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Articles 31 - 60 of 70
Full-Text Articles in Physical Sciences and Mathematics
Li Ion Intercalation Charactersitic Of Gas Coke, Zhenghua Deng, Xiaozheng Zhang, Xiaobing Ding, Mianzhong Chen, Weiguo Xie, Guoxiang Wan
Li Ion Intercalation Charactersitic Of Gas Coke, Zhenghua Deng, Xiaozheng Zhang, Xiaobing Ding, Mianzhong Chen, Weiguo Xie, Guoxiang Wan
Journal of Electrochemistry
A novel of carbon gas coke prepared from natural gas by thermoplasma technology has been studied. The cyclic voltametry and charge discharge test for the Li/gas coke cell demonstrated that this gas coke material has a good performance of the Li ion intercalation characteristic. X ray diffraction pattern of the gas cokeis showed that the structure of gas coke is similar to the graphite and collapsed from order to disorder during the charge discharge cycles. The gas coke electrode give rise to a new diffraction peak at a low angle after intercalating Li ion and a reversible capacity with 235 …
Photoelectrochemical Studies On Nanoporous Tio 2/Pan Film Electrode, Minsheng Liu, Yanzhong Hao, Xuebin Qiao, Maizhi Yang, Shengmin Cai
Photoelectrochemical Studies On Nanoporous Tio 2/Pan Film Electrode, Minsheng Liu, Yanzhong Hao, Xuebin Qiao, Maizhi Yang, Shengmin Cai
Journal of Electrochemistry
The photon to electricity conversion process of nanoporous TiO 2/PAn film electrode was studied in electrolytes with and without redox couple by using the photocurrent action spectra and potential dependence of photocurrent. It is concluded that the nanoporous TiO 2/PAn film electrode has a structure of duplex n type semiconductor layers. The band gap of PAn film is 2.88eV.The TiO 2 nanoporous film electrode modified by PAn can extend the range of optical absorption into visible and infrared region and effectively increase the photocurrent in the visible and infrared region. The photocurrent threshold shifts to>600nm and conversion efficiency of …
The Hydrogen Evolution Reaction On The Hydrogen Storage Alloy Electrode, Shigang Lu, Qun Li, Qingguo Liu, Chun Lu, Bing Dang
The Hydrogen Evolution Reaction On The Hydrogen Storage Alloy Electrode, Shigang Lu, Qun Li, Qingguo Liu, Chun Lu, Bing Dang
Journal of Electrochemistry
The hydrogen evolution reaction was studied in 1 mol/L KOH solution on the hydrogen storage alloy Mm(NiCoMnAl) 5 electrode using open circuit potential decay and ac impedance technique. The reaction was found to proceed by the Volmer(discharge)-Tafel(recombination)mechanism. The measured overpotential η can be subdivided into two components η 1 and η 2 corresponding to the elementary Volmer and Tafel reaction. The Faradaic impedance was analyzed and characterized by the Volmer reaction. Then the exchange current density was evaluated . It was founded that the activity of hydrogen storage alloy electrode for the hydrogen evolution reaction was similar to that of …
Studies On The Preparation Of Nanophase Electrode Materials And Its Electrochemical Properties(Ⅲ)—Performance Of Nm Γ Mno 2 Obtained By Microemulsion Method, Liu Ling, Xia Xi
Studies On The Preparation Of Nanophase Electrode Materials And Its Electrochemical Properties(Ⅲ)—Performance Of Nm Γ Mno 2 Obtained By Microemulsion Method, Liu Ling, Xia Xi
Journal of Electrochemistry
A nanophase MnO 2 was synthesized using w/o microemulsion as reation media, The most favorable experiment conditions for the preparation of nm MnO 2 were researched. XRD,TEM,AC impedance, cyclic voltammetry etc. examinations were used to characterize the sample comparison with the classical MnO 2 (I.C.No.1EMD,electrolytic manganese dioxide). Sample shows that the crystal styucture of the synthesized samples are mainly γ MnO 2, with average particle size in the nanometer as shown by TEM. It was found that the discharge capacity of nm MnO 2 obtained is significantly higher than that of the I.C.No.1 EMD.
Investigation Of Pb/Pb~2+And Polypyrrole Electrodes By Use Of Ac ElectrochemicalThermal Method, Jihua Zhuang, Jie Zhang, Liangjun Dong, Hong Xie, Zhiyu Jiang
Investigation Of Pb/Pb~2+And Polypyrrole Electrodes By Use Of Ac ElectrochemicalThermal Method, Jihua Zhuang, Jie Zhang, Liangjun Dong, Hong Xie, Zhiyu Jiang
Journal of Electrochemistry
The values of entropy change for Br/Br_2 and Pb/Pb~2+ electrode reactions were measured by use of the ac electrochemicalthermal method. The influence of alkaline pretreatment on the electrochemical behavior for a polypyrrole electrode was also investigated by this method. It was found that after alkaline pretreatment the eletrochemical activity of polypyrrole electrode was decreased obviously, but it kept partly electrochemicalthermal characteristic as same as that before pretreatment.
Electrochemical Preparation Of Rare Earth Functional Materials And Application Of Rare Earth To Electrochemistry, Qiqin Tong Yexiang Yang
Electrochemical Preparation Of Rare Earth Functional Materials And Application Of Rare Earth To Electrochemistry, Qiqin Tong Yexiang Yang
Journal of Electrochemistry
The new progress and related mechanism of the electrochemical preparation of rare earth materials(magnets, magnetooptic materials, battery materials, luminescent devices, semiconductors, superconductors) and the application of rare earth to the electrochemical areas(e.g. electroplating,corrosion,electrosynthses) have introduced.
