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Articles 2191 - 2220 of 2389
Full-Text Articles in Chemistry
Study On The Oxygen Electrodes Of Alkaline Fuel Cells Effect Of Dopant On The Activity Of Ag/C Catalyst, Jiawei Teng, Linhua Jin, Luncheng Tang
Study On The Oxygen Electrodes Of Alkaline Fuel Cells Effect Of Dopant On The Activity Of Ag/C Catalyst, Jiawei Teng, Linhua Jin, Luncheng Tang
Journal of Electrochemistry
A new kind of nonnoble catalyst for the oxygen electrodes of Alkaline Fuel Cells was investigated. The AgNiBiHg/C catalyst, which was prepared by chemical reduction, was active for the cathodic reduction of oxygen in alkaline fuel cells. It was found that the catalytic activity was improved by adding Ni, Bi, Hg to Ag/C catalyst, and the maximum activity was observed at Ag50%-Ni2%-Bi3%-Hg3%-C42%(wt%). XRD inconjunction with SEM indicated that the crystalline silver turned into amorphous in the presence of doping agents and the grain size of silver was reduced. No dramatic deactivation of the catalyst occured after 5200 hours of service.
Development Of A New Type Ni-S Evolution Hydrogen Electrode For Water Electrolysis, Xiaoyou Yuan, Jinyu Wang
Development Of A New Type Ni-S Evolution Hydrogen Electrode For Water Electrolysis, Xiaoyou Yuan, Jinyu Wang
Journal of Electrochemistry
A new type evolution hydrogen electrode NiS(N) has been made from nickel plating electrode in NiSO4CS(NH2)2 bath by electrodeposition. It is analyzed by SEM and X-ray energy spectrum. The NiS(N) electrode is different from the NiS(O) electrode (which is used in plant at present time) in surface metallograph configuration and surfer content. The results of measurement polarization curves and water electrolysis 480 hours at 5 000 A·m-2 show that the evolution hydrogen overpotential of NiS(N) electrode is decreased at least 160 mV relative to NiS(O) electrode and the stablisum of NiS(N) electrode is better …
Effect Of Addition Groups On The Redox Properties Of Fullerenes, Louzhen Fan, Yongfang Li, Dagui Zheng, Yuliang Li, Daoben Zhu
Effect Of Addition Groups On The Redox Properties Of Fullerenes, Louzhen Fan, Yongfang Li, Dagui Zheng, Yuliang Li, Daoben Zhu
Journal of Electrochemistry
Electrochemical properties of fullerene derivatives, including five C60 derivatives and four C70 derivatives, were studied systematically and comparatively by cyclic voltammetry and differential pulse wave voltammetry. The addition of the electron-donating groups on the fullerenes caused negative shift of the redox potentials of the fullerenes. The extent of the negative shift depends on the number and properties of the addition groups, and on the nature of the fullerenes. 0.08～0.20 V negative shift was observed for C60 and C70 monoadducts, 0.30～0.32 V for bisadduct and 0.53～0.58 V for triadduct of C60. Meanwhile, the oxidation waves …
Li/Α-Sn(Hpo4)2 Cell And Its Reaction Mechanism, Yuan Lin, Runliang Cai, Haoqing Wu
Li/Α-Sn(Hpo4)2 Cell And Its Reaction Mechanism, Yuan Lin, Runliang Cai, Haoqing Wu
Journal of Electrochemistry
The discharge mechanism of Li/α-Sn(HPO4)2 cell has been investigated by means of X-ray diffraction, XPS and cyclic voltammetry methodes. It has been shown that the electrochemical intercalation reation exists in the cathode material. There is a new phase after some degree of intercalation. With potential step and galvanostatic techniques, the chemical diffusion cofficients of Li+ in LixSn(HPO4)2 is estimated to be 10-12～10-13 cm2·s-1.
