Relevant bibliographies by topics / Electrodos de platino

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Electrodos de platino'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "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, no. 1 (April 20, 2016): 3. http://dx.doi.org/10.18845/tm.v29i1.2534.

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<p class="p1">Se evaluaron tres diferentes métodos de deposición de estaño en platino policristalino (Pt <em>pc</em>) desde una solución de ácido sulfúrico utilizando técnicas electroquímicas convencionales, con el fin de determinar y comparar su influencia en la oxidación de metanol. </p><p class="p1">Los métodos probados fueron deposición espontánea, deposición a subpotenciales y deposición cíclica a subpotenciales. El estaño fue depositado desde una solución de SnSO<span class="s1">4 </span>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. </p><p class="p1">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. </p>
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Abadía López, Julieth, Claudia L. Pérez Valdés, and Mario Grajales Tamayo. "Electroquímica de Oro en Ácido Clorhídrico." Revista de Ciencias 13 (September 4, 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, and Marisela Segura-Osorio. "ECOFARMACOVIGILANCIA Y LA DETERMINACIÓN DEL DICLOFENACO SÓDICO MEDIANTE ELECTROANÁLISIS." CIENCIA UNEMI 12, no. 31 (September 26, 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, and Walter Estrada. "FABRICACIÓN DE ELECTRODOS NANOESTRUCTURADOS DE ZnO PARA APLICACIONES FOTOVOLTAICAS." Revista Cientifica TECNIA 23, no. 2 (March 13, 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, and E. J. Woo. "Highly precise nanofiber web-based dry electrodes for vital signal monitoring." RSC Advances 6, no. 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, and Xiao Li. "The Study on Electrocatalysis Properties of Pt / Co Coated Graphite Electrode." Key Engineering Materials 474-476 (April 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, and 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, no. 2 (December 6, 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, and Sung Hwa Bae. "Effect of Plating Layers on the Bonding Strength of p-Type Bi–Te Thermoelectric Elements." Journal of Nanoscience and Nanotechnology 21, no. 8 (August 1, 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, and 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, and Linda F. Nazar. "Elastic and Li-ion–percolating hybrid membrane stabilizes Li metal plating." Proceedings of the National Academy of Sciences 115, no. 49 (November 19, 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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Dissertations / Theses on the topic "Electrodos de platino"

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Arán-Ais, Rosa M. "Interfacial reactivity: model surfaces and tailored shape-controlled nanocatalysts." Doctoral thesis, Universidad de Alicante, 2016. http://hdl.handle.net/10045/70091.

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El trabajo realizado en esta tesis ha seguido dos líneas de investigación principales: por un lado, el uso de electrodos monocristalinos de Pt ha permitido realizar estudios fundamentales de la interfase electrodo│disolución, así como de la electrocatálisis de moléculas orgánicas simples (C2) bifuncionalizadas, y por otro lado, el efecto que la estructura superficial ejerce sobre la electrocatálisis de ciertas reacciones se ha aplicado a la síntesis y caracterización de nanopartículas de Pt con forma controlada. Este campo se ha ampliado al estudio de nanocatalizadores bimetálicos y trimetálicos para la ORR. El estudio que aquí se presenta ha profundizado en el conocimiento sobre las relaciones que hay entre estructura superficial – actividad – y estabilidad morfológica y composicional de electrocatalizadores basados en Pt destinados a PEMFCs.
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Myedi, Noluthando. "Electrochemical kinetics and sensing of conjugated dienes in acetonitrile." University of the Western Cape, 2011. http://hdl.handle.net/11394/5424.

