Relevant bibliographies by topics / Electrochemical characterizations

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

Academic literature on the topic 'Electrochemical characterizations'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Electrochemical characterizations"

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Gallegos-Melgar, Adriana, Yael González-López, Arturo Abúndez, Francisco Javier Flores-Ruiz, Juan C. Díaz-Guillén, José A. Betancourt-Cantera, Maricruz Hernández-Hernández, et al. "Characterization of a C-Based Coating Applied on an AA6063 Alloy and Developed by a Novel Electrochemical Synthesis Route." Coatings 10, no. 2 (February 5, 2020): 145. http://dx.doi.org/10.3390/coatings10020145.

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This research aimed to obtain a C-based coating electrochemically applied on an AA6063 alloy. Two electrochemical cells were designed and manufactured to obtain the C-based coating film on flat and cylindrical samples. Structural and microstructural characterizations were performed along with fatigue and corrosion performance testing. The structural and microstructural characterization revealed that the C-based coating deposited on AA6063 corresponded to carbon nanofibers and/or polycrystalline graphite. The performance testing showed an increase in fatigue life along with a decrease in corrosion resistance. The fracture surfaces of the fatigued samples were inspected by Scanning Electron Microscopy and 3D optical microscopy to correlate them with fatigue life estimation. The aforementioned process is a step towards the future development of a complete coating system that will overcome corrosion susceptibility. The carbon film obtained by this electrochemical route has not previously been reported elsewhere.
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Tomy, Ann Mary, Bhasha Sathyan, and Jobin Cyriac. "Ni(OH)2-MoS2 Nanocomposite Modified Glassy Carbon Electrode for the Detection of Dopamine and α-Lipoic Acid." Journal of The Electrochemical Society 170, no. 4 (April 1, 2023): 047506. http://dx.doi.org/10.1149/1945-7111/acc97f.

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Here, we report an electrochemical sensor realized using a nanocomposite consisting of nickel hydroxide nanosheets and exfoliated MoS2 nanosheets. The system was able to detect dopamine and α-lipoic acid in phosphate-buffered saline (PBS) solution at a pH of 7.4. The nanocomposites were characterized using microscopic and spectroscopic methods. The electrochemical characterizations were carried out using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV). It was observed that Ni(OH)2/MoS2 composite in the weight ratio of 2:1 has better results in terms of electrochemically active surface area, impedance, analytical parameters and stability. The dynamic range for dopamine detection was 0.75 − 95 μM with a LOD value of 56 nM and for α-lipoic acid, the range was 1 − 75 μM and the LOD was 51 nM.
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Kosnan, Muhammad Akmal, Mohd Asyadi Azam, Nur Ezyanie Safie, Rose Farahiyan Munawar, and Akito Takasaki. "Recent Progress of Electrode Architecture for MXene/MoS2 Supercapacitor: Preparation Methods and Characterizations." Micromachines 13, no. 11 (October 27, 2022): 1837. http://dx.doi.org/10.3390/mi13111837.

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Since their discovery, MXenes have conferred various intriguing features because of their distinctive structures. Focus has been placed on using MXenes in electrochemical energy storage including a supercapacitor showing significant and promising development. However, like other 2D materials, MXene layers unavoidably experience stacking agglomeration because of its great van der Waals forces, which causes a significant loss of electrochemically active sites. With the help of MoS2, a better MXene-based electrodecan is planned to fabricate supercapacitors with the remarkable electrochemical performance. The synthesis of MXene/MoS2 and the ground effects of supercapacitors are currently being analysed by many researchers internationally. The performance of commercial supercapacitors might be improved via electrode architecture. This analysis will support the design of MXene and MoS2 hybrid electrodes for highly effective supercapacitors. Improved electrode capacitance, voltage window and energy density are discussed in this literature study. With a focus on the most recent electrochemical performance of both MXene and MoS2-based electrodes and devices, this review summarises recent developments in materials synthesis and its characterisation. It also helps to identify the difficulties and fresh possibilities MXenes MoS2 and its hybrid heterostructure in this developing field of energy storage. Future choices for constructing supercapacitors will benefit from this review. This review examines the newest developments in MXene/MoS2 supercapacitors, primarily focusing on compiling literature from 2017 through 2022. This review also presents an overview of the design (structures), recent developments, and challenges of the emerging electrode materials, with thoughts on how well such materials function electrochemically in supercapacitors.
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Ariza, M. J., A. Cañas, and J. Benavente. "Electrokinetic and electrochemical characterizations of porous membranes." Colloids and Surfaces A: Physicochemical and Engineering Aspects 189, no. 1-3 (September 2001): 247–56. http://dx.doi.org/10.1016/s0927-7757(01)00587-8.

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Renner, M. W., A. Forman, W. Wu, C. K. Chang, and J. Fajer. "Electrochemical, theoretical and ESR characterizations of porphycenes." Journal of Inorganic Biochemistry 36, no. 3-4 (August 1989): 197. http://dx.doi.org/10.1016/0162-0134(89)84151-0.

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Chiu, Ssu-Kai, Yi-Chun Chung, Guey-Sheng Liou, and Yuhlong Oliver Su. "Electrochemical and Spectral Characterizations of 9-Phenylcarbazoles." Journal of the Chinese Chemical Society 59, no. 3 (February 20, 2012): 331–37. http://dx.doi.org/10.1002/jccs.201100601.

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Rawashdeh1, Isra, Mohamed Ghazi Al-Fandi, Yahia Makableh, and Tasneem Harahsha. "Developing a nano-biosensor for early detection of pancreatic cancer." Sensor Review 41, no. 1 (April 28, 2020): 93–100. http://dx.doi.org/10.1108/sr-01-2020-0004.