Electrical Potential Distribution Around A Charged Colloidal Particle: Nonlinear Integral Equation, Yongxian Qian, Hao Deng, Guangzheng Yang
Electrical Potential Distribution Around A Charged Colloidal Particle: Nonlinear Integral Equation, Yongxian Qian, Hao Deng, Guangzheng Yang
Journal of Electrochemistry
The electrical potential distribution around a charged colloidal particle in a solution of general electrolytes is governed by the nonlinear Poisson Boltzmann equation, which is a differential equation and difficult to solve analytically. In this paper we numerically calculate the electrical potential using nonlinear Qian Poisson Bolazmann integral equation (PBIE). First, we introduce the PBIE derived from the physical principles for electrostatic fields and thermodynamic systems. Then the PBIE is numerically solved by means of iteration, in which the discrete potential is solely used. Finally, the accuracy of the numerical solutions proposed here is discussed.
Study On The Diffusion Of Electroactive Molecules In Polymer Electrolyte By Microelectrode Voltammetry, Liming Ding, Shaojun Dong, Erkang Wang
Study On The Diffusion Of Electroactive Molecules In Polymer Electrolyte By Microelectrode Voltammetry, Liming Ding, Shaojun Dong, Erkang Wang
Journal of Electrochemistry
The ten years study on the diffusion of electroactive molecules in polymer electrolyte by microelectrode voltammetry was reviewed by considering the development background of polymer electrolyte materials. The classification, fabrication, applications and electrochemical measurements of microelectrode were introduced concisely. The several important factors influencing the diffusion of electroactive molecules were stressed. In the final part of this paper, some new reports on the diffusion of labeled molecules were introduced.
Study Of〔Co(2. 5 Nm) Pt(2. 5 Nm)〕N (Nâ¥50) Multilayer By Electrocrystallization, Renhe Yin, Weiming Cao, Yanpin Guo, Huifen Ji
Study Of〔Co(2. 5 Nm) Pt(2. 5 Nm)〕N (Nâ¥50) Multilayer By Electrocrystallization, Renhe Yin, Weiming Cao, Yanpin Guo, Huifen Ji
Journal of Electrochemistry
The electrocrystallization of Co(2.5 nm)/Pt(2.5 nm)n (n ≥50) multilayer has been carried out under potential control, based on observation of reflection electron microscopy (REM). Monatomic steps on Pt single crystal surfaces have been imaged using a conventional transmission electron microscope in the reflection made. The REM images have revealed three dimintional growth of Co electrocrystallization at high polarization of -1.15 V (vs.Hg/Hg2SO4). The structure of the specimen was examined by small or high angle X-ray diffration technique. The modulation period of a multilayered structure is 5.0 nm.
Study On Electrochemical Reactions Of K4[Fe(Cn)6]/K3[Fe(Cn)6] With Graze Ellipsometry, Shengtao Zhang, Changyuan Tao, Nianbing Li, Zongqing Huang, Chushao Xu
Study On Electrochemical Reactions Of K4[Fe(Cn)6]/K3[Fe(Cn)6] With Graze Ellipsometry, Shengtao Zhang, Changyuan Tao, Nianbing Li, Zongqing Huang, Chushao Xu
Journal of Electrochemistry
A measurement technology of ellipsometry called graze was put forward. Electrochemical reactions of K4[Fe(CN)6]/K3[Fe(CN)6] on glass electrode deposited indium oxide were studied with both the graze ellipsometry and cycilic voltammetry. The results indicated that ellipsometric parameter and its change during the electrochemical reactions could be confirmed with graze ellipsometry, and the regularity was corresponding to the process of electrochemical reaction. So study for electrode system could be processed with the graze ellipsometry. The graze ellipsometry could also be applied to analyze properties of diffusion layer and prosthesis limitations of other technologies.
