating was applied to Bi–Te thermoelectric elements; further, electroless Ni–P immersion gold (ENIG) plating was applied to Cu electrodes bonded to ceramic substrates. Forming a Pd/Ni electroplating layer on the surface of thermoelectric elements and an ENIG plating layer on the surface of the Cu electrode improved the bonding strength by approximately 3.5 times. When the Pd/Ni and ENIG plating layers were formed on Bi–Te elements and Cu substrates, respectively, the solderability greatly increased; as the solderability increased, the thickness of the diffusion layer formed with the solder layer increased. The improved bonding strength of the Pd/Ni plated thermoelectric element bonded on the ENIG plated substrate is attributed to the enhanced solderability due to the rapid inter-diffusion of Pd and Au into the solder layer and the formation of a stable and non-defected solder reaction interface layer.

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Šelešovská, Renáta, Pavlína Martinková, Michaela Štěpánková, Tomáš Navrátil et Jaromíra Chýlková. « Comparison Study of Voltammetric Behavior of Muscle Relaxant Dantrolene Sodium on Silver Solid Amalgam and Bismuth Film Electrodes ». Journal of Analytical Methods in Chemistry 2017 (2017) : 1–12. http://dx.doi.org/10.1155/2017/3627428.

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Voltammetric behavior of muscle relaxant dantrolene sodium (DAN) was studied and the voltammetric methods for its determination using polished and mercury meniscus modified silver solid amalgam electrodes (p-AgSAE and m-AgSAE) as well as using bismuth film electrode (BiFE, ex situ plating on GCE) have been proposed. These working electrodes represent the most commonly used alternatives to mercury ones which come wrongfully into disfavor because of alleged toxicity of mercury. Within this work, the obtained results of DAN determination have been completed by corresponding statistical parameters and also some electrochemical characteristics of AgSAEs and BiFE were assessed, especially in comparison with the mercury electrodes.

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Pang, Quan, Laidong Zhou et Linda F. Nazar. « Elastic and Li-ion–percolating hybrid membrane stabilizes Li metal plating ». Proceedings of the National Academy of Sciences 115, n^o 49 (19 novembre 2018) : 12389–94. http://dx.doi.org/10.1073/pnas.1809187115.

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Lithium metal batteries are capable of revolutionizing the battery marketplace for electrical vehicles, owing to the high capacity and low voltage offered by Li metal. Current exploitation of Li metal electrodes, however, is plagued by their exhaustive parasitic reactions with liquid electrolytes and dendritic growth, which pose concerns to both cell performance and safety. We demonstrate that a hybrid membrane, both elastic and Li+-ion percolating, can stabilize Li plating/stripping with high Coulombic efficiency. The compact packing of a Li+ solid electrolyte phase offers percolated Li+-conducting channels and the consequent infiltration of an elastic polymer endows membrane flexibility to accommodate volume changes. The protected electrode allows Li plating with 95.8% efficiency for 200 cycles and stable operation of an LTO|Li cell for 2,000 cycles. This rationally structured membrane represents an interface engineering approach toward stabilized Li metal electrodes.

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Wahab, Hassan A., M. Y. Noordin, S. Izman et Denni Kurniawan. « Quantitative Analysis of Electroplated Nickel Coating on Hard Metal ». Scientific World Journal 2013 (2013) : 1–6. http://dx.doi.org/10.1155/2013/631936.

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Electroplated nickel coating on cemented carbide is a potential pretreatment technique for providing an interlayer prior to diamond deposition on the hard metal substrate. The electroplated nickel coating is expected to be of high quality, for example, indicated by having adequate thickness and uniformity. Electroplating parameters should be set accordingly for this purpose. In this study, the gap distances between the electrodes and duration of electroplating process are the investigated variables. Their effect on the coating thickness and uniformity was analyzed and quantified using design of experiment. The nickel deposition was carried out by electroplating in a standard Watt’s solution keeping other plating parameters (current: 0.1 Amp, electric potential: 1.0 V, and pH: 3.5) constant. The gap distance between anode and cathode varied at 5, 10, and 15 mm, while the plating time was 10, 20, and 30 minutes. Coating thickness was found to be proportional to the plating time and inversely proportional to the electrode gap distance, while the uniformity tends to improve at a large electrode gap. Empirical models of both coating thickness and uniformity were developed within the ranges of the gap distance and plating time settings, and an optimized solution was determined using these models.

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Harvey, Steven, Sandrine Ricote, David Diercks, Chun-Sheng Jiang, Neil Patki, Anthony Manerbino, Brian Gorman et Mowafak Al-Jassim. « Evolution of Copper Electrodes Fabricated by Electroless Plating on BaZr0.7Ce0.2Y0.1O3-δ Proton-Conducting Ceramic Membrane : From Deposition to Testing in Methane ». Ceramics 1, n^o 2 (2 octobre 2018) : 261–73. http://dx.doi.org/10.3390/ceramics1020021.

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We investigated copper electrodes deposited onto a BaZr0.7Ce0.2Y0.1O3-δ (BZCY72) proton-conducting membrane via a novel electroless plating method, which resulted in significantly improved performance when compared to a traditional painted copper electrode. The increased performance was examined with a multiscale multitechnique characterization method including time-of-flight secondary-ion mass spectroscopy (TOF-SIMS), transmission electron microscopy (TEM), scanning spreading-resistance microscopy (SSRM), and atom-probe tomography (APT). Through this method, we observed that a palladium catalyst layer alloys with the copper electrode. We also explored the nature of a non-coking-induced carbon-rich phase that may be involved with the improved performance of the electrode.

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Linsenmeier, R. A., et C. M. Yancey. « Improved fabrication of double-barreled recessed cathode O2 microelectrodes ». Journal of Applied Physiology 63, n^o 6 (1 décembre 1987) : 2554–57. http://dx.doi.org/10.1152/jappl.1987.63.6.2554.