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Purpose The purpose of this paper is to report on the development of a simple electrochemical nanobiosensor for early detection of pancreatic cancer. The nanobiosensor uses the newly emerged stable micro ribonucleic acid (miR-21) as a cancer-associated biomarker for diagnosis, prognosis or therapy response. Design/methodology/approach The biosensing practice consists of two main steps: capturing probe immobilization on a working electrode modified with multi-walled carbon nanotubes and gold nanoparticles (MWCNTs-AuNPs) and then sensing the miR-21 interaction electrochemically. Two electrochemical techniques, atomic force microscopy and Fourier-transform infrared spectroscopy, were applied for characterizations. Findings The nanobiosensor sensitivity exhibited satisfying results to miR-21 and demonstrated a wide dynamic range with a detection limit of just about 3.68 femtomolar using the source measure unit (SMU). Originality/value Researchers commonly use potentiostats to perform the differential pulse voltammetry (DPV) measurements for the electrochemical biosensing applications. In this study, the SMU was used to perform the DPV to detect the biomarker miR-21 using the MWCNTs-AuNPs screen-printed electrode as the electrochemical system.
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Suleiman, Rami, Hatim Dafalla, and Bassam El Ali. "Novel hybrid epoxy silicone materials as efficient anticorrosive coatings for mild steel." RSC Advances 5, no. 49 (2015): 39155–67. http://dx.doi.org/10.1039/c5ra04500b.

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Xu, Xuelu, Jiao Zhao, Subei Bai, Rongrong Mo, Yan Yang, Weifeng Liu, Xiaojia Tang, Hang Yu, and Yimin Zhu. "Preparation of novel Ti-based MnOx electrodes by spraying method for electrochemical oxidation of Acid Red B." Water Science and Technology 80, no. 2 (July 15, 2019): 365–76. http://dx.doi.org/10.2166/wst.2019.282.

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Abstract At different calcination conditions, titanium-based manganese oxides (MnOx) electrodes were fabricated by spraying method without adhesive. The MnOx/Ti electrodes were applied in electrochemical oxidation of wastewater treatment for the first time. The surface morphologies of electrodes were tested by scanning electron microscopy. The formation of different manganese oxidation states on electrodes was confirmed by X-ray diffraction and X-ray photoelectron spectroscopy. The electrochemical properties of the electrodes have been performed by means of cyclic voltammetry and electrochemical impedance spectroscopy. The characterizations revealed that the MnOx/Ti-350(20) electrode, prepared at calcination temperature of 350 °C for 20 min, exhibited fewer cracks on the electrode surface, larger electrochemically effective surface area and lower charge transfer resistance than electrodes prepared at other calcination conditions. Moreover, Acid Red B was used as target pollutant to test the electrode activity via monitoring the concentration changes by UV spectrophotometer. The results showed that the MnOx/Ti-350(20) electrode presented the best performance on decolorization of Acid Red B with the lowest cell potential during the process of electrochemical oxidation, and the chemical oxygen demand (COD) conversion was 50.7%. Furthermore, the changes of Acid Red B during the electrochemical oxidation process were proposed by the UV–vis spectra.
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Zainul, Rahadian, Illyas Md Isa, Siti Nur Akmar Mohd Yazid, Norhayati Hashim, Sharifah Norain Mohd Sharif, Mohamad Idris Saidin, Mohamad Syahrizal Ahmad, M. Si Suyanta, and Yulkifli Amir. "Enhanced Electrochemical Sensor for Electrocatalytic Glucose Analysis in Orange Juices and Milk by the Integration of the Electron-Withdrawing Substituents on Graphene/Glassy Carbon Electrode." Journal of Analytical Methods in Chemistry 2022 (April 12, 2022): 1–15. http://dx.doi.org/10.1155/2022/5029036.

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In this work, a novel electrochemical sensor was developed by electron-withdrawing substituent modification of 1-phenyl-3-methyl-4-(4-fluorobenzoyl)-5-pyrazolone on a graphene-modified glassy carbon electrode (HPMpFP-graphene/GCE) for glucose detection. The results of characterizations using a scanning electron microscope, Fourier transform infrared spectroscopy, Raman spectroscopy, and nuclear magnetic resonance spectroscopy showed the successful fabrication of HPMpFP-graphene nanocomposite, which served as an electroactive probe for glucose detection. The electron transfer ability of HPMpFBP-graphene/GCE has been successfully revealed using cyclic voltammetry and electrochemical impedance spectroscopy results. The good electrochemical performance was shown by well-defined peak currents of square wave voltammetry under various parameters, including pH, HPMpFP and graphene composition, and scan rate effect. A high electrochemically evaluated surface area using chronoamperometry suggested that the present glucose detection response was intensified. The chronoamperometry results at a work potential of 0.4 V presented a wide linear range of 1 × 103–90 µM and 88–1 µM with 0.74 µM (S/N = 3) as the detection limit. An acceptable recovery has been revealed in the real sample analysis. The electrochemical sensing behaviour of the composite indicates that it may be a promising candidate for a glucose sensor and it significantly extends the range of applications in the electrochemical field.
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Dissertations / Theses on the topic "Electrochemical characterizations"

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Yuan, Qifan. "Physical, electrical and electrochemical characterizations of transition metal compounds for electrochemical energy storage." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/71869.