Behavior Of Copper In Hydrogen Storage Alloy Microencapsulated By Copper, Dawei Zhang, Huatang Yuan, Huabin Yang, Zuoxiang Zhou, Yunshi Zhang
Behavior Of Copper In Hydrogen Storage Alloy Microencapsulated By Copper, Dawei Zhang, Huatang Yuan, Huabin Yang, Zuoxiang Zhou, Yunshi Zhang
Journal of Electrochemistry
Negative electrode made from Cu microencapsulated hydrogen storage alloy was studied by using cyclic voltammetry method. The results showed that copper as a coating material was of a certain stability in 5 mol/L KOH solution within the range of charge and discharge voltage. But when expanding the sweep voltage, the CV curve showed a pair of distinct oxidation reduction current peaks of Cu2O formation at E = -0.3 V and Cu2O reduction at E =-0.6 V. With charging discharging cycles, copper is liable to be oxidized to Cu2O and further oxidized into CuO2 …
Corrosion Behaviour Of Copper Covered With Ion Selective Phenolic Coatings By Eis, Zhoucheng Wang, Yingzhou Zhang, Shaomin Zhou
Corrosion Behaviour Of Copper Covered With Ion Selective Phenolic Coatings By Eis, Zhoucheng Wang, Yingzhou Zhang, Shaomin Zhou
Journal of Electrochemistry
Electrochemical impedance spectroscopy(EIS) technique was employed to study the corrosion behaviour of copper painted with the anion selective, cation selective and bipolar phenolic coatings in 3% NaCl solution. From the impedance spectrum characteristics, the models of equivalent circuit for these different coating systems were established, and the methods for the analysis of experimental impedance diagrams in terms of coating and interface properties were discussed. The research results show that the composition and structure of ion selective coatings have significant influence on corrosion behaviour of copper. The bipolar coating consisting of an anion selective inner layer and a cation selective outer …
Rechargeability Of Zn-Mno2 In Non-Aqueous Electrolyte, Baoqi Li, Hanxi Yan, Mifang Du, Xinping Ai
Rechargeability Of Zn-Mno2 In Non-Aqueous Electrolyte, Baoqi Li, Hanxi Yan, Mifang Du, Xinping Ai
Journal of Electrochemistry
A novel Zn-MnO2 battery ststem by use of spinel related MnO2 as positive electrode and Zn(ClO4)2 in propyl carbonate as electrolyte was constructed and its charge discharge behaviour was studied. The results show that the cell reaction of the system proceeds through the electrochemical intercalation of zinc into the crystalline lattice of MnO2 to form ZnxMn2O4. At x≤0.5, ZnxMn2O4 onstrates excellent cycleability (>200 cycles), higher discharge charge efficiency (>90%) and prolonged storage life.
The Electrode Process Of Some Organic Dyes Studied By Spectroelectrochemical Technique In Situ, Yinxuan Tang, Hangsheng Yang, Baoen Shen
The Electrode Process Of Some Organic Dyes Studied By Spectroelectrochemical Technique In Situ, Yinxuan Tang, Hangsheng Yang, Baoen Shen
Journal of Electrochemistry
Spectroelectrochemistry especially with in situ measurement in a cell provides a very useful mthodology for measuring the parameters of electrode process. In this paper, we report the determination of formal potentials, the number of electron transfer, the diffusion coefficient, the heterogeneous electron transfer rate constant and the transfer coefficient of some organic dyes (Methyelene blue, Neutral red, Indigo carmine) using spectroelectro chemical technique in situ.
Electrocatalytic Oxidation Of Methanol On The Stearate Nickel L-B Film, Benzeng Hua, Wenyan Hu, Yanzhen Chen, Yanhong Zhang
Electrocatalytic Oxidation Of Methanol On The Stearate Nickel L-B Film, Benzeng Hua, Wenyan Hu, Yanzhen Chen, Yanhong Zhang
Journal of Electrochemistry
The stearate nickel L-B films is good electroacatlyst for the oxidation of methanol MeOH in alkaline. The electrochemical behaviors of stearate nickel L-B films is affected by the concentration of KOH. The rate of quantity of mickel ion and stearic acid in L-B films is 1∶1, which means that the nickel ion may exist in -COONi(OH) form. The electrocatalytic process is influenced by the concentration of OH-, it involves the penetration of MeOH into the films. The oxidative currents of MeOH are linearly dependent on the bulk concentration.