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Polarographic recessed cathode gold microelectrodes are the preferred type of O2 microelectrode for tissue measurements, but the method originally described for their construction is difficult. An improved method of constructing such electrodes consists of several steps: 1) insertion of a rod made of a special low-melting point alloy into a pulled glass micropipette, 2) heating of the electrode tip as the alloy is pushed toward the tip, 3) beveling, and 4) gold plating the alloy, leaving a recess of the desired length. This method can be used to make single- or double-barreled electrodes in which the O2 barrel is as small as 2–3 micron. The electrodes retain their characteristics for several weeks.

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Humayun, Q., et U. Hashim. « A Brief Review of the Current Technologies Used for the Fabrication of Metal-Molecule-Metal Junction Electrodes ». Advanced Materials Research 626 (décembre 2012) : 867–77. http://dx.doi.org/10.4028/www.scientific.net/amr.626.867.

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Fabrication techniques for Metal-molecule-metal junction electrodes suitable to study electron tunneling through metal junctions are reviewed. The applications of current technologies such as mechanical break junction, electromigration, shadow mask lithography, focused ion beam deposition, chemical and electrochemical plating, electron-beam lithography, in fabricating vacant junction electrodes are briefly described. For biomolecular sensing applications, the size of the junction electrodes must be small enough to allow the biomolecule inserted into the junction space to connect both leads to keep the molecules in a relaxed and undistorted state. A significant advantage of using Metal-molecule-metal junction electrodes devices is that the junction can be characterized with and without the molecule in place. Any electrical artifacts introduced by the electrode fabrication process are more easily deconvoluted from the intrinsic properties of the molecule.

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Tamara, Leon Oviedo, Mikhail S. Lipkin et Mikhail V. Lukovkin. « Effect of Current Density Distribution in the Zinc Plating Process ». Solid State Phenomena 316 (avril 2021) : 839–44. http://dx.doi.org/10.4028/www.scientific.net/ssp.316.839.

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This paper presents an analysis of the current density distribution in the zinc plating process, using a two-dimension approach. The simulation presents a model based on COMSOL Multi-physics software. The simulation neglected the effect of mass transfer and production of gaseous species, in order to simplify the resolution. Additionally, a validation from the simulation through a comparison with the experimental data at similar conditions was performed. The results presented a good agreement between the experimental and simulated data. The graphics from both approaches showed a decreasing trend in the current density along the cathode length. This trend arises from the electrons movement in the electrodes; electrons flow through the least resistive path. Given the fact that zinc electroplating incurs an important industrial application, simulation is becoming a promising way to optimization and improvement.

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Hsiao, Wen-Tien, Chun-Ming Kung, Jan-Show Chu, Keng-Liang Ou et Pei-Wen Peng. « Research of Electrosurgical Ablation with Antiadhesive Functionalization on Thermal and Histopathological Effects of Brain Tissues In Vivo ». BioMed Research International 2014 (2014) : 1–8. http://dx.doi.org/10.1155/2014/182657.

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Thermal injury and tissue sticking are two major concerns in the electrosurgery. In the present study, the effect of lateral thermal injury caused by different electrosurgical electrodes on wound healing was investigated. An electrosurgical unit equipped with untreated (SS) and titanium oxide layer-coated (TiO2-coated) stainless steel needle-type electrodes was used to create lesions on the rat brain tissue. TiO2layers were produced by radiofrequency plasma and magnetron sputtering in the form of amorphous (TO-SS-1), anatase (TO-SS-2), and rutile (TO-SS-3) phase. Animals were sacrificed for evaluations at 0, 2, 7, and 28 days postoperatively. TO-SS-3 electrodes generated lower levels of sticking tissue, and the thermographs showed that the recorded highest temperature in brain tissue from the TO-SS-3 electrode was significantly lower than in the SS electrode. The total injury area of brain tissue caused by TO-SS-1 and TO-SS-3 electrodes was significantly lower than that caused by SS electrodes at each time point. The results of the present study reveal that the plating of electrodes with a TiO2film with rutile phases is an efficient method for improving the performance of electrosurgical units and should benefit wound healing.

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Scholvin, Jörg, Anthony Zorzos, Justin Kinney, Jacob Bernstein, Caroline Moore-Kochlacs, Nancy Kopell, Clifton Fonstad et Edward Boyden. « Scalable, Modular Three-Dimensional Silicon Microelectrode Assembly via Electroless Plating ». Micromachines 9, n^o 9 (30 août 2018) : 436. http://dx.doi.org/10.3390/mi9090436.

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We devised a scalable, modular strategy for microfabricated 3-D neural probe synthesis. We constructed a 3-D probe out of individual 2-D components (arrays of shanks bearing close-packed electrodes) using mechanical self-locking and self-aligning techniques, followed by electroless nickel plating to establish electrical contact between the individual parts. We detail the fabrication and assembly process and demonstrate different 3-D probe designs bearing thousands of electrode sites. We find typical self-alignment accuracy between shanks of <0.2° and demonstrate orthogonal electrical connections of 40 µm pitch, with thousands of connections formed electrochemically in parallel. The fabrication methods introduced allow the design of scalable, modular electrodes for high-density 3-D neural recording. The combination of scalable 3-D design and close-packed recording sites may support a variety of large-scale neural recording strategies for the mammalian brain.

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HOSSEINI, M. G., M. M. MOMENI et H. KHALILPUR. « SYNTHESIS AND CHARACTERIZATION OF PALLADIUM NANOPARTICLES IMMOBILIZED ON TiO2 NANOTUBES AS A NEW HIGH ACTIVE ELECTRODE FOR METHANOL ELECTRO-OXIDATION ». International Journal of Nanoscience 11, n^o 02 (avril 2012) : 1250016. http://dx.doi.org/10.1142/s0219581x12500160.

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Self-organized TiO2 nanotubes/titanium substrate modified with palladium nanoparticles ( Pd/TiO2/Ti electrodes) were prepared by a two-step process consisting of anodizing of titanium plate followed by electroless plating of palladium on resulted TiO2 nanotubes. The morphology and surface analysis of Pd/TiO2/Ti electrodes were investigated using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX), respectively. The results indicated that palladium nanoparticles were homogeneously deposited on the surface of TiO2 nanotubes. The electro-catalytic activity of Pd/TiO2/Ti electrodes in the methanol electro-oxidation was studied by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) methods. The results indicate that Pd/TiO2/Ti electrode improve the electro-catalytic activity for methanol oxidation greatly and confirmed the better electro-catalytic activity and stability of these new electrodes. So, the Pd/TiO2/Ti electrodes have a good application potential to fuel cells.