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>Magister Scientiae - MSc
This thesis focuses on the electroanalysis of some dienes (2-methyl-1.3-butadiene (MBD), tran-1.3-pentadiene (PD), 1.3-cyclohexadiene (CHD) and 3-cyclooctadiene (COD)) found in gasoline and the development of simple electrochemical diene sensors. The detection of dienes in fuels is important as they readily polymerise and form gum in fuel tanks. The electroctivity of the dienes was studied with glassy carbon electrode (GCE) and Pt electrode in tetrabutylammonium perchlorate (TBAP)/acetonitrile solution. Polyaniline-polystyrene sulfonic acid (PANi-PSSA) composite films were electro-deposited or drop-coated on GCE, with and without gold nanoparticles (AuNPs) and characterized by cyclic voltammetry (CV), high resolution transmission electron microscopy (HRTEM) and ultraviolet-visible (UV-vis) spectroscopy. Both composite polymers were found to be of nanofibral structure, and the spherical gold nanoparticles were dispersed uniformly within the polymer. The dienes exhibited no redox peaks on GCE/PANi-PSSA and GCE/PANi-PSSA/AuNPs electrode systems from -1.0 V to +1.5 V, beyond which PANi would overoxidize and lose its electroactivity. Therefore, cyclic voltammetry and steady state amperometry of the four dienes (MBD, PD, CHD and COD) were studied with unmodified Pt and GCE electrodes. Subtractively normalised interfacial-fourier transform infra-red (SNIFTIR) spectroscopic studies of the dienes were performed with Pt electrode. SNIFTIR data showed that there was a definite electro-oxidation of 1.3-cyclohexadiene as electrode potential was changed from E = 770 mV to E = 1638 mV. Severe electrode fouling was observed when steady state amperometric detection of CHD, as a representative diene, was performed on Pt electrode. Randel-Sevčik analysis of the CVs of the dienes on Pt electrode gave diffusion coefficient (Dox) values of 10.65 cm²/s, 9.55 cm²/s, 3.20 cm²/s and 3.96 cm²/s for CHD, COD, PD, and MBD, respectively. The corresponding detection limits (3σn-1) were 0.0106 M, 0.0111 M, 0.0109 M, and 0.0107 M.
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Briega-Martos, Valentín. "Unraveling the oxygen reduction reaction mechanism: occurrence of a bifurcation point before hydrogen peroxide formation." Doctoral thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10045/102311.

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En la presente tesis doctoral se realiza un estudio detallado sobre el mecanismo de la reacción de reducción de oxígeno (ORR) en electrodos monocristalinos de platino. Para ello, se han realizado medidas electroquímicas usando la configuración de electrodo rotatorio de menisco colgante (HMRDE) con superficies con distinta estructura superficial y variando condiciones de la disolución de trabajo como el pH, fuerza iónica o la ausencia o presencia de bromuros. La conclusión principal que se extra de estos experimentos es la posibilidad de la existencia de un punto de bifurcación en el mecanismo, implicando el intermedio OOH, antes de la formación de peróxido de hidrógeno. Además, también se estudia la ORR y la reacción de oxidación de ácido fórmico en electrodos monocristalinos de Pt en presencia de acetonitrilo, como estudio previo al estudio de estas reacciones en disolventes orgánicos con pequeñas cantidades de agua. Por último, se estudia la ORR en un Aza-CMP, lo cual permite obtener información fundamental que se puede aplicar en estudios sobre el mecanismo de la ORR en los sitios activos de materiales de carbón funcionalizados con nitrógeno.
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Khanfar, Mohammad F. "Molybdenum-modified platinum electrodes /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,160874.

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Koda, Ryo. "Electrochemical deposition of metal on microporous silicon electrodes influenced by hydration structures of solutes and electrode surfaces." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199323.

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Morimoto, Yu. "Electrochemical oxidation of methanol on platinum and platinum based electrodes." Case Western Reserve University School of Graduate Studies / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1058206604.

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Rudge, Andrew John. "The photoelectrochemistry of platinum." Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358597.

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Aixill, W. Joanne. "Electrode processes." Thesis, University of Oxford, 1998. http://ora.ox.ac.uk/objects/uuid:9578fd22-42fe-41cc-9d92-96f8272956d8.