Study On Electrochemical Methods Of Controlled Convolution ——A Simple Electron Transfer Reaction Followed By A Homogeneous Catalytic Reaction(Ⅰ), Ming Ma, Naixian Xie, Qianlei Gao, Yue Zeng
Study On Electrochemical Methods Of Controlled Convolution ——A Simple Electron Transfer Reaction Followed By A Homogeneous Catalytic Reaction(Ⅰ), Ming Ma, Naixian Xie, Qianlei Gao, Yue Zeng
Journal of Electrochemistry
A simple electron transfer reaction followed by a homogeneous catalytic reaction is studied in this paper by three kinds of controlled convolution electrochemical experimental methods, which are the constant semi integral (CSI), linear semi integral sweep (LSIS) and linear semi differential sweep (LSDS). According to the three methods, the following equations can be obtained. With these equations, the theoretical curves of the above three methods can be computed. Experiments of the ferrocyanide ascorbic acid catalytic system have confirmed that kinetic rate constant in catalytic reaction is in good agreement with the previously reported values.
Surface Modifications Of Carbon Materials Used As Anode Of Lithium Ion Battery Ⅲ. Improvement Of Artificially Imposed Solid Electrolyte Film On Cell Performance, Shuhua Ma, Xiabin Jing, Fosong Wang
Surface Modifications Of Carbon Materials Used As Anode Of Lithium Ion Battery Ⅲ. Improvement Of Artificially Imposed Solid Electrolyte Film On Cell Performance, Shuhua Ma, Xiabin Jing, Fosong Wang
Journal of Electrochemistry
The improving effect of solid electrolyte film artificially imposed on carbon electrode was investigated. The result showed that both the charge/discharge capacity and first charge/discharge efficiency, to a certain extent, were enhanced, and the result also suggested the effectiveness of the substitution of the artificially imposed solid electrolyte film for the inherent passivating film which was formed on the surface of the carbon electrode while inserted in the electrolyte during charging or discharging. The Scanning Electron Microscope result displayed the compact and well-defined morphology of the artificially imposed crystalline film.
Investigation On Electro Reduction Behaviour Of Copper Anodic Products In Concentrated Naoh Solutions Ⅱ. Electro Reduction Of Cu(Ⅱ) Products, Jianbo He, Hanhe Chen, Jianxin Lin
Investigation On Electro Reduction Behaviour Of Copper Anodic Products In Concentrated Naoh Solutions Ⅱ. Electro Reduction Of Cu(Ⅱ) Products, Jianbo He, Hanhe Chen, Jianxin Lin
Journal of Electrochemistry
Potentiostatic oxidation potentiodynamic or galvanostatic reduction methods have been used to study the cathodic reduction behaviour of various products anodically formed on the second stage of copper oxidation in concentrated NaOH solutions. Seven cathodic current peaks and the corresponding cathodic potential plateaus are observed on the potentiodynamic E/i curves and the galvanostatic E/t curves, respectively. In the negative potential scan, there are three couples of voltammetric peaks which have been attributed to the formation and reduction of CuO, Cu(OH)2 and Cu(Ⅱ) ion, respectively. The complicated mechanism for the electro formation of the three Cu(Ⅱ) species are discussed.