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Scott, Kimberly Y., Anna Halajko et Glenn G. Amatucci. « The Fabrication of Freestanding Heterogeneous Copper-Tin Films with Meniscus Brush Plating Electrodeposition ». Journal of New Materials for Electrochemical Systems 18, n^o 1 (17 février 2016) : 025–36. http://dx.doi.org/10.14447/jnmes.v18i1.386.

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A meniscus brush plating electrodeposition technique was utilized in conjunction with a post deposition heat treatment to formulate freestanding copper-tin alloy films for negative electrodes of lithium-ion batteries. The described fabrication technique intertwined the electrode and current collector for improved cell volume utilization and stability. Two designs were examined to establish the best diffusivity to form electrochemically proficient copper-tin alloys. Fabrication was optimized to promote diffusion of copper and tin and to form the desired intermetallic phase of Cu6Sn5. This improved design fabricated films with competitive areal capacities above 1000 mAh/cc and 2.5 mAh/cm2 for the complete electrode and current collector structure.

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Wang, Lixin, Peipei Zhang, Lei Bai, Lei Cao, Jing Du, Yazhou Wang et Xiujuan Qin. « Effects of Electrodeposition Time on Ni/rGO Composite Electrode as an Efficient Catalyst for Hydrogen Evolution Reaction in Alkaline Media ». Current Nanoscience 15, n^o 2 (14 décembre 2018) : 178–87. http://dx.doi.org/10.2174/1573413714666180405142110.

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Background: Ni/rGO composite electrode has been fabricated by facile supergravity electrodeposition as a low-cost catalyst for efficient hydrogen evolution in alkaline media. In this paper, the electrodeposition time is the main research variable. When the electrodeposition time is 100 minutes, the Ni/rGO-100 catalyst manifests the highest electrocatalytic activity toward the hydrogen evolution reaction (HER). In 1.0 M NaOH solution, the overpotential at a current density of 100 mA cm-2, Tafel slope and charge transfer resistance of Ni/rGO-100 catalyst is 184 mV, 77 mV dec-1 and 4.173 Ω, respectively. In addition, Ni/rGO-100 catalyst shows a long-term durability at a constant current density of 100 mA cm-2 for 10 h. The outstanding HER electrocatalytic performance of the Ni/rGO-100 is mainly related to the synergetic combination of Ni and rGO, as well as the enlarged exposure of catalytically active sites and improved transport of electrons arising from the good conductivity of graphene. Method: In a classic experiment, GO was prepared by modified Hummers method. The Ni/rGO composite electrodes were prepared by supergravity electrodeposition, which has been reported in detail in our published paper. Firstly, a ø10 cm × 2 cm Ni foam circle was cleaned sequentially in HCl solution (15%), acetone and DI water for 5 min with ultrasonication to be used as a cathode. And a pure nickel pipe was used as anode. The Ni/rGO composite cathodes were electrodeposited in a blackish green plating bath which contained 350 g L-1 Ni(NH2SO3)2·6H2O, 10g L-1 NiCl2·6H2O, 30 g L-1 NH4Cl , 1.0 g L-1 GO colloidal solution with different electrodeposition time, 10min, 30min, 60min, 80min, 100min, respectively. The pH value of the plating bath is 3.5-3.8. The above five electrodes were respectively denominated as Ni/rGO-10, Ni/rGO-30, Ni/rGO-60, Ni/rGO-80, Ni/rGO-100. All composite electrodes were performed under the strength of the supergravity with G=350 g at a current density of 3 A dm-2 at 318 K. Afterwards the Ni foam coated with Ni/rGO hybrid was taken out of the reaction vessel, followed by washing with deionized water to remove physical adsorption residua, and then dried at 80°C. Results: In this paper, the electrodeposition time is the main research variable. When the electrodeposition time is 100 minutes, the Ni/rGO-100 catalyst manifests the highest electrocatalytic activity toward the hydrogen evolution reaction (HER). In 1.0 M NaOH solution, the overpotential at a current density of 100 mA cm-2, Tafel slope and charge transfer resistance of Ni/rGO-100 catalyst is 184 mV, 77 mV dec-1 and 4.173 Ω, respectively. In summary, we have synthesized a class of composite electrodes (Ni/rGO) for HER in alkaline solution by electrodeposition under supergravity field. We studied the effect of electrodeposition time on electrode performance in detail. With the increase of electrodeposition time, the number of active sites is enlarged provided by the electrode. When the electrodeposition time is 100 min, we fabricate the best electrode (Ni/rGO-100). The η100, Tafel slope and charge transfer resistance of Ni/rGO-100 is 184 mV, 77 mV dec-1 and 4.173 Ω, respectively. The introduction of graphene and supergravity field plays a key role in improving the performance of the electrodes. This work is a pivotal part of the development of Ni/rGO as a non-precious HER catalyst for green energy field.

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Daud, Nurulhaidah, Nur Khairul Nabila Kamaruddin, Suraya Sulaiman et Mohd Ismahadi Syono. « Electrochemical Detection of Arsenic Using Modified Platinum-Cobalt Electrode ». International Journal of Chemical Engineering and Applications 7, n^o 4 (août 2016) : 264–68. http://dx.doi.org/10.18178/ijcea.2016.7.4.586.

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Chen, Bu Ming, Zhong Cheng Guo et Hui Huang. « Preparation and Characterization of PbO₂ on Aluminum Substrate ». Advanced Materials Research 399-401 (novembre 2011) : 50–54. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.50.