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The work presented in this thesis first characterises a high speed channel flow cell and then applies the system to the electro-reduction of nitromethane in aqueous solution. Potential step transient measurements are carried out with the current-time transients simulated using a model based on the absence of axial diffusion. The excellent agreement between theory and experiment confirms the proposed mass transport model and further demonstrates that the combination of current-time transients recorded using the high speed channel flow cell and numerical simulations provide a powerful tool to access homogeneous rate constants of the order 1 x 106s̄¹. The high speed channel flow cell is then used in combination with a range of complementary electrochemical techniques, numerical modelling, in-situ ESR, single crystal experiments and kinetic isotope measurements to infer a mechanistic scheme for the complex electro-reduction pathway of nitromethane in aqueous solution. Platinum, gold, mercury/copper and mercury/gold electrodes are investigated enabling the most conclusive description of the reduction mechanism to date. The reaction pathway is shown to follow an ECEEE type process with the chemical step proceeding at the electrode surface. The heterogeneous rate constant, khet, describing the chemical step is calculated for each electrode surface. For platinum in the pH range 7.0 - 9.0 this value is 0.3 ± 0.06 cm s̄¹. For mercury/copper it is 0.18 cm s̄¹, for gold/mercury it is 0.06 cm s̄¹ and for Au it is 0.095 cm s̄¹. Consideration of these values shows a surprising independence of the heterogeneous rate constant on the chemical identity of the surface with all of the values being similar to within less than an order of magnitude. The reason for the apparent paradox of the observed surface indifference of the chemical reaction step is explained by a homogeneous H transfer from the carbon to the oxygen of the nitromethane radical anion, formed form the initial electron transfer step, occurring in the layer of solution immediately adjacent to the electrode solution as shown in the scheme below. The resulting species, •CH2 N(OH))ˉ then undergoes a rapid irreversible adsorption to the electrode surface and subsequent transformation to the final product the hydroxylamine, CH3NHOH. It is proposed that if the energy barrier to the adsorption of •CH2 N(OH))ˉ is less than that required for the H atom transfer then the reaction rate will be insensitive to the adsorption step and hence the chemical identity of the electrode. This introduces the concept of a whole new electrochemical process: the surface indifferent electrocatalytic reaction.
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Jayaratna, Husantha G. "Stripping/plating analysis at carbon and metallic interdigitated electrodes /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487848078449337.

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Pegg, David John. "Structural and chemical promotion of platinum electrodes." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242320.

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Books on the topic "Electrodos de platino"

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Zahm, Lance Leon. Nuclear investigations of the eletrolysis of D₂O using palladium cathodes and platinum anodes. 1990.

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van Houselt, Arie, and Harold J. W. Zandvliet. Self-organizing atom chains. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.013.9.

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This article examines the intriguing physical properties of nanowires, with particular emphasis on self-organizing atom chains. It begins with an overview of the one-dimensional free electron model and some interesting phenomena of one-dimensional electron systems. It derives an expression for the 1D density of states, which exhibits a singularity at the bottom of the band and extends the free-electron model, taking into consideration a weak periodic potential that is induced by the lattice. It also describes the electrostatic interactions between the electrons and goes on to discuss two interesting features of 1D systems: the quantization of conductance and Peierls instability. Finally, the article presents the experimental results of a nearly ideal one-dimensional system, namely self-organizing platinum atom chains on a Ge(001) surface, focusing on their formation, quantum confinement between the Pt chains and the occurrence of a Peierls transition within the chains.
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Book chapters on the topic "Electrodos de platino"

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Cuesta, Ángel, and Claudio Gutiérrez. "CO Adsorption on Platinum Electrodes." In Catalysis in Electrochemistry, 339–73. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929421.ch10.

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Vidaver, W., and S. Swenson. "O2 Exchange Measurement Using a Platinum Polarographic Electrode." In Modern Methods of Plant Analysis, 41–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83346-5_3.

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Fuentes, M. C., I. Ayerdi, and F. J. Gracia. "Topological and Electrical Analysis of Flexible Platinum Electrodes on Biocompatible PDMS Substrates." In IFMBE Proceedings, 1342–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23508-5_346.

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van der Klink, J. J. "Beyond Electrons in a Box: Nanoparticles of Silver, Platinum and Rhodium." In Novel NMR and EPR techniques, 209–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-32627-8_8.

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Guenther, Thomas, M. Schuettler, J. S. Ordonez, C. Henle, J. Wilde, and T. Stieglitz. "A Novel Interconnection Technology for Laser-Structured Platinum Silicone Electrode Arrays." In IFMBE Proceedings, 2392–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89208-3_574.

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Henle, C., W. Meier, M. Schuettler, T. Boretius, and T. Stieglitz. "Electrical Characterization of Platinum, Stainless Steel and Platinum/Iridium as Electrode Materials for a New Neural Interface." In IFMBE Proceedings, 100–103. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03889-1_27.

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Love, B., and J. Lipkowski. "Effect of Surface Crystallography on Electrocatalytic Oxidation of Carbon Monoxide on Platinum Electrodes." In ACS Symposium Series, 484–96. Washington, DC: American Chemical Society, 1988. http://dx.doi.org/10.1021/bk-1988-0378.ch033.