Studies On The Failure Modes Of Stationary Vrla Batteries, Yibo Tong, Xiangming Qiu
Studies On The Failure Modes Of Stationary Vrla Batteries, Yibo Tong, Xiangming Qiu
Journal of Electrochemistry
In order to improve the reliability and the quality of stationary valve-regulated lead-acid (VRLA) batteries, the failure modes of the stationary VRLA batteries which caused by the water loss and the thermal runaway are studied. The water loss may be solved by increasing the Oxygen-recombination efficiency, choosing the suitable grid material and the additives of megative paste, decreasing the corrosion of the positive plates. The thermal runaway may be solved by decreasing the inner ohmic resistance of VRLA batteries, improving the outside condition of batteries such as putting into the absorbing-heat material between the abtteries etc..
Preparation And Examination Of Planar Type Solid Oxide Fuel Cells, Yi Jiang, Jingwang Yan, Shizhong Wang, Chunying Yu, Wenzhao Li
Preparation And Examination Of Planar Type Solid Oxide Fuel Cells, Yi Jiang, Jingwang Yan, Shizhong Wang, Chunying Yu, Wenzhao Li
Journal of Electrochemistry
The solid oxide fuel cells of planar type (SOFC) have been developed after successfully preparing La0.8Sr0.2MnO3 cathodes and Ni-YSZ ceramic anodes on YSZ plates and solving the high temperature sealing technical problem. Examination of the single cells fabricated showed that the maximum power output at 950 ℃ for H2 as fuel and air as oxidant reached 0.12 W/cm2. It was found that the large polarization overpotential of the Ni-YSZ anode and the Ohmic losses of the cells were two main factors responsible for the relative low output power density.
The Electrochemical Behavior And Deposited Mechanism Of Zn-Ni Alloy Codeposition, Jixun Wu, Yongqin Liu, Huimin Meng
The Electrochemical Behavior And Deposited Mechanism Of Zn-Ni Alloy Codeposition, Jixun Wu, Yongqin Liu, Huimin Meng
Journal of Electrochemistry
The electrochemical behavior of Zn-Ni alloy codeposition and concomitant hydrogen evolution have been studied in the chloride ammonia solution through the d-c electroplating method. Under the condition of the applied cathodic current density of 2A/dm2 , the AC impedance spectra have been measured. An equivalent circuit has been presented for the impedance study on the alloy codeposition.
Preparation Of Pbo2/Ti Plate Electrode, Zhigang Shao, Baolian Yi, Xinge Zhang, Enjun Zhang
Preparation Of Pbo2/Ti Plate Electrode, Zhigang Shao, Baolian Yi, Xinge Zhang, Enjun Zhang
Journal of Electrochemistry
The perchlorate was made up of a lead dioxide plate elcetrode and an oxygen cathode. By measuring the flow capacity of cell gas in the cell, and by means of CV, SEM, XRD, the performances of the lead dioxide plate electrodes are evaluated. The influence of changes in the concentrations of electroplating solutions (F, HNO3, Bi3+, Ni2+, Fe3+ and surface active agent) is investigated. The results show that the concentrations of Fe3+ in the solutions must be lower 0.01 g/L, and the concentrations of HNO3 in the solutions are about 20 …
Electrorheological Characters Of Polyaniline Suspensions, Guangyao Su, Deshu Gao, Changqing Zhang
Electrorheological Characters Of Polyaniline Suspensions, Guangyao Su, Deshu Gao, Changqing Zhang
Journal of Electrochemistry
Polyaniline (PAn) as the dispersive particles and insulating oil as the dispersive medium, the electrorheological fluid (ERF) is constituted. Relations between the factors of electric field strength (E), temperature (T) and the static yield stress (τS), current density (i) of ERF are investigated. The results show that the changes of τS and i with electric field intensity have emerged in the exponential relation, i.e, τS∝E0.7, i∝E2.18. Otherwise, when exert a constant voltage on ERF, owing to the polarization, the absorption of medium of ERF have taken place. Therefore, the attenuation rate …
Determination Of Theine And Theinein Aminophylline By Oscillographic Titration, Zhaoren Meng, Yongfu Zhan