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The PbO2 film electrodes have been prepared by different electrodeposition process onto aluminum substrate.The electrochemical activity of the electrode for oxygen evolution reaction in 50g•L-1Zn2++150g•L-1H2SO4 solutions have been studied. The results show that the best activity of the electrodes obtained A1/conductive coating was electrodepositing PbO2 in alkaline lead solutions firstly, then plating PbO2 in acidic lead nitrate solutions. This can be attributed to the conductivity of the substrate, the crystal phase structure and property of PbO2. SEM-EDX analysis shows the beta-form, deposited from acidic solutions of Pb(II), has a distorted rutite structure, and the alpha-form, deposited from alkaline solutions, has the spherical cell. The high non- stoichiometry of PbO2 was obtained in alkaline lead solutions.

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Akdag, Abdurrahman, Gul Ozyilmaz et Ali Tuncay Ozyilmaz. « Poly(2-chloroaniline) and poly(aniline-co-2-chloroaniline) films on ZnFe alloy plating ». Anti-Corrosion Methods and Materials 65, n^o 6 (5 novembre 2018) : 580–86. http://dx.doi.org/10.1108/acmm-04-2018-1922.

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Purpose The purpose of this paper is to evaluate and compare the protective, anticorrosion behaviors and electrochemically synthesis of poly(2-chloroaniline) (PCANI) and poly(2-chloroaniline-co-aniline) P(CANI-co-ANI) films on thin zinc–iron plated carbon steel (CS). Design/methodology/approach Zinc–iron (ZnFe) alloy plating was successfully achieved on CS applying 3 mA constant current value. The PCANI and P(CANI-co-ANI) films on ZnFe-plated CS electrode were synthesized by cyclic voltammetry technique using monomer(s) containing 0.20 M sodium oxalate solution. The CS/ZnFe electrodes with and without PCANI or P(CANI-co-ANI) films were characterized using SEM and anodic linear sweep voltammograms. The anticorrosive behaviors of uncoated and coated electrodes were studied in 3.5 per cent NaCl solution by corrosion techniques which include open circuit potential measurements, the anodic polarization curves and alternative current electrochemical impedance spectroscopy (EIS) technique. Findings The protection efficiency values (E per cent) for CS/ZnFe, ZnCS/ZnFe/PCANI and CS/ZnFe/P(CANI-co-ANI) electrodes were calculated as 71.05, 84.53 and 92.79, respectively, after 168 h of immersion time. The results showed that P(CANI-co-ANI) coating on ZnFe-plated CS electrode exhibited higher corrosion resistance and provided better barrier property in comparison with PCANI coating and ZnFe alloy plating, in longer exposure time. Originality/value A number of reports on the synthesis and characterization of PANI have appeared in the literature during the past decade, but there is no such publication of PCANI. At the same time, the synthesis of PCANI onto the surface of metal alloy coating being the first of this kind, no such proceedings have been reported in the literature so far.

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Rue, Amy E., et Maryanne M. Collinson. « Size and Shape Control of Gold Nanodeposits in an Array of Silica Nanowells on a Gold Electrode ». International Journal of Electrochemistry 2012 (2012) : 1–9. http://dx.doi.org/10.1155/2012/971736.

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Ordered arrays of hemispherical nanowells were formed in a sol-gel-derived silica film on a gold electrode using 500 nm diameter polystyrene latex spheres as templates. The conductive domain located at the bottom of each nanowell upon template removal was enlarged via electroless deposition from a gold plating solution. The structured electrodes thus formed were characterized using scanning electron microscopy and atomic force microscopy. Depending on the method used to make the films, the extent of the long-range packing and the size of the conductive domain changed. Electroless deposition in the nanowells produced (near) sphere-like nanostructures of gold, the size of which depended on the incubation time in the plating solution and the size of the conductive domain. Longer exposure times yielded nanostructures that filled the nanowell, whereas smaller exposure time yielded much smaller structures. Significantly larger, rougher deposits were formed in nanowells with large conductive domains. The electrochemical response observed at these electrodes was strongly dependent on the extent of long-range packing, the presence of defect sites in the film and their relative spacing, and the redox species in solution.

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Chen, Tsung-Sheng, Shu-Ling Huang, Mei-Ling Chen, Tz-Jiun Tsai et Yung-Sheng Lin. « Improving Electrochemical Activity in a Semi-V-I Redox Flow Battery by Using a C–TiO2–Pd Composite Electrode ». Journal of Nanomaterials 2019 (20 janvier 2019) : 1–11. http://dx.doi.org/10.1155/2019/7460856.

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This study developed composite electrodes used in a semi-vanadium/iodine redox flow battery (semi-V-I RFB) system and designed semi-V-I RFB stacks to provide performance comparable to that of an all-vanadium redox flow battery (all-VRFB) system. These electrodes were modified using the electroless plating method and sol-gel process. The basic characteristics of the composited electrodes, such as the surface structural morphology, metal crystal phases, and electrochemical properties, were verified through cyclic voltammetry, field emission-scanning electron microscopy, energy-dispersive X-ray spectrometry, and X-ray diffraction. The results show that the sintering C–TiO2–Pd electrode improved the electrocatalytic activity of the semi-V-I RFB system, thereby effectively increasing the energy storage ability of the system. The C–TiO2–Pd electrode was used as a negative electrode in a single semi-V-I RFB and exhibited excellent cyclic performance in a charge-discharge test of 50 cycles. The average values for coulomb efficiency, voltage efficiency, and energy efficiency were approximately 96.56%, 84.12%, and 81.23%, respectively. Moreover, the semi-V-I RFB stacks were designed using series or parallel combination methods that can effectively provide the desired operating voltage and linearly increase the power capacity. The amount of vanadium salt required to fabricate the semi-V-I RFB system can be reduced by combining large stack modules of the system. Therefore, this system not only reduced costs but also exhibited potential for applications in energy storage systems.

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Soto Esquivel, María Guadalupe, Alejandro Guido Zárate, Sandra Guzman Aguirre, Adriana G. Mejía Chavez, Rolando S. García Gómez, Thalia Huanostra, Rosa Martha Padrón López et al. « Algunos aspectos interesantes de sistemas de humedales a escala de laboratorio y de banco en México ». Química Central 3, n^o 2 (27 septembre 2017) : 53–65. http://dx.doi.org/10.29166/quimica.v3i2.1206.