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Rodriguez, René R., Wade J. Tornquist, Francis Guillaume, and Gregory L. Griffin. "Vibrational Spectroscopic Studies of Adsorbate Competition During Carbon Monoxide Adsorption on Platinum Electrodes." In ACS Symposium Series, 369–82. Washington, DC: American Chemical Society, 1988. http://dx.doi.org/10.1021/bk-1988-0378.ch025.

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Oh, B. S., S. Y. Park, Y. J. Jung, K. W. Baek, T. M. Hwang, Kyoo Sung Cho, and J. W. Kang. "Application of Platinum and Titanium Materials as an Electrode for Hygiene Purpose." In Materials Science Forum, 199–202. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-431-6.199.

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Chen, Li Wen, Chia Yen Lee, Chien Hsiung Tsai, and Yung Chuan Chen. "Thermal Contact Residual Stress Analysis of Elastic-Plastic Bilayer Micro-Cantilevers with Platinum Electrodes." In Materials Science Forum, 559–64. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-990-3.559.

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Conference papers on the topic "Electrodos de platino"

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Bennett, Matthew D., and Donald J. Leo. "A Co-Reduction Process for Plating Ionic Polymer Transducers With Precious and Non-Precious Metal Electrodes." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39007.

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A co-reduction process is developed for plating ionic polymer materials with precious and non-precious metal electrodes. The purpose is to develop a process that reduces the use of expensive precious metals such as platinum and gold in the development of ionic polymer transducers. Previous results by Bennett and Leo (1) have demonstrated that oxidation is the key issue associated with the use of non-precious metal electrodes. The present work overcomes this problem through the use of a co-reduction process in which an alloy of platinum and copper is deposited in an impregnation/reduction process. A thin (~50 nm) layer of gold is then deposited to increase the surface conductivity of the electrode. Actuators developed using this process are tested for longevity for approximately 250,000 cycles. The results demonstrate the stability of the electrode, although multiple tests reveal that variations in the process produce variations in the electrode stability.
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Parekh, Mihir, and Christopher Rahn. "Dendrite Suppression and Energy Density in Metal Batteries With Electrolyte Flow Through Perforated Electrodes." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23487.

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Abstract Previous research shows that forced advection through porous lithium metal electrodes can eliminate dendrite growth in lithium metal batteries. In this paper, we study the effect of creeping electrolyte flow through perforated metal anodes on dendrite growth and energy density by using a 2D COMSOL Multiphysics model. The flowing electrolyte enhances plating inside the slot (2D model of pore) and reduces plating on the part of electrode directly facing the counter-electrode. This reduces the chances of short circuit via dendrite growth. Higher electrolyte velocity reduces the plating current density in the inter-slot gap and increases the amount of plating in the slot. Larger slot separation and thicker electrodes alleviate dendrite growth but lower the specific charge density. Wider slots enhance the possibility of short circuits and narrower slots may get plugged due to plating inside the hole. Thus, slot width, slot separation, and electrode thickness should be optimized to ensure high specific charge density and non-dendritic plating in the inter-slot gap.
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Tsugawa, Marissa A., Kam K. Leang, Viljar Palmre, and Kwang J. Kim. "Sectored Tube-Shaped Ionic Polymer-Metal Composite Actuator With Integrated Sensor." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3017.

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This paper describes the development of a tube-shaped ionic polymer-metal composite (IPMC) actuator with sectored electrodes and an integrated resistive strain-based displacement sensor. Tube or cylindrical shaped IPMC actuators, with the ability to provide multiple degrees-of-freedom motion, can be used to create active catheter biomedical devices and novel bio-inspired propulsion mechanisms for underwater autonomous systems. An experimental tube-shaped IPMC actuator is manufactured from a 40-mm long Nafion polymer tube with inner diameter of 1.3 mm and outer diameter of 1.6 mm. The outer surface of the tube-shaped structure is plated with platinum metal via an electroless plating process. The platinum electrode on the tube’s outer surface is sectored into four isolated electrodes using a simple surface milling technique. A custom-designed strain sensor comprised of 50 AWG ni-chrome wire is developed and attached to the tube’s surface to sense the bending motion of the tube actuator. The integrated sensor is low cost and practical, and it avoids the need for bulky external sensors such as lasers for measuring deflection and feedback control. Preliminary experimental results are presented to demonstrate the performance of the IPMC tube actuator and integrated displacement sensor.
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Huda, Nazmul, and Prashanta Dutta. "Platinum Microelectrodes in Polymeric Microfluidic Chips: A New Fabrication Approach." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14066.