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Electrochemical energy storage has been widely used in various areas, including new energy sources, auto industry, and information technology. However, the performance of current electrochemical energy storage devices does not meet the requirements of these areas that include both high energy and power density, fast recharge time, and long lifetime. One solution to meet consumer demands is to discover new materials that can substantially enhance the performance of electrochemical energy storage devices. In this dissertation we report four transition metal materials systems with potential applications in electrochemical energy storage. Nanoscale and nanostructured materials are expected to play important roles in energy storage devices because of their enhanced and sometimes unique physical and chemical properties. Studied here is the comparative electrochemical cation insertion into a nanostructured vanadium oxide, a promising electrode material candidate, for the alkali metal ions Li+, Na+ and K+ and the organic ammonium ion, in aqueous electrolyte solutions. Observed are the distinctive insertion processes of the different ions, which yield a correlation between physical degradation of the material and a reduction of the calculated specific charge. The results reveal the potential of this nanostructured vanadium oxide material for energy storage. Vanadium based electrochemical systems are of general interest, and as models for vanadium based solid-state electrochemical processes, the solution state and the solid-state electrochemical properties of two cryolite-type compounds, (NH4)3VxGa1-xF6, and Na3VF6, are studied. The electrochemical behavior of (NH4)3VxGa1-xF6 explored the possibility of using this material as an electrolyte for solid state energy storage systems. Zeolite-like materials have large surface to volume ratios, with ions and neutral species located in the nanometer sized pores of the 3-dimensional framework, potentially yielding high energy density storage capabilities. Yet the insulating nature of known zeolite-like materials has limited their use for electrical energy storage. Studied here are two vanadium based zeolite-like structures, the oxo-vanadium arsenate [(As6V15O51)-9]∞, and the oxo-vanadium phosphate [(P6V15O51)-9]∞, where the former shows electronic conduction in the 3-dimensional framework. Mixed electronic and ionic conductivity, from the framework and from the cations located within the framework, respectively, is measured in the oxo-vanadium arsenate, and allows the use of this material in electrochemical double-layer capacitor configuration for energy storage. By contrast, the oxo-vanadium phosphate shows ionic conduction only. Lastly, a new strontium manganese vanadate with a layered structure exhibiting mixed protonic and electronic conductivity is studied. The various transition metal compounds and materials systems experimentally studied in this thesis showcase the importance of novel materials in future energy storage schemes.
Ph. D.
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Gopal, Venkatesh. "Synthesis, structural and electrochemical characterizations of new materials for li-ion batteries." Caen, 2013. http://www.theses.fr/2013CAEN2082.

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Ce travail de thèse est axée sur la découverte de nouveaux matériaux d'électrodes utilisées dans les batteries Li ou Na ion et rechargeables. Notre approche pour générer et identifier de nouveaux matériaux d'électrode à fort potentiel est basé sur la synthèse directe par chimie douce (précipitations, hydrothermale), échange d'ions et réactions électrochimiques d'oxydation/réduction. Dans le système des oxydes de vanadium, une nouvelle classe de matériau a été synthétisé avec la formule générale AVO3 (avec A = Li, Na, Ag, Cu). Dans le cas du lithium, nous avons observé la formation d’une nouvelle phase Li2VO3 de structure NaCl désordonnée délivrant une capacité spécifique réversible de 250 mAh/g à un potentiel moyen de 2,5 V vs Li/Li+. Un autre nouveau matériau d'électrode à base de phosphate de vanadium Na2VO(HPO4)2 a été préparé par échange ionique à partir du phosphate acide de vanadium VO(H2PO4)2. Ce composé est un conducteur ionique ( = 10-3S/cm à 200°C) et livré une capacité spécifique de 70 mAh/g à tension plus élevée ~ 3,9 V vs Li/Li+ avec une excellente réversibilité. A la recherche de nouvelles compositions dans le système Li-M-O, nous avons synthétisé la nouvelle phase Li5W2O7 à partir de la phase en ruban Li2W2O7 par insertion électrochimique de lithium. Cette phase présente une structure de type NaCl ordonnée et un comportement électrochimique attrayant avec une capacité spécifique initiale de 162 mAh/g. Nous avons étudié également la phase Ag2W2O7 iso-structurale qui offre quant à elle une capacité de 193 mAh/g
This thesis work is focused on the discovery of new electrode materials used in rechargeable lithium and sodium ion batteries. Our approach to generate and identify new high potential electrode materials is based on direct soft chemistry synthesis (precipitation, hydrothermal), ion exchange and electrochemical oxidation/reduction reactions. In the A-V-O system (A=Li, Na, Ag, Cu), a new class of material has been synthesized by lithium/sodium insertion with the general formula A2VO3. We found that the fully reduced phase Li2VO3 is showing a disordered rock-salt-type structure and delivered a reversible specific capacity of 250 mAh/g at an average potential of 2. 5 V vs. Li+/Li. Another candidate Li5W2O7 has been explored as new electrode material for Li-ion batteries in the A-W-O system. Starting from the ribbon-type structure Li2W2O7, the fully reduced phase Li5W2O7 is showing an ordered rock-salt-type structure and the electrochemical behavior of these new phases is attractive with an initial specific capacity of 162 mAh/g. We studied also the iso-structural phase Ag2W2O7 and it delivers a capacity of 193 mAh/g. Another new electrode material based on vanadium phosphate Na2VO(HPO4)2 has been prepared by ion exchange method starting from the acidic vanadium phosphate VO(H2PO4)2. This compound is an ionic conductor (=10-3S/cm at 200°C) and delivered a specific capacity of 70 mAh/g at higher voltage ~3. 9 V vs. Li/Li+ with an excellent reversibility
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Liu, Juan. "Electrochemical Characterizations and Theoretical Simulations of Transport Behaviors at Nanoscale Geometries and Interfaces." Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/chemistry_diss/74.