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Los países con economías emergentes como México, tanto desde el punto de vista económico como tecnológico encaran problemas de disposición de aguas residuales no tratadas o pobremente tratadas. Los humedales artificiales (HA) o construidos (HC) pueden representar una opción para sus comunidades rurales ya que integran procesos físicos, químicos y biológicos logrando la remoción de contaminantes presentes en las aguas residuales, pudiéndose utilizar una vez tratadas para uso agrícola o industrial. Se realizaron experimentos con reactores a escala de laboratorio y de banco para evaluar el papel que juegan las plantas acuáticas (Phragmites australis, Typha latifolia, Thalia geniculata) en la remoción de contaminantes medidos como demanda química de oxígeno soluble (DQOsoluble), conductividad eléctrica (EC), nitrógeno (N) y evaluando también potenciales de oxidación-reducción o redox (Eh), RA1,2, empleando controles sin macrofitas, RAa,b, todos empacados con escoria volcánica (i.e., tezontle en Náhuatl, la lengua azteca) con capas de diferentes granulometrías. Los reactores fueron iluminados durante 16 horas por día empleando lámparas de tubos fluorescentes con características similares a la luz natural. Ambos, los sistemas con y sin plantas se mantuvieron inundados para eliminar el ingreso de aire por convección. Se utilizó agua residual sintética preparada diariamente disolviendo sacarosa, (NH4)2SO4 y Na3PO4 con una DQOsoluble experimental promedio de 450 mg/L. Los tiempos de residencia hidráulica (TRH) de los reactores de laboratorio fueron de 0.5 y 1 días. Los reactores a escala de banco tenían valores de TRH de 14.7 y 21 d (tasas de flujo de 10 y 7L d–1). Se tomaron muestras de agua residual a la salida de cada reactor y a las profundidades de 2, 10 y 30 cm respecto al nivel del agua de los reactores para poder observar el perfil de remoción del nitrógeno (nitrógeno total Kjeldahl, NTK), la DQOsoluble, la CE y los potenciales redox, pEh,empleando metodología estandarizada para la determinación de la DQOsoluble y nitrógeno y para las medición de la CE y los pEh se emplearon electrodos comerciales. Las comunidades microbianas que proliferaban en la zona radicular fueron recolectadas al terminar los experimentos. Los métodos para su evaluación fueron: (a) Preparaciones frescas, (b) Tinción diferencial y Gram y (c) Inoculaciones en medios selectivos. Se usaron para la parte (c) dos técnicas, aislamiento por cuadrantes y extensión superficial, usando diferentes cantidades de inóculo (una muestra microbiológica con un alambre de platino para el aislamiento por cuadrantes y un volumen de muestra fijo de 0.1 mL por placa para la extensión superficial. Los cultivos fueron incubados por 24 horas a 37°C. Los resultados obtenidos indican que los reactores (RA1,2) mostraron los valores más altos para la remoción de NTK (90 y 80%), 54% para DQOsoluble y 9.3% para la CE y los valores de pEh presentaron un comportamiento oscilante a 10 cm de profundidad (en la zona radicular) para los reactores con planta demostrando el efecto fotosintético en la iluminación y oscuridad, respectivamente, comparados con los reactores control (RAa,b) sin planta (38.1% para DQOsoluble y 4.4% para CE). El análisis de los resultados indica que estas diferencias fueron estadísticamente significativas (P<0.05). Los valores de DQOsoluble y CE disminuyen a medida que la profundidad es mayor siendo mayor la remoción de ambos parámetros a la profundidad de 10 cm para el reactor con planta resaltando la importancia de la zona radicular de la planta en la eficiencia de remoción del sistema. Las comunidades microbianas con bacterias Gram (-) fueron más abundantes en la zona radicular comparadas con los reactores control a escala de laboratorio.

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Vuong, Duc-Thinh, Ha-My Hoang, Nguyen-Hung Tran et Hyun-Chul Kim. « Pulsed Electrodeposition for Copper Nanowires ». Crystals 10, n^o 3 (20 mars 2020) : 218. http://dx.doi.org/10.3390/cryst10030218.

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Copper nanowires (Cu NWs) are a promising alternative to indium tin oxide (ITO), for use as transparent conductors that exhibit comparable performance at a lower cost. Furthermore, Cu NWs are flexible, a property not possessed by ITO. However, the Cu NW-based transparent electrode has a reddish color and tends to deteriorate in ambient conditions due to the oxidation of Cu. In this paper, we propose a pulsed-current (PC) plating method to deposit nickel onto the Cu NWs in order to reduce oxidation over a 30-day period, and to minimize the sheet resistance. Additionally, the effects of the pulse current, duty cycle, and pulse frequency on the performance of the Cu–Ni (copper–nickel) NW films have also been investigated. As a result, the reddish color of the electrode was eliminated, as oxidation was completely suppressed, and the sheet resistance was reduced from 35 Ω/sq to 27 Ω/sq. However, the transmittance decreased slightly from 86% to 76% at a wavelength of 550 nm. The Cu–Ni NW electrodes also exhibited excellent long-term cycling stability after 6000 bending cycles. Our fabricated Cu–Ni electrodes were successfully applied in flexible polymer-dispersed liquid crystal smart windows.

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Kauffman, Justin, John Gilbert et Eric Paterson. « Multi-Physics Modeling of Electrochemical Deposition ». Fluids 5, n^o 4 (11 décembre 2020) : 240. http://dx.doi.org/10.3390/fluids5040240.

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Electrochemical deposition (ECD) is a common method used in the field of microelectronics to grow metallic coatings on an electrode. The deposition process occurs in an electrolyte bath where dissolved ions of the depositing material are suspended in an acid while an electric current is applied to the electrodes. The proposed computational model uses the finite volume method and the finite area method to predict copper growth on the plating surface without the use of a level set method or deforming mesh because the amount of copper layer growth is not expected to impact the fluid motion. The finite area method enables the solver to track the growth of the copper layer and uses the current density as a forcing function for an electric potential field on the plating surface. The current density at the electrolyte-plating surface interface is converged within each PISO (Pressure Implicit with Splitting Operator) loop iteration and incorporates the variance of the electrical resistance that occurs via the growth of the copper layer. This paper demonstrates the application of the finite area method for an ECD problem and additionally incorporates coupling between fluid mechanics, ionic diffusion, and electrochemistry.