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Platinum microelectrodes become essential components in microfluidic devices for separation, pumping, sensing, and other bio-analyses. Due to their chemical inertness, several research groups have developed microfluidic devices with integrated platinum electrodes on silicon, quartz, or glass substrates. However, no techniques have been reported so far for depositing platinum electrodes in polymeric microchannels. In this study, a novel fabrication scheme for forming integrated microelectrodes in a poly-dimethyl-siloxane (PDMS) microchip is described. The electrode fabrication technique consists of photolithography, thermal processing, sequential sputtering of titanium and platinum and stripping off photoresist, while soft-lithography is used to form the microfluidic channels on PDMS. This approach facilitates precise positioning of the electrodes with a micron-sized gap between them, and it can be used for both low and high aspect ratio channels. The platinum electrodes, formed on the PDMS channel surface, demonstrated very good interfacial adhesion with the substrate due to the use of a very thin titanium layer between the platinum and PDMS. The surface roughness of the electrodes was found around ±50 nm.
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Beck, Joseph R., Daniel F. Walczyk, Casey J. Hoffman, and Steve J. Buelte. "Ultrasonic Bonding of Membrane Electrode Assemblies for Low Temperature PEM Fuel Cells." In ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2012 6th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fuelcell2012-91308.

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Ultrasonic bonding of low temperature PEM membrane electrode assemblies has shown to cut the cycle time and energy input of manufacturing by over an order of magnitude each as compared to the industry standard of thermal pressing. Ultrasonic bonding uses high-frequency mechanical oscillations to convert electrical energy into heat energy which bonds the membrane electrode assembly components. This reduction in manufacturing resource requirement and time helps make fuel cell energy more economical as an alternative electrical power source. This paper will discuss ultrasonic and thermal bonding for low temperature Nafion fuel cells with 10 cm2 active area including process optimization and the effects of electrode type and membrane conditioning on ultrasonically bonded MEA performance. A design set of experiments was created for both ultrasonic bonding and thermal pressing process optimization using commercially available electrodes and conditioned Nafion 115 membrane. Analysis of Variance suggests that neither energy nor pressure have a statistically significant effect on the performance on ultrasonically bonded MEAs. For thermally pressed MEAs, temperature was found to have a significant effect on performance while pressure was not. Neither manufacturing technique found interaction effects to be statistically significant. Three different electrode compositions were tested on both ultrasonic and thermal MEA bonding methods. Electrodes investigated include two that were custom made in-house with catalyst loadings of 0.16 and 0.33 mg Pt/cm2, and one commercial electrode with 0.5 mg Pt/cm2. The lower loaded custom electrode had greater performance than the commercial electrode, which had higher platinum loading, indicating electrode architecture is an important factor in the performance of ultrasonically bonded MEAs. Membrane electrode assemblies made using Nafion membranes that were pretreated with a conditioning process showed decreased performance compared to MEAs ultrasonically bonded from dry, unconditioned membrane in short-term testing. MEAs thermally pressed with the custom made electrodes performed better with conditioned membranes while the commercial electrodes showed decreased performance with conditioning. Current electrodes have been optimized for thermal pressing as demonstrated by the two commercial electrodes having the largest performance decreases between thermally and ultrasonically manufactured MEAs. Future work includes intelligently designing an electrode for optimizing the ultrasonic bonding process for low temperature fuel cells to increase the performance of this manufacturing technique.
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Hoffman, Casey J., and Daniel F. Walczyk. "Direct Spraying of Catalyst Inks for PEMFC Electrode Manufacturing." In ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/fuelcell2011-54416.