Determination Of Theine And Theinein Aminophylline By Oscillographic Titration, Zhaoren Meng, Yongfu Zhan
Journal of Electrochemistry
In this paper, a method is described for the determination of theine and theine in aminophglline by oscillographic titration. The theine or theine in amimophylline and AgNO3 can make precipitation quantitatively. The quantitative and excess AgNO3 is added in it, when reaction has been completed, the residual AgNO3 can be carred out directly by oscillographic titrimetry with DDTC as titrant. Trace DDTC can make a slot on oscillogram of mercury membrane and silver electrodes. Using DDTC standard solution to titrate, that is the slot appearing. It can be used to indicate end point sensitively. The characteristics of …
Effects Of Tunneling Electrons And Local Field On Nanometer Region Solid / Liquid Interfacial Reactions ——Potential Controlled Stm Induced Nanoscale Modification Of H Terminated Si(111) Surfaces, Zhaoxiong Xie, Xiongwei Cai, Caihui Shi, Bingwei Mao, Zhaowu Tian
Effects Of Tunneling Electrons And Local Field On Nanometer Region Solid / Liquid Interfacial Reactions ——Potential Controlled Stm Induced Nanoscale Modification Of H Terminated Si(111) Surfaces, Zhaoxiong Xie, Xiongwei Cai, Caihui Shi, Bingwei Mao, Zhaowu Tian
Journal of Electrochemistry
H-terminated n-Si(111) surface was found to be etched in 0.5% HF solution in nanometer scale while scanning the STM tip when the substrate potential was somehow lower than the open circuit potential at tunneling condition of Vb=+1.0 V (tip positive), It=1 nA. Much more stable Si surface was achievable at potentials much more negative than the open circuit potential (such as 500 mV negative to OCP) under the same tunneling condition. Furthermore, the etching rete at less negative potential was found to be somehow related to the tunneling current. These results indicate that the STM induced …
Studies Of Electrocatalytic Properties Of Electrode Of Dispersed Pt On Gc Support In Ethylene Glycol Oxidation, Shengpei Chen, Shigang Sun, Zhiyou Zhou, Shuanjing Hong
Studies Of Electrocatalytic Properties Of Electrode Of Dispersed Pt On Gc Support In Ethylene Glycol Oxidation, Shengpei Chen, Shigang Sun, Zhiyou Zhou, Shuanjing Hong
Journal of Electrochemistry
The structures and properties of electrocatalyst of dispersed Plutinum (Pt) on glassy carbon (GC) support under different conditions were studied using cyclic voltammetry, potential step technique, X-ray diffraction (XRD) and scanning Electron microscopy (SEM). The results indicated that after having been treated in high temperature,the dispersed Pt on GC support was recrystallised with preferented orientation, and the grain of Pt microcrystal become large and regular. It was illustrated that the dispersed Pt on GC support after high temperature treatment exhibited better stability and high activity for ethylene glycol oxidation.
Polymer Electrolyte Fuel Cell Powered Vehicles, Naichao Li, Baolian Yi
Polymer Electrolyte Fuel Cell Powered Vehicles, Naichao Li, Baolian Yi
Journal of Electrochemistry
The background, status and commercialization prospect of polymer electrolyte fuel cell vehicles are surveyed in this paper. The technology of this cell and system used in vehicles is discussed.
Electrochemical Behavior Of Superoxide Dismutase On Gold Minigrid With Thin Layer Cell, Xiaqin Wu, Qian Liu, Bin Xu, Xiaoyun Men, Zongrang Zhang
Electrochemical Behavior Of Superoxide Dismutase On Gold Minigrid With Thin Layer Cell, Xiaqin Wu, Qian Liu, Bin Xu, Xiaoyun Men, Zongrang Zhang
Journal of Electrochemistry
The electrochemical behavior of superoxide dismutase (Cu, Zn-SOD) was investigated on gold wire electrode and gold minigrid with thin layer cell by cyclic voltammetry. A quasi reversible redox wave of SOD has obtained on gold minigrid thin layer electrode, but only oxidation peak has observed on gold wire electrode. The electrochemical reaction parameters, such as the formal potential E0′, diffusion coefficient D and standard rate constant k0′ were estimated.