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Since single nanopores were firstly proposed as a potential rapid and low-cost tool for DNA sequencing in 1990s (PNAS, 1996, 93, 13770), extensive studies on both biological and synthetic nanopores and nanochannels have been reported. Nanochannel based stochastic sensing at single molecular level has been widely reported through the detection of transient ionic current changes induced by geometry blockage due to analytes translocation. Novel properties, including ion current rectification (ICR), memristive and memcapacitive behaviors were reported. These fundamental properties of nanochannels arise from the nanoscale dimensions and enables applications not only in single molecule sensing, but also in drug delivery, electrochemical energy conversion, concentration enrichment and separation, nanoprecipitation, nanoelectronics etc. Electrostatic interactions at nanometer-scale between the fixed surface charges and mobile charges in solution play major roles in those applications due to high surface to volume ratio. However, the knowledge of surface charge density (SCD) at nanometer scale is inaccessible within nanoconfinement and often extrapolated from bulk planar values. The determination of SCD at nanometer scale is urgently needed for the interpretation of aforementioned phenomena. This dissertation mainly focuses on the determination of SCD confined at a nanoscale device with known geometry via combined electroanalytical measurements and theoretical simulation. The measured currents through charged nanodevices are different for potentials with the same amplitude but opposite polarities, which deviates away from linear Ohm's behavior, known as ICR. Through theoretical simulation of experiments by solving Poisson and Nernst-Planck equations, the SCD within nanoconfinement is directly quantified for the first time. An exponential gradient SCD is introduced on the interior surface of a conical nanopre based on the gradient distribution of applied electric field. The physical origin is proposed based on the facilitated deprotonation of surface functional groups by the applied electric field. The two parameters that describe the non-uniform SCD distribution: maximum SCD and distribution length are determined by fitting high- and low-conductivity current respectively. The model is validated and applied successfully for quantification and prediction of mass transport behavior in different electrolyte solutions. Furthermore, because the surface charge distribution, the transport behaviors are intrinsicaly heterogeneous at nanometer scale, the concept is extended to noninvasively determine the surface modification efficacy of individual nanopore devices. Preliminary results of single molecule sensing based on streptavidin-iminobiotin are included. The pH dependent binding affinity of streptavidin-iminobiotin binding is confirmed by different current change signals ("steps" and "spikes") observed at different pHs. Qualitative concentration and potential dependence have been established. The chemically modified nanopores are demonstrated to be reusable through regenerating binding surface.
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Kim, Youngseok. "Characterizations of alloying Cu effect on electrochemical reactions of Al-Cu solid solution alloys." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1143130451.

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Venot, Timothée. "Matériaux optiques actifs en couches minces : élaboration et caractérisation de systèmes tout-solides électrochromes à émissivité infrarouge variable." Thesis, Tours, 2014. http://www.theses.fr/2014TOUR4006.

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Les dispositifs électrochromes sont des dispositifs qui permettent de moduler la réflexion ou la transmission de la lumière. Ils recouvrent une grande variété d’applications dans le domaine du visible (vitrages intelligents) et dans le domaine de l’infrarouge (protection thermique des satellites et discrétion optique infrarouge). Les travaux présentés dans ce manuscrit répondent essentiellement à une problématique visant à élaborer un dispositif électrochrome tout solide à émissivité infrarouge variable par un procédé unique de pulvérisation cathodique magnétron. Une nouvelle architecture d’empilement avec une électrode de travail monocouche bi fonctionnelle a été choisie pour réunir les propriétés apportées classiquement par deux couches ou plus sur le haut des empilements électrochromes. Cette nouvelle architecture a nécessité la mise en place d’un procédé de dépôt original de pulvérisation cathodique réactive hydratée. Ce procédé a permis d’obtenir une électrode monocouche à base de trioxyde de tungstène réunissant les propriétés optiques et électroniques souhaitées. Il a également permis de déposer les autres couches de l’empilement, la contre-électrode à base de trioxyde de tungstène et les électrolytes solides conducteurs protoniques à base d’oxyde de tantale ou de zirconium. L’étude de l’ajout d’une couche d’encapsulation à base de dioxyde de cérium a également été menée. Cette architecture a permis d’obtenir un empilement électrochrome tout solide fonctionnel. Ce dispositif complet ainsi élaboré présente de bonnes propriétés optiques dans l’infrarouge en terme de modulation d’émissivité dans les bandes spectrales d’intérêt, à savoir 13 % en bande II et 31 % en bande III
Electrochromic materials are devices for modulating the reflection or transmission of light. They cover a wide variety of applications in the visible range (smart windows) and the infrared range (thermal protection for satellites and optical infrared discretion). The works presented in this manuscript were essentially responding to the problem of developping an all solid electrochromic device with a variable infrared emissivity by a single process of magnetron sputtering. A new stacking architecture with a working bi functional monolayer electrode was chosen to bring the properties conventionally made by two or more layers on top of electrochromic device. This new architecture has required the establishment of an original deposit process of hydrated reactive sputtering. This process yielded a monolayer electrode based on tungsten trioxide combining the desired optical and electronic properties. It allowed to deposit other layers of the stack, the counter electrode based on tungsten trioxide and the proton conductive solid electrolyte based on tantalum or zirconium oxide. The study of the addition of an encapsulation layer based on cerium dioxide was also conducted. This architecture has resulted in a functional all-solid electrochromic stack. The complete device thus prepared exhibits good optical properties in the infrared emissivity in terms of modulation and in particular in the spectral bands of interest, namely 13 % in MW and 31 % in LW
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Adonisi, Thobeka. "Electrochemical characterization of platinum based." Thesis, University of the Western Cape, 2012. http://hdl.handle.net/11394/3801.