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Automated manufacturing techniques are needed to reduce production costs for polymer electrolyte membrane (PEM) fuel cell electrodes. The work presented in this paper focuses on the use of a low pressure, low volume direct spray valve that uses air pressure to atomize fluids and transfer them to a gas diffusion layer (GDL) to produce a gas diffusion electrode (GDE). Two of these electrodes would then be joined with a polymer electrolyte membrane to produce a fuel cell membrane electrode assembly (MEA). Accurate and reproducible deposition methods such as this will result in less wasted materials, especially platinum, and increased throughput compared to common laboratory-scale techniques such as paint brushing and Mayer-rod coating. In this study, the production of inks will be discussed including a catalyst ink containing platinum nano-particles supported on carbon (20% loading by weight) and a similar analog ink which is identical except for that it does not contain the platinum. Two different substrates, mylar transparency film and actual carbon paper GDL substrate will be used and presented in this study. Ink rheology (viscosity, solids content, etc.) will also be discussed as it pertains to optimizing spray pattern uniformity and process efficiency. Initial results of thickness measurements which are used for determining uniformity and the required overlapping of multiple coats will be presented. In addition, a comparison of scanning electron microscopy (SEM) images of electrode surface structures prepared by mayer-rod and spraying will be shown. A brief discussion of the future work planned by the authors in order to study the effects of processing variables on actual fuel cell performance will also be given.
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Agonafer, Damena D., Edward Chainani, Muhammed E. Oruc, Ki Sung Lee, and Mark A. Shannon. "Study of Alkane Thiols as a Blocking Mechanism for Specific Adsorption for Application of Charge Selective Membrane Transport." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64678.

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Electrodialysis (ED) is an electrochemical process used for separation of ions across perm-selective membranes. ED uses a DC bias to selectively transport ions across membranes for applications ranging from desalination of water to demineralization of fruit juice. The energy cost of ED is due to accumulation of hydroxide and hydronium ions from the electrochemical process of water; additionally there is the cost of using platinum electrodes. This paper addresses the idea of using polycarbonate track etched membrane (PCTE) coated with gold between the membranes to reduce the energy cost and to explore a wider selection of electrode materials. This paper aims to show how thiol monolayers on gold can be used as ideal polarizable electrodes (electrode behaves like a capacitor with only charging current and no faradaic current) for application of potential to the membrane surface double layer. We report the characterization of such monolayers on gold-coated microscope slides. The goal is to control the diffuse layer potential at each membrane-solution interface while at the same time prevent adsorption on the electrode surface and minimize Faradaic activity due to electrolyte and redox species in solution. This lays the groundwork for the application of thiol-modified polycarbonate track-etched membranes for ion-selective transport. The paper proposes the use of electrochemical impedance spectroscopy (EIS) to measure characteristics of gold (Au)-coated membranes and their inherent limitations. In this work, the fabrication of a membrane permeate flow cell is described with the aim of subsequently studying the transport of ions through conductive polycarbonate track etched membrane (PCTE) by interrogating the system using EIS and CV measurements. In particular, we would like to ascertain the voltage range that can be applied to the Au-coated membrane without getting a considerable faradaic activity; the difference between platinum and Au electrode; the effects of different electrolyte concentrations and various applied DC potentials.
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Fuerth, D., and A. Bazylak. "Carbon Based Electrodes for Upscaling Microfluidic Fuel Cells." In ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2012 6th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fuelcell2012-91043.

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In this work, we present an experimental microfluidic fuel cell with a novel up-scaled porous electrode architecture that provides higher overall power output compared to conventional microfluidic fuel cells and a methodology for electrode material evaluation to inform designs for improved performance. Our proof-of-concept architecture is an up-scaled version of a previously presented flow-through cell with more than nine times the active electrode surface area. We employed 0.04M formic acid and 0.01M potassium permanganate as fuel and oxidant, respectively, dissolved in a 1M sulfuric acid electrolyte. Platinum black was employed as the catalyst for both anode and cathode. Carbon based porous electrodes including felt, cloth, fibre, and foam were compared to traditional Toray carbon paper in order to characterize their respective performances. We also discussed current densities normalized by electrode volume, which is appropriate for comparison of flow-through architectures. The traditional method of current normalization by projected electrode surface area is also presented.
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Shin, Dong Ho, Joon Shik Yoon, and Han Seo Ko. "Development of Efficient Water Purifier by Cavitation Nozzle With Electrode." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-16320.

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Water is a limited and vital resource, so it should not be wasted by pollution. A development of new water purification technology is urgent nowadays since the original and biological treatments are not sufficient. And, they have some disadvantages such as sludge. Thus, the detailed experimental data about the development of the water purifier with a cavitation nozzle (venturi-type tube) and electrodes using an electrochemical technology, so called electrolysis were analyzed in this study. Two platinum-coated titanium meshes were used as electrodes, and DC voltage was supplied on the electrodes. Optimum electrode interval and applied power were determined for the electrolysis of indigo carmine solutions. And then, the optimized electrodes were installed in the venturi-type tube for generating cavitation. The cavitation effect of water could be enhanced by the bubbly flow induced by the electrolysis of the electrodes without any byproduct. Finally, the prototype of the water purifier with the electrodes and the cavitation nozzle was developed, and its advantages for the purification and removal of algal bloom were confirmed. As a result, the energy saving and high efficient water purifier was fabricated in this study.
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Fultz, Derek W., and Po-Ya Abel Chuang. "The Effect of Catalyst Coated Diffusion Media on PEM Fuel Cell Performance." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11597.