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Martínez, S. A., M. G. Rodríguez et C. Barrera. « A kinetic model that describes removal of chromium VI from rinsing waters of the metal finishing industry by electrochemical processes ». Water Science and Technology 42, n^o 5-6 (1 septembre 2000) : 55–61. http://dx.doi.org/10.2166/wst.2000.0495.

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A study was made to remove Chromium VI (Cr6+), present in large quantities in the rinsing waters from the plating industry, using electrochemical treatment. Large amount of Cr6+ are found. It was found that the reaction rate followed a variable kinetic order at concentrations up to 1700 mg Cr6+/L. It was also noticed that Cr6+ reduction depended on the ferrous ions (Fe2+) released at the anode, the cathode reactions and the acidic corrosion on electrodes. Iron salts produced electrode passivation and it caused a 50% increase in treatment time and power requirements. Eliminating the salt formation at the anode could reduce this effect. Using electrochemical processes it is possible to reuse treated waters in the rising stages of the plating industry owing to the fact that final Cr6+ concentration is less than 0.5 mg/L. Finally, a sludge characterization study revealed that residue generated in the process is not considered dangerous according to Mexican environmental protection standards.

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Fan, Xiao-Yong, Pan Liu, Shan Wang, Jiaxing Han, Kefan Ni, Lei Gou, Lei Xu, Donglin Li, Chunfu Lin et Renjie Li. « Electrochemical construction and sodium storage performance of three-dimensional porous self-supported MoS2 electrodes ». Functional Materials Letters 11, n^o 03 (juin 2018) : 1850050. http://dx.doi.org/10.1142/s1793604718500509.

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Three-dimensional (3D) porous self-supported MoS2 electrodes are constructed by electrodepositing coupled with high-temperature heat treatment using 3D porous Cu prepared via electroless plating as the substrate, and directly used as anode of sodium-ion battery. The 3D porous structure can accommodate the volumetric expansion/shrinkage and alleviate the stress caused from the large volumetric changes of MoS2 electrodes during electrochemical cycling. Meanwhile, large surface area of this unique configuration enables sufficient electrode/electrolyte interaction and fast electron transportation. Besides, the influence of heat treatment temperatures on the sodium storage performance of MoS2 electrode is also investigated. The electrochemical test result shows that the 3D porous self-supported MoS2 electrode heat treated at 350[Formula: see text]C has the best electrochemical performance. It demonstrates a high first reversible capacity of 714.1[Formula: see text]mAh g[Formula: see text] at 50[Formula: see text]mA g[Formula: see text] with a high first Coulombic efficiency of 84%, and a good capacity retention of 306.8[Formula: see text]mAh g[Formula: see text] after 100 cycles at 2[Formula: see text]A g[Formula: see text]. The reversible capacity at 3.2[Formula: see text]A g[Formula: see text] shows high value of 241[Formula: see text]mAh g[Formula: see text], which is 37% of that at 0.05[Formula: see text]A g[Formula: see text].

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Popczyk, Magdalena, et B. Łosiewicz. « Effect of Sodium Hypophosphite Content in the Electroplating Bath on the Electrochemical Properties of Ni-P Alloy Coatings ». Solid State Phenomena 228 (mars 2015) : 246–51. http://dx.doi.org/10.4028/www.scientific.net/ssp.228.246.

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Porous Ni-P alloy coatings were prepared by galvanostatic electrodeposition at the deposition current density ofjdep= -250 mA cm-2from the nickel plating bath of the Watts type containing different content of sodium hypophosphite. Investigations of hydrogen evolution reaction (HER) were carried out in 5 M KOH solution at room temperature.Acimpedance behavior of the electrodes was described using electrical equivalent circuits containing two constant-phase elements (two-CPEs electrode model). The results obtained from the EIS and steady-state measurements allowed to determine the Volmer-Heyrovský mechanism and kinetics of the HER. It was found that for the Ni-P alloy coatings deposited from the galvanic baths after addition of sodium hypophosphite in the amount of 5, 10, 20 and 30 g dm-3, the decrease in their catalytic activity towards the HER is observed due to diminishing of intrinsic activity of the electrodes.

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Finegan, Donal P., Alexander Quinn, David S. Wragg, Andrew M. Colclasure, Xuekun Lu, Chun Tan, Thomas M. M. Heenan et al. « Spatial dynamics of lithiation and lithium plating during high-rate operation of graphite electrodes ». Energy & ; Environmental Science 13, n^o 8 (2020) : 2570–84. http://dx.doi.org/10.1039/d0ee01191f.

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Favorable conditions for lithium plating on graphite electrodes occur at high charge rates, causing accelerated degradation and safety concerns. A detailed map of lithiation and lithium plating dyamics is presented.

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Zhu, Zi Cai, Hua Ling Chen, Bo Li et Yong Quan Wang. « Characteristics and Elastic Modulus Evaluation of Pd-Nafion Ionic Polymer-Metal Composites ». Advanced Materials Research 97-101 (mars 2010) : 1590–94. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1590.

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Ionic polymer-metal composites (IPMCs) show great potential in a large variety of engineering fields as actuator materials. They mainly consist of electrodes and ionic polymer as the substrate material. Many metal materials can be used as the electrode material of IPMCs. In this paper palladium was adopted to get a compromise between the cost and the stability, and Pd-Nafion IPMC was fabricated by chemical plating as test sample. Preliminary experiments were accomplished with satisfactory result using a suit of self-made measurement setup. The results showed that palladium was a good electrode material. Although some previous work has investigated on the elastic modulus of IPMCs by tensile test, a simple method based on the cantilever beam theory to estimate the modulus is still proposed here, which does not need a tensile testing machine. By the method we got that the elastic modulus of the sample is 362.35MPa.