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Fuel cells convert chemical energy from a fuel into electricity through chemical reaction with oxygen. This possesses some challenges like slow oxygen reduction reaction (ORR), overpotential, and methanol fuel cross over in a direct methanol fuel cell (DMFC). These challenges cause inefficiency and use of higher amounts of the expensive platinum catalyst. Several binary catalysts with better ORR activity have been reported. In this study we investigate the best catalyst with better ORR and MOR performances and lower over-potentials for PEMFC and DMFC applications by comparing the in-house catalysts (10%Pt/C, 20%Pt/C, 30%Pt15%Ru/C, 40%Pt20%Ru/C, 30%PtCo/C, 20%Pt20%Cu/C and 20%PtSn/C) with the commercial platinum based catalysts (10%Pt/C, 20%Pt/C, 20%Pt10%Ru/C, 20%PtCo/C, 20%PtCu/C and 20%PtSn/C) using the cyclic voltammetry and the rotating disk electrode to determine their oxygen reduction reaction and methanol tolerance. HRTEM and XRD techniques were used to determine their particle size, arrangement and the atomic composition. It was observed that the 20%Pt/C in-house catalyst gave the best ORR activity and higher methanol oxidation current peaks compared to others catalysts followed by 20%Pt10%Ru/C commercial catalyst. The 20%PtCo/C commercial, 30%PtCo/C in-house and 20%PtSn/C in-house catalysts were found to be the most methanol tolerant catalysts making them the best catalysts for ORR in DMFC. It was observed that the ORR activity of 20%PtCo/C commercial and 30%PtCo/C inhouse catalysts were enhanced when heat treated at 350 0C. From XRD and HRTEM studies, the particle sizes were between 2.72nm to 5.02nm with little agglomeration but after the heat treatment, the particles were nicely dispersed on the carbon support.
>Magister Scientiae - MSc
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Wasala, KWM Milinda Prabath. "ELECTROCHEMICAL CHARACTERIZATION OF EXFOLIATED GRAPHENE." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1418.

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In this research we have investigated electrochemical and impedance characteristics of liquid phase exfoliated graphene electrodes. The exfoliated graphene electrodes were characterized in Electrochemical Double Layer Capacitors (EDLCs) geometry. Liquid phase exfoliation was performed on bulk graphite powder in order to produces few layer graphene flakes in large quantities. The exfoliation processes produced few layer graphene based materials with increased specific surface area and were found to have suitable electrochemical charge storage capacities. Electrochemical evaluation and performance of exfoliated graphene electrodes were tested with Cyclic Voltammetry, constant current charging discharging and Electrochemical Impedance Spectroscopy (EIS) at ambient conditions. We have used several electrolytes in order to evaluate the effect of electrolyte in charge storage capacities. Specific capacitance value of ~ 47F/g and ~ 262F/g was measured for aqueous and ionic electrolytes respectively. These values are at least an order of magnitude higher than those obtained by using EDLC's electrodes fabricated with the bulk graphite powder. In addition these EDLC electrodes give consistently good performance over a wide range of scan rates and voltage windows. These encouraging results illustrate the exciting potential for high performance electrical energy storage devices based on liquid phase exfoliated graphene electrodes.
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Wagner, Mary Elizabeth S. B. Massachusetts Institute of Technology. "Advanced electrochemical characterization of copper deposition." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/110960.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, February 2016.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 51-52).
The electrodeposition of copper metal in a concentrated sulfuric acid solution is reported to occur through a four-step mechanism: (I) the dehydration of Cu2+ (H2O)6, (II) the reduction of Cu2+ to cu+, (III) the dehydration cu+ (H2O)6-x, (IV) the reduction of Cu+ to copper metal. The dehydration steps have been found to be responsible for the pH-dependence of the electrodeposition reaction. It is also reported, although not well understood, that the presence of Fe2+ ions affects the reaction kinetics. In this work, the kinetics of copper electrodeposition were studied using alternating current cyclic voltammetry. The reaction was studied at a copper rotating disk electrode with varying concentrations of Cu2+ and Fe2+ . At sufficiently low pH, and a sufficiently high concentration of Fe2+ , the deposition kinetics may be slowed enough to separately observe the two electron transfer steps involved in copper reduction. It was found that Fe2+ ions affect the electrodeposition kinetic by slowing down reaction kinetics, particularly the second electron transfer reaction.
by Mary Elizabeth Wagner.
S.B.
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Brown, Craig J. "Characterization of a parallel plate electrochemical reactor." Thesis, University of Southampton, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358040.

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Huang, Jimin. "Characterization of Electrochemical Interfaces by INfrared Spectroscopy." Diss., Virginia Tech, 1996. http://hdl.handle.net/10919/30301.

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The properties of electrochemical interfaces are studied using Fourier transform infrared spectroscopy. Potential difference infrared spectroscopy (PDIRS) was used in the investigation of carbon monoxide adsorbed on polycrystalline platinum electrodes. It is found that the infrared peak position of adsorbed carbon monoxide is linearly dependent on the applied electrode potential, and that the Stark tuning rate is a function of system temperature. The change in Stark tuning rate is the result of the variation of the interfacial dielectric constant with temperature. Self-assembled alkoxyalkanethiol monolayers were formed on gold substrates as surface modifiers of low dielectric constant designed to influence the interfacial capacitance. Polarization modulation infrared spectroscopy (PMIRS), ellipsometry, interfacial wetting, and cyclic voltammetry were conducted to characterize the modified interfaces. The interfacial capacitance is greatly reduced due to the adsorption of w-mercapto ethers on substrates. It was found that the solvation of the monolayer by solution is capable of improving the mass transport to maintain the Faradaic current while lowering the interfacial capacitance. The oxygen group in w-mercapto ethers at the monolayer-water interface interacts with water molecules to improve the monolayer solubility in water. The w-mercapto ether monolayers were found to be fluid-like in structure, giving better freedom to undergo structural change. The repulsion from the oxygen atoms in adjacent w-mercapto ether molecules adsorbed on the substrate introduces structural disorder to the alkyl chains in the monolayer, allowing better solvent permeation. This relieves some of the current blocking character of long chain alkanethiol monolayers. The interfacial contact angle to water for the w-mercapto ether monolayers is dependent on the oxygen position in the monolayer. 12-Methoxydodecanethiol has the lowest contact angle among all the w-mercapto ethers studied while 12-butoxydodecanethiol through 12-hexoxydodecanethiol have similar contact angles due to the ether oxygen being buried beneath several layers of methylene groups. The film thickness is roughly proportional to the total number of methylene groups in the two alkyl chains on w- mercapto ethers. w-Mercapto ethers that have a longer alkyl chain between the oxygen and thiol tend to form thicker monolayers on the substrates. In situ PMIRS measurements show that w-mercapto ether monolayers do not undergo structural change in the alkyl chains when in contact with either water or acetonitrile. The terminal methyl group, however, suffers from a shift in infrared peak position to lower frequency, and a decrease in peak height as the result of solvent load.
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Books on the topic "Electrochemical characterizations"

1

György, Inzelt, Scholz Fritz, and SpringerLink (Online service), eds. Electrochemical Dictionary. 2nd ed. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

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1936-, Varma Ravi, Selman J. R, and Electrochemical Society, eds. Techniques for characterization of electrodes and electrochemical processes. New York: Wiley, 1991.