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Two fuel cell architectures, differing only by the surfaces onto which the electrodes were applied, have been analyzed to determine the root causes of dissimilarities in performance. The basic proton exchange membrane fuel cell (PEMFC) is comprised of the proton transporting membrane, platinum-containing anode and cathode electrodes, porous carbon fiber gas diffusion media (GDM), and flow fields which deliver the reactant hydrogen and air flows. As no optimal cell design currently exists, there is a degree of latitude regarding component assembly and structure. Catalyst coated diffusion media (CCDM) refers to a cell architecture option where the electrode layers are coated on the GDM layers and then hot-pressed to the membrane. Catalyst coated membrane (CCM) refers to an architecture where the electrodes are transferred directly onto the membrane. A cell with CCDM architecture has tightly bonded interfaces throughout the assembly which can result in lower thermal and electrical contact resistances. Considering the fuel cell as a 1-D thermal system, the through-plane thermal resistance was observed to decrease by 5–10% when comparing CCDM to CCM architectures. This suggests the thermal contact resistance at the electrode interfaces was significantly reduced in the hot-press process. In addition, the electrical contact resistances between the electrode and GDM were observed to be significantly reduced with a CCDM architecture. This study shows that these effects, which have a potential to increase performance, can be attributed to the hot-press lamination process and use of CCDM architecture.
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Reports on the topic "Electrodos de platino"

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Ervin, Matthew H., and Brian Isaacson. Same-Side Platinum Electrodes for Metal Assisted Etching of Porous Silicon. Fort Belvoir, VA: Defense Technical Information Center, November 2015. http://dx.doi.org/10.21236/ada623559.

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Gilman, Sol. Coulometric Study of Ethanol Adsorption at a Polycrystalline Platinum Electrode. Fort Belvoir, VA: Defense Technical Information Center, July 2011. http://dx.doi.org/10.21236/ada549237.

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Gilman, Sol. Coulometric Study of Acetate Adsorption at a Polycrystalline Platinum Electrode. Fort Belvoir, VA: Defense Technical Information Center, August 2011. http://dx.doi.org/10.21236/ada550005.

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Fukuoka, Yuko, Makoto Uchida, and Yasushi Sugawara. Preparation method of ultra low platinum loading electrodes for polymer electrolyte fuel cells. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/460306.

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Korzeniewski, C., B. S. Pons, P. P. Schmidt, and M. W. Severson. An analysis of the Vibrational Spectrum of Carbon Monoxide on Platinum Metal Electrodes. Fort Belvoir, VA: Defense Technical Information Center, October 1986. http://dx.doi.org/10.21236/ada173366.

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Danielson, M. J. The effect of gamma radiation on reference electrodes and platinum and carbon steel bare metal electrodes in a simulated waste solution. Final report. Office of Scientific and Technical Information (OSTI), September 1993. http://dx.doi.org/10.2172/10185450.

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Hu Lin Li, D. H. Robertson, J. Q. Chambers, and D. T. Hobbs. Electrochemical reduction of nitrate and nitrite in concentrated sodium hydroxide at platinum and nickel electrodes. Office of Scientific and Technical Information (OSTI), October 1996. http://dx.doi.org/10.2172/385582.

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Gilman, Sol. Coulometric Study of Rates of Oxalic Acid Adsorption at a Polycrystalline Platinum Electrode. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada570408.

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Ayers, Katherine, Christopher Capuano, Plamen Atanassov, Sanjeev Mukerjee, and Michael Hickner. High Performance Platinum Group Metal Free Membrane Electrode Assemblies through Control of Interfacial Processes. Office of Scientific and Technical Information (OSTI), November 2017. http://dx.doi.org/10.2172/1410560.

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Samant, Mahesh G., Keiji Kunimatsu, Hajime Seki, and Michael R. Philpott. In Situ FTIR Study of the Adsorption Geometry of Bisulfate Ions on a Platinum Electrode. Fort Belvoir, VA: Defense Technical Information Center, January 1990. http://dx.doi.org/10.21236/ada229793.

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