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Asadpour-Zeynali, Karim, et Fariba Mollarasouli. « Bismuth and Bismuth-Chitosan modified electrodes for determination of two synthetic food colorants by net analyte signal standard addition method ». Open Chemistry 12, n^o 6 (1 juin 2014) : 711–18. http://dx.doi.org/10.2478/s11532-014-0529-z.

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AbstractIn this paper, an electrochemical application of bismuth film modified glassy carbon electrode for azo-colorants determination was investigated. Bismuth-film electrode (BiFE) was prepared by ex-situ depositing of bismuth onto glassy carbon electrode. The plating potential was −0.78 V (vs. SCE) in a solution of 0.15 mg mL−1 Bi(III) and 0.05 mg mL−1 KBr for 180 s. In the next step, a thin film of chitosan was deposited on the surface of bismuth modified glassy carbon electrode, thus the bismuth-chitosan thin film modified glassy carbon electrode (Bi-CHIT/GCE) was fabricated and compared with bare GCE and bismuth modified GCE.Azo-colorants such as Sunset Yellow and Carmoisine were determined on these electrodes by differential pulse voltammetry. Due to overlapping peaks of Sunset Yellow and Carmoisine, simultaneous determination of them is not possible, so net analyte signal standard addition method (NASSAM) was used for this determination. The results showed that coated chitosan can enhance the bismuth film sensitivity, improve the mechanical stability without caused contamination of surface electrode. The Bi-CHIT/GC electrode behaved linearly to Sunset Yellow and Carmoisine in the concentration range of 5×10−6 to 2.38×10−4 M and 1×10−6 to 0.41×10−4 M with a detection limit of 10 µM (4.52 µg mL−1) and 10 µM (5.47 µg mL−1), respectively

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Lou, Bai Yang, Han Zhou et Bin Xu. « The Effects of Nano Pt/Carbon Black Compound Coating on the Electro-Catalysis Properties of the Graphite Electrode ». Applied Mechanics and Materials 55-57 (mai 2011) : 1774–77. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.1774.

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The modification of Nano Pt and carbon black compound coating on the fuel cell’s graphite electrode by the method of vacuum ion plating and ethanol catalytic combustion. The microstructures and the electro catalysis properties of the electrode surface before and after the modification were analyzed and tested with the methods of scanning electron microscope(SEM), transmission electron microscope(TEM), electrochemical workstation and so on. The effects of nano Pt and carbon black on the electrode’s electro catalysis properties were investigated. The Study results have shown that carrying on electrochemical properties test to the graphite electrode which has been treated with nano Pt and carbon black compound surface modification, there will be three oxidation peaks in its cyclic voltammograms and the background current will be higher. Compared with the nano Pt surface modification, the electrode which has been treated with nano Pt and carbon black compound surface modification has better ethanol electro catalysis properties. The high specific surface area acquired from the nano carbon black surface modification and the synergic action of the catalytic material Pt can improve the ethanol electro catalysis properties of the electrode effectively.

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Gladyshev, S. V., R. A. Abdulvaliev, K. O. Beisembekova et G. Sarsenbay. « Study of Gallium Plating of Metal Electrodes ». Journal of Materials Science and Chemical Engineering 01, n^o 05 (2013) : 39–42. http://dx.doi.org/10.4236/msce.2013.15008.

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Saenger, K. L., G. Costrini, D. E. Kotecki, K. T. Kwietniak et P. C. Andricacos. « Submicrometer Platinum Electrodes by Through-Mask Plating ». Journal of The Electrochemical Society 148, n^o 11 (2001) : C758. http://dx.doi.org/10.1149/1.1410971.

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Jeon, Jin Han, Il Kwon Oh, Jae Hung Han et Sun Woo Lee. « Development of Bio-Mimetic Patterned IPMC Actuators with Multiple Electrodes ». Key Engineering Materials 334-335 (mars 2007) : 1005–8. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.1005.

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The ionic-polymer-metal-composite actuators can easily actualize the bio-mimetic fish-like locomotion owing to their best merit for large deformation. And novel fabrication methods of IPMC patterned with multiple electrodes were developed to apply the different driving waves to the multiple electrodes. Generally, the IPMC actuator has been fabricated in electroless plating technique, while it is high time-consuming process, showing poor repeatability in the actuation performance due to the variables in the process of fabrication. Therefore the several fabricating methods was newly investigated by combining electroless plating, photolithography, physical sputtering and electroplating techniques capable of precisely patterning and actuating of the multiple electrodes. On the whole, four different methods were compared and analyzed in similar thickness level of Platinum electrodes. Consequently, the mixing the electroless chemical reduction and electroplating can be a promising candidate for the low time-consuming method and the better bending performance.

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Zhao, Gang, Zhuangzhi Sun, Huajun Guo, Hongshi Bi, Yan Xu et Farid Muhammad. « Effects of chemical plating time on the electromechanical properties of ionic polymer metal composites ». Journal of Polymer Engineering 36, n^o 5 (1 juillet 2016) : 449–55. http://dx.doi.org/10.1515/polyeng-2015-0300.

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Abstract The electromechanical properties of ionic polymer metal composites (IPMCs) are affected by many factors that are closely related to different physical and chemical preparation processes. This article focuses on the effects of chemical plating time on the electromechnical properties of IPMCs. First, a laminated electrode model, composed of a middle layer and a surface electrode layer, is presented in order to understand the factors affecting the electromechanical properties of IPMCs. Subsequently, the electromechanical properties were further performed by changing the chemical plating time of the polymer samples, and the impact effects were obtained by morphology characteristic analysis. The experiments revealed the mechanisms that lead to a decrease in surface electrode thickness under different chemical plating times as well as a decline in electromechanical properties.

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Zhang, Lei, Ben Liang Sun, Lin Wang, Yang Xu, Yang Li et Xin Shen. « Study of Properties of Ni-Base Nano-ZrO₂ Composite Plating Coatings ». Advanced Materials Research 239-242 (mai 2011) : 1452–56. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.1452.