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N, Kumta Prashant, and American Ceramic Society Meeting, eds. Processing and characterization of electrochemical materials and devices. Westerville, Ohio: American Ceramic Society, 2000.

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D, Abruña Héctor, ed. Electrochemical interfaces: Modern techniques for in-situ interface characterization. New York: VCH Pub., 1991.

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Lvovich, Vadim. Electrochemical impedance spectroscopy (EIS) characterization of electrorheological fluids (ERF). Norwich, N.Y.]: Knovel, 2011.

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Russell, Sebastian T. The synthesis, characterization, and electrochemical analysis of structured polymer electrolytes having strong ionic interactions. [New York, N.Y.?]: [publisher not identified], 2020.

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C, Hansen D., Isaacs H. S. 1936-, Sieradzki Karl, Electrochemical Society Corrosion Division, Electrochemical Society Electrodeposition Division, and Electrochemical Society. Physical Electrochemistry Division., eds. Scanning probe techniques for materials characterization at nanometer scale: Proceedings of the international symposium. Pennington, NJ: Electrochemical Society, 2001.

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Pern, F. J. Characterization of damp-heat degradation of CuInGaSe₂ solar cell components and devices by (electrochemical) impedance spectroscopy: Preprint. Golden, CO: National Renewable Energy Laboratory, 2011.

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Eroglu, Damla. Modeling and Characterization of Rate Phenomena in Complex Electrochemical Systems: Sodium-Metal Chloride Batteries and Ni/SiC Co-Deposition. [New York, N.Y.?]: [publisher not identified], 2013.

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ALTEC 2003 (2003 Paris, France). Analytical and diagnostic techniques for semiconductor materials, devices, and processes: Joint proceedings of symposia on: ALTEC 2003 : Analytical techniques for semiconductor materials and process characterization IV : Paris, France ; and the 202nd Meeting of the Electrochemical Society : Diagnostic techniques for semiconductor materials and devices VI : Salt Lake City, Utah. Edited by Kolbesen Bernd O, Electrochemical Society Electronics Division, Electrochemical Society Meeting, Electrochemical Society Meeting, Society of Photo-optical Instrumentation Engineers, and Symposium on Diagnostic Techniques for Semiconductor Materials and Devices (6th : 2002 : Salt Lake City, Utah). Pennington, N.J: Electrochemical Society, 2003.

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Book chapters on the topic "Electrochemical characterizations"

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Khan, Kamrul Alam, Md Siddikur Rahman, Md Nafeez Rahman, Saleh Ahmad Khan, Md Tarikul Islam Juel, and Mohua Islam Nirjhar. "A Study on Electrochemical Characterizations of Bryophyllum pinnatum Leaf Electricity." In Lecture Notes in Bioengineering, 567–81. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6915-3_54.

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Janetaisong, Pathompong, Ratchatee Techapiesancharoenkij, and Yuttanant Boonyongmaneerat. "Microstructural and Corrosion Characterizations of Nickel-Titanium Coatings Produced by Electrochemical Codeposition and Heat Treatment." In PRICM, 2075–82. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118792148.ch257.

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Janetaisong, Pathompong, Ratchatee Techapiesancharoenkij, and Yuttanant Boonyongmaneerat. "Microstructural and Corrosion Characterizations of Nickel-Titanium Coatings Produced by Electrochemical Codeposition and Heat Treatment." In Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing, 2075–82. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-48764-9_257.

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Hameed, Abdulrahman Shahul. "Physicochemical and Electrochemical Characterization." In Phosphate Based Cathodes and Reduced Graphene Oxide Composite Anodes for Energy Storage Applications, 31–45. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2302-6_2.

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Mofokeng, Tladi Gideon, Mpho Phillip Motloung, Onoyivwe Monday Ama, and Suprakas Sinha Ray. "Electrochemical Characterization of Nanomaterials." In Modified Nanomaterials for Environmental Applications, 11–24. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85555-0_2.

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Herpich, Max, Jochen Friedl, and Ulrich Stimming. "Scanning Electrochemical Potential Microscopy (SECPM) and Electrochemical STM (EC-STM)." In Surface Science Tools for Nanomaterials Characterization, 1–67. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44551-8_1.

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Schuhmann, Wolfgang, Denis Öhl, and Dulce M. Morales. "Operando Electrochemical Raman Spectroscopy." In Springer Handbook of Advanced Catalyst Characterization, 189–211. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-07125-6_9.

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Ortiz Ortega, Euth, Hamed Hosseinian, Ingrid Berenice Aguilar Meza, Andrea Rodríguez Vera, María José Rosales López, and Samira Hosseini. "Characterization Techniques for Electrochemical Analysis." In Material Characterization Techniques and Applications, 195–220. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9569-8_7.

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Varazo, Kris, Travis L. Wade, Billy H. Flowers, Marcus D. Lay, Uwe Happek, and John L. Stickney. "Morphology in Electrochemical Atomic Layer Epitaxy." In Thin Films: Preparation, Characterization, Applications, 83–93. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-0775-8_6.