Study On Polarographic And Voltammetric Behaviour Of Cu(Ⅱ) Xanthosine Complex, Huizhi Fan, Jinlong Liu, Jinghao Pan
Study On Polarographic And Voltammetric Behaviour Of Cu(Ⅱ) Xanthosine Complex, Huizhi Fan, Jinlong Liu, Jinghao Pan
Journal of Electrochemistry
The polarographic and voltammetric behaviour of Cu(Ⅱ) xanthosine complex has been studied. A new sharp reduction peak is yielded at the potential of -0.14 V(vs, Ag/AgCl). The conc. of Cu(Ⅱ) is proportional to peak current of NPP in the range of 1×10-6 ～1×10-4 mol/L when the conc. of xanthosine is 1×10-4 mol/L. It is indicated that the current has adsorption character. The mechanism of the electrode reaction was deduced and the ratio of the complex is Cu(Ⅱ) ∶ xanthosine=1∶1.
Electrodeposition Of Amorphous Fe-Cr Alloy Coating, Danhong Cheng, Weiyi Xu, Yiqin Qin, Liqun Hua, Zhongyan Zhang
Electrodeposition Of Amorphous Fe-Cr Alloy Coating, Danhong Cheng, Weiyi Xu, Yiqin Qin, Liqun Hua, Zhongyan Zhang
Journal of Electrochemistry
The amorphous Fe-Cr alloy coatings were obtained by controlling the composition of bath operation conditions. It was found that the pH value, the current density and the content of chromium in Fe-Cr alloy coatings effect the amorphous structure of the coatings. The result of anodic polarization shows that the corrosion resistance of the amorphous coatings in acidic media is higher than the corrosion resistance of the crystal ones.
Studies On Electrodeposition Of Rare Earth Metals And Their Alloys In Molten Salts, Qiqin Yang
Studies On Electrodeposition Of Rare Earth Metals And Their Alloys In Molten Salts, Qiqin Yang
Journal of Electrochemistry
The cyclic voltammetry, convolution voltammetry, potentiostatic electrolysis and open circuit potential time curve after electrolysis, current time curve at potential step, potential time curve at current step, X-ray diffraction, EDAX, electron probe microanalysis were used to investigate the electrode processes of the reduction of rare earth ions on inert electrodes and alloying electrodes in molten chlorides and fluorides. The free energies of formation for the intermetallic compounds, the diffusion coefficients of rare earth ions in the melt, the diffusion coefficients of rare earth atoms in the alloy phases were determined. The alloys of rare earth with iron, cobalt, nickel, copper, …
An Analysis On The Microstructure Of Electrodeposited Zro2-Ni Functionally Graded Materials, Chengjun Quan, Xinghua Xiang, Jingchuan Zhu, Zhongda Yin
An Analysis On The Microstructure Of Electrodeposited Zro2-Ni Functionally Graded Materials, Chengjun Quan, Xinghua Xiang, Jingchuan Zhu, Zhongda Yin
Journal of Electrochemistry
The electrodeposited ZrO2-Ni functionally graded coating was fabricated by controlling the ZrO2 concentration in the bath, and the microstructure was analyzed by X-Ray Diffraction (XRD) and Electron Probe Microanalysis (EPMA). The results show that the functionally graded coating has excellent compositional gradient distribution from the substrate to the surface. The content of ZrO2 is up to 14.4 vol% in the surface layer and the coating consists of the t-ZrO2, m-ZrO2 and Ni phases. Owing to the ZrO2 particles pressed by Ni atoms during electrodepositing, t→m transformation has occurred.