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The surface of copper plate of the mold need to be reinforced to obtain the plating coatings with high hardness and corrosion resistant properties. Nowadays, Ni-base alloy coatings is used widely in the industrial production. In order to raise the service life of mold, the experiments on the property of Ni-base nano ZrO2 composite plating coatings was done in this paper. The experiments were planned with the orthogonal test design method. The effective factors on the property of coatings, bath temperature, cathode current density, the distance between two electrodes and the magnitude of Nano-ZrO2,were experimentally studied. The optimum process parameter were obtained. The results show that the composite plating layer of Ni-base Nano ZrO2 with good properties can be obtained.The optimal conditions are as follows: the bath temperature is 40 °C, cathode current density is 3A/dm2, the distance between two electrodes is 12 cm, the magnitude of Nano-ZrO2 is 12g/L. In addition binding strength of the coatings were measured quantitatively, and the structure of the plating layer were observed with SEM. The layer with good properties can be obtained in this method.

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Shin, Eun Gu, Atteq ur Rehman, Sang Hee Lee et Soo Hong Lee. « Nickel Electroless Plating : Adhesion Analysis for Mono-Type Crystalline Silicon Solar Cells ». Journal of Nanoscience and Nanotechnology 15, n^o 10 (1 octobre 2015) : 7823–27. http://dx.doi.org/10.1166/jnn.2015.11184.

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The adhesion of the front electrodes to silicon substrate is the most important parameters to be optimized. Nickel silicide which is formed by sintering process using a silicon substrate improves the mechanical and electrical properties as well as act as diffusion barrier for copper. In this experiment p-type mono-crystalline czochralski (CZ) silicon wafers having resistivity of 1.5 Ω·cm were used to study one step and two step nickel electroless plating process. POCl3 diffusion process was performed to form the emitter with the sheet resistance of 70 ohm/sq. The SiNx layer was set down as an antireflection coating (ARC) layer at emitter surface by plasma enhanced chemical vapor deposition (PECVD) process. Laser ablation process was used to open SiNx passivation layer locally for the formation of the front electrodes. Nickel was deposited by electroless plating process by one step and two step nickel electroless deposition process. The two step nickel plating was performed by applying a second nickel deposition step subsequent to the first sintering process. Furthermore, the adhesion analysis for both one step and two steps process was conducted using peel force tester (universal testing machine, H5KT) after depositing Cu contact by light induced plating (LIP).

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ONO, Yasushi, Tatsuya KAMATA, Su-Hyun KIM, Morihiro YASUDA, Akiko YOSHIYAMA, Tsutomu NONAKA et Yoshinori NISHIKI. « Preparation of Hydrophobic Platinum Electrodes by Composite-Plating ». Denki Kagaku oyobi Kogyo Butsuri Kagaku 66, n^o 7 (5 juillet 1998) : 720–26. http://dx.doi.org/10.5796/kogyobutsurikagaku.66.720.

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Nagata, Kunihiro, et Hideo Honma. « Properties of PLZT Shutter with Copper Plating Electrodes ». Japanese Journal of Applied Physics 28, S2 (1 janvier 1989) : 167. http://dx.doi.org/10.7567/jjaps.28s2.167.

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Segal, Carol C., Armond B. Chase et Albert M. Young. « High Field Pulse Plating : Gold on Platinum Electrodes ». Journal of The Electrochemical Society 139, n^o 6 (1 juin 1992) : 1580–85. http://dx.doi.org/10.1149/1.2069459.

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Hao, Feng, Ankit Verma et Partha P. Mukherjee. « Mechanistic insight into dendrite–SEI interactions for lithium metal electrodes ». Journal of Materials Chemistry A 6, n^o 40 (2018) : 19664–71. http://dx.doi.org/10.1039/c8ta07997h.

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Shiga, Tohru, Yumi Masuoka et Hiroshi Nozaki. « Observation of lithium stripping in super-concentrated electrolyte at potentials lower than regular Li stripping ». RSC Advances 11, n^o 22 (2021) : 13359–65. http://dx.doi.org/10.1039/d1ra01490k.

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When Li plating/stripping was conducted on a Cu powder electrode in a super-concentrated electrolyte of LiFSA and PNMePh, two potential plateaus of the Cu electrode for Li stripping were observed at −0.2 V and +1.0 V versus a Li counter electrode.

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Tewari, Deepti, et Partha P. Mukherjee. « Mechanistic understanding of electrochemical plating and stripping of metal electrodes ». Journal of Materials Chemistry A 7, n^o 9 (2019) : 4668–88. http://dx.doi.org/10.1039/c8ta11326b.

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Zhang, Zhenyu, Samia Said, Keenan Smith, Ye Shui Zhang, Guanjie He, Rhodri Jervis, Paul R. Shearing, Thomas S. Miller et Dan J. L. Brett. « Dendrite suppression by anode polishing in zinc-ion batteries ». Journal of Materials Chemistry A 9, n^o 27 (2021) : 15355–62. http://dx.doi.org/10.1039/d1ta02682h.

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A simple foil polishing process is demonstrated to significantly improve the electrochemical plating/stripping stability of electrodes in zinc-ion batteries, suppressing dendrite growth and prolonging cell lifetimes.

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Li, Bintian, Gang Xiao, Feng Liu, Yan Qiao, Chang Ming Li et Zhisong Lu. « A flexible humidity sensor based on silk fabrics for human respiration monitoring ». Journal of Materials Chemistry C 6, n^o 16 (2018) : 4549–54. http://dx.doi.org/10.1039/c8tc00238j.

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Xiong, Wan-Sheng, Yun Jiang, Yu Xia, Yuyang Qi, Weiwei Sun, Dan He, Yumin Liu et Xing-Zhong Zhao. « A robust 3D host for sodium metal anodes with excellent machinability and cycling stability ». Chemical Communications 54, n^o 68 (2018) : 9406–9. http://dx.doi.org/10.1039/c8cc03996h.

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A robust and ultra-stable sodium infiltrated Fe₂O₃ coated carbon textile (SFCT) anode has been designed. This SFCT anode overcomes the disadvantage of Na electrodes, which is not easily processable, and exhibits more flat voltage profiles, lower stripping/plating overpotential, and better cycling stability in an additive-free carbonate-based electrolyte compared with bare Na electrodes.

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Articles de revues sur le sujet « Electrodos de platino »

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