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Bustos, Erika, Juan Manríquez, Juan Manuel Peralta-Hernández, and Edgar J. Ruiz-Ruiz. "Electrochemical Characterization of Photocatalytic Materials." In Photocatalytic Semiconductors, 155–85. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10999-2_5.

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Conference papers on the topic "Electrochemical characterizations"

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Muthamizh, S., S. Praveen Kumar, S. Munusamy, and V. Narayanan. "MnMoO4 nanolayers : Synthesis characterizations and electrochemical detection of QA." In DAE SOLID STATE PHYSICS SYMPOSIUM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5028744.

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Chen, Feng, Hongfei Yao, Ping Fan, Jintao Yang, and Mingqiang Zhong. "The characterizations and electrochemical properties of lignosulfonate templates based mesoporous NiO." In POWDERS AND GRAINS 2013: Proceedings of the 7th International Conference on Micromechanics of Granular Media. AIP, 2013. http://dx.doi.org/10.1063/1.4811882.

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Hussain, Mohamed A., and Fuad M. Khoshnaw. "Electrochemical migration of electronic components at sea environments - characterizations and solutions." In 2008 IEEE 9th VLSI Packaging Workshop of Japan. IEEE, 2008. http://dx.doi.org/10.1109/vpwj.2008.4762223.

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Koussi-Daoud, Sana, and Thierry Pauporté. "Electrochemical deposition and characterizations of adherent NiO porous films for photovoltaic applications." In SPIE OPTO, edited by Ferechteh H. Teherani, David C. Look, and David J. Rogers. SPIE, 2015. http://dx.doi.org/10.1117/12.2175921.

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Min, Zheng, Yingjie Wu, Kailai Yang, Jin Xu, Sarwesh Narayan Parbat, and Minking K. Chyu. "Dimensional Characterizations Using SEM and Surface Improvement With Electrochemical Polishing of Additively Manufactured Microchannels." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14842.

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Abstract MicroChannel manufacturing is one of the fastest-growing areas in advanced manufacturing with numerous applications, including turbine blade cooling structures, compact microchannel heat exchangers, and electronic cooling devices. Recent development of metallic additive manufacturing based on direct metal laser sintering technology is capable of fabricating micro-scale structures with high complexity and design flexibility. However, powder bed laser sintering process produces rough surface characteristics caused by hatch overlaps and particle attachments, leading to channel size reductions and rough surfaces. In this paper, dimensional metrology of cross-sectional views of multi-row microchannels made by additive manufacturing was conducted by a scanning electron microscope at different locations along the printing direction. Channel size reduction, surface roughness and circularity tolerance of the as-printed channels were analyzed based on micrographs captured by SEM. Results showed that both channel sizes and hole pitches affected the printing qualities of microchannels. The as-printed channel sizes reduced by more than 15% compared to the designed values. Two approaches were made in this paper to improve printing qualities. The first one was to redesign channel size in CAD model to make the as-printed channel sizes closer to the objective values. Electrochemical polishing was then applied as a second way using sulfuric acid solutions. Surface roughness value was reduced by more than 40% after the ECP process.
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F. ABD, Marwa, F. F. SAYYID, and Sami I. Jaafar AL-RUBAIEY. "CHARACTERIZATIONS OF PRECIPITATED ZINC PRODUCED BY DEZINCIFICATION OF BRASS WASTE IN HCL SOLUTION." In VI.International Scientific Congress of Pure,Applied and Technological Sciences. Rimar Academy, 2022. http://dx.doi.org/10.47832/minarcongress6-12.

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Dezincification is the selective corrosion of zinc in brass that leaves the copper behind and does not result in the full dissolving of the brass followed by copper redeposition. Both procedures may occur under different conditions. This work investigated the influence of concentration and applied potential on the characteristics of zinc powder (purity, apparent density, morphology, particle size distribution, and particle zeta potential) produced by the electrochemical process from waste brass. In the electrochemical process, we used hydrochloric acid HCl in three different concentrations (0.1, 0.2, and 0.3) M. The time of the electrochemical process was 30 min, and the distance between poles was 3cm for all experiments, With the pH scale of all solutions equal to 1. The voltages that were used were (1, 1.5, 2, 2.5, and 3) V. We made Fifteen experiments were conducted to obtain the best result for the highest solubility of zinc ion in an electrolyte. Atomic absorption spectrometry (AAS) analysis was used to determine the concentration of Cu++ and Zn++ ions that deposited in the electrolyte after electrodeposition, with the highest value of Zn obtained being 1500 ppm for a concentration of 0.3 M HCl in 1 V, rather than 736, 454 for 0.2 M in 2 V, and 0.1 M in 2.5 V, respectively. After knowing the most solutions that contain zinc ions by examining the AAS. We take the solutions and re-deposition them electrically using graphite electrodes for a period of 25 minutes, where the zinc is deposited on the graphite electrode in the form of silver-colored layers tilted to light gray. This precipitate is then scraped off on filter paper and weighed to determine the apparent density. In graphite cathode, the apparent density ranged from (0.89 - 0.42) gm./cm3 in 0.3M, (0.69 - 0.34) gm./cm3 in 0.2M, and (0.55 - 0.24) gm/cm3 in 0.1M. All results showed that the morphology of zinc powder analyzed by SEM was dendritic and mossy. purity of zinc produced were determined by XRF analysis for different concentrations, that increase with increased the concentration and applied potential from 1 to 3 V, the high value of purity of Zinc powder was %98.58 in 1V and 0.3M concentration for graphite cathode.
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Chakraborty, Rajib, Susmita Datta, Mohammad Shahid Raza, and Partha Saha. "Improvement of Ionic Bonding Strength and Electrochemical Corrosion Resistance of Hydroxyapatite- Calcium Phosphate Pulsed Electrochemically Deposited In-Situ Coating Through Hydroxyl Ion Treatment." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6582.

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Hydroxyl ion treatment of different hydroxyapatite-calcium hydrogen phosphate composite in-situ coatings synthesized through pulsed electro-deposition with varying amount of hydroxyapatite phase and degree of crystallinity were carried out with the help of highly basic solution in order to achieve a more chemically stable and corrosion resistance performance under contact with body fluid. The coatings exhibit altogether completely different behaviour in terms of bond formation, surface topography generation, phase transformation and corrosion behaviour. Detailed characterizations of formed top surface layer were carried out with the help of XRD, SEM and FTIR in order to correlate the results with their base surface characteristics. Transformation of <020> and <121> surface parallel planes of calcium hydrogen phosphate in to <002> and <112> planes of hydroxyapatite took place in all the coatings along with formation of nano-crystalline structure. Calcium-rich porous hydroxyapatite scaffold formation takes place in low current density coating which in general exhibits low stability in terms of chemical bonding strength vis-à-vis corrosion protection performance. 10 mA/cm2 coating, which come with optimum presence of hydroxyapatite phase and crystallinity post electro-deposition, showed significant improvement in terms of increasing hydroxyl and phosphate bond polarization strength of hydroxyapatite phase and the same lead to improvement in the overall corrosion resistance performance of the coating by two times. Despite of formation of highest amount of hydroxyapatite phase during hydroxyl ion treatment in 20 mA/cm2 coatings, the corrosion protection performance results are negative on account of dilution of mostly low bonding amorphous phases with high internal residual stress.
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Gerard, Mathias, Jean-Philippe Poirot-Crouvezier, Daniel Hissel, and Marie-Cecile Pe´ra. "Ripple Current Effects on PEMFC Ageing Test by Experimental and Modeling." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33174.

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PEMFCs’ systems usually require power conditioning by a DC/DC boost converter to increase the output fuel cell voltage, especially for automotive applications and stationary applications. The output fuel cell current is then submitted to the high frequency switching leading to a current ripple. The ripple current effects on fuel cell are studied by experimental ripple current ageing test on a 5 cell stack (MEA surface of 220 cm2) and compare to a reference ageing test. The stack is run in nominal conditions but an AC component is added to the DC current load. The AC component is a 5 kHz triangle which amplitude is ±20% of the DC component in order to simulate a boost waveform. Fuel cell characterizations (polarization curves, impedance spectra and voltammetry) provide information on the PEMFC ageing and the performance evolution. Local conditions are computed through a dynamic stack model. The model takes into account transport phenomena, heat transfer, and semi-empirical electrochemical reactions and includes a meshing to calculate local conditions on the MEA surface (gas reactant pressures, local temperature, gas molar fractions, water activity, and local electronic current density). The consequences about performance and ageing during high frequency ripple current are explained.
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Guang Ma, Zhiguo Ye, Xin Chen, and Yu Han. "The electrochemical characterization of electrochemically synthesized MnO2-based mixed oxides for supercapacitor." In 2010 International Conference on Power System Technology - (POWERCON 2010). IEEE, 2010. http://dx.doi.org/10.1109/powercon.2010.5666737.

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West, Michael. "Controlling Copper Electrochemical Deposition (ECD)." In CHARACTERIZATION AND METROLOGY FOR ULSI TECHNOLOGY: 2003 International Conference on Characterization and Metrology for ULSI Technology. AIP, 2003. http://dx.doi.org/10.1063/1.1622519.

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Reports on the topic "Electrochemical characterizations"

1

Park, Su-Moon. Electrochemical characterization and derivatization of coal. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/5514100.

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Gu, J., Z. Zhu, and M. Tomkiewicz. Electrochemical characterization of grouted radioactive waste. Office of Scientific and Technical Information (OSTI), November 1993. http://dx.doi.org/10.2172/10185405.

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Park, Su-Moon. Electrochemical characterization and derivatization of coal. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/5514100.

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Barnaby, Hugh J. Characterization and Physics-Based Modeling of Electrochemical Memristors. Fort Belvoir, VA: Defense Technical Information Center, November 2015. http://dx.doi.org/10.21236/ada627598.

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Downer, Nancy W., Jianguo Li, Leslie W. DeLuca, Elizabeth M. Penniman, and H. G. Smith. Surface-Bound Alkyl Monolayers: Electrochemical and Structural Characterization. Fort Belvoir, VA: Defense Technical Information Center, June 1991. http://dx.doi.org/10.21236/ada237604.

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Downer, Nancy W., Jianguo Li, Elizabeth M. Penniman, and H. G. Smith. Surface-Bound Biomembranes Incorporating Receptors: Electrochemical and Structural Characterization. Fort Belvoir, VA: Defense Technical Information Center, June 1991. http://dx.doi.org/10.21236/ada237605.

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Krebs, L. C., and Takanobu Ishida. Characterization of electrochemically modified polycrystalline platinum surfaces. Office of Scientific and Technical Information (OSTI), December 1991. http://dx.doi.org/10.2172/5974973.

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Krebs, Leonard C., and Takanobu Ishida. Characterization of electrochemically modified polycrystalline platinum surfaces. Office of Scientific and Technical Information (OSTI), December 1991. http://dx.doi.org/10.2172/10112590.

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Bierwagen, Gordon, Douglas J. Mills, D. Tallman, and B. Skerry. Characterization of Corrosion under Marine Coatings by Electrochemical Noise Methods. Fort Belvoir, VA: Defense Technical Information Center, August 1994. http://dx.doi.org/10.21236/ada327348.

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Wright, R. B., and T. C. Murphy. Characterization of carbon-based electrochemical capacitor technology from Maxwell Energy Products, Inc. Office of Scientific and Technical Information (OSTI), April 1998. http://dx.doi.org/10.2172/666284.

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