Studies On Impedance Of Acidcopper Electroplating System, Wen Deng, Zhao Liu, Xiangmin Lin, Hetong Guo
Studies On Impedance Of Acidcopper Electroplating System, Wen Deng, Zhao Liu, Xiangmin Lin, Hetong Guo
Journal of Electrochemistry
The impedance characteristics of elementary solution (0.3 mol/L CuSO_4+1.94 mol/L H_2SO_4) and that with the addition of 60 mg/L Cl~-, 300 mg/L OP_21, 30 mg/L PEG, 10 mg/L 2thiazolinyldithiopropane sulfate(self-synthesized additive) are investigated and interpreted in terms of equivalent circuit. The results indicated: (1) Cl~- ion can increase cathodic polarization. (2) A twostep reaction mechanism corresponds to Cu~2+ reduction, that is: Cu~2+→Cu~+, Cu~+→Cu(adsorption)→Cu(lattice), Cu~2+ react in different forms of complex ion in sulfuric acidcupric sulfate solution with or without Cl~- ion. (3) cupric redution impedance shows dispersion effect in the solution that contains Cl~- ion.
InSitu Raman Spectroscopic Study Of The Oxidation And Reduction Of Ag Electrode In Na_2so_4 Solution, Chen Y X, Huang K Q, Tian Z Q
InSitu Raman Spectroscopic Study Of The Oxidation And Reduction Of Ag Electrode In Na_2so_4 Solution, Chen Y X, Huang K Q, Tian Z Q
Journal of Electrochemistry
Insitu Raman spectroscopy combined with cyclic voltammogram measurements was used to investigate formation of oxygen species at Ag electrode surfaces during the oxidation and reduction process in 0.1 mol/L Na_2SO_4 solution. The time dependent Raman spectra show that at potentials positive of 0.2 V, adsorption of oxygen atom occurs, while at the potentials positive of 0.4 V, some oxygen atoms migrate into subsurface of the Ag electrode and the other form strongly bound oxygen on the surface through chemical bond. At the same potentials, part of the silver atoms are oxidized and form Ag_2SO_4. During the negative potential ex cursion, …
Influences Of Ptfe On Electrochemical Properties Of FoamType Ni(Oh)_2 Electrodes, Zhen Zhou, Jie Yan, Xianyou Wang, Jinyuan Huatang Lin, Deying Song, Yunshi Zhang
Influences Of Ptfe On Electrochemical Properties Of FoamType Ni(Oh)_2 Electrodes, Zhen Zhou, Jie Yan, Xianyou Wang, Jinyuan Huatang Lin, Deying Song, Yunshi Zhang
Journal of Electrochemistry
Research work was performed for the influences of PTFE on the electrochemical properties of foamtype Ni(OH)_2 electrodes by constant current discharge. CV and EIS method. Experimental results exhibit that the existence of PTFE would decrease the reversibility of electrode reaction and increase the reaction resistance of the electrode; thus lower the discharge potential and capacity, so PTFE should be added as little as possible during the preparation of pastetype electrodes.
Study Of The Mechanisms Of The Electrochemical Reactions Of The Soluble Polyimides, Yin Zhu, Wei Xing, Hui Zhao, Guizheng Shi, Yuesheng Li, Mengxian Ding
Study Of The Mechanisms Of The Electrochemical Reactions Of The Soluble Polyimides, Yin Zhu, Wei Xing, Hui Zhao, Guizheng Shi, Yuesheng Li, Mengxian Ding
Journal of Electrochemistry
For the first time, the electrochemical behaviors of the three soluble polyimides were studied in the organic and aqueous solutions. It was found that the electrochemical behaviors of PI in the organic solutions are significantly different from that in the aqueous solution. Using the IR spectroscopy and semiempirical molecular orbital calculation and combining the results of the electrochemical measurements, the mechanisms of the electrochemical reactions of polyimides were demonstrated.
Study Of Charged Property On The Interface Of Porous Membrane Of Anodized Aluminum, Yafei Kuang, Ling Wang, Fei Hu
Study Of Charged Property On The Interface Of Porous Membrane Of Anodized Aluminum, Yafei Kuang, Ling Wang, Fei Hu
Journal of Electrochemistry
Using electrodialytic method, the relation between the pH value of tested solution and the ζ potential of porous anodized aluminum membrane, which was separated by reverse electrolysis from aluminum substrate, has been investigated. The following results can be obtained in 1.0×10-2 mol/L KCl solution: The pHIEP(isoelectric potential) of the porous membrane is equal to 9.20; In the range of 2.00
Studies On The Transport Properties Of Zn~2+ In The Zn/V_2o_5 Secondary Battery With Aqueous Medium, Jiahong Zhou, Kuanhong Xue, Guping Pan
Studies On The Transport Properties Of Zn~2+ In The Zn/V_2o_5 Secondary Battery With Aqueous Medium, Jiahong Zhou, Kuanhong Xue, Guping Pan
Journal of Electrochemistry
The transport properties and the reaction mechanism of Zn~2+ in the cathode material of Zn/V_2O_5 secondary battery with aqueous medium were studied by use of intermittent titration experiments and X-Ray diffraction analysis. The relations of some kinetic parameters to the discharge depth were discussed. The results of the experiments show that the cathodic discharge reaction is an intercalation process.
An Investigation On Galvanic Corrosion Behavior Of Co-Cr-Mo Alloy And Ti_6al_4v Alloy, Zhijun Bai, Yinshun Wu, Tiancheng Zhang
An Investigation On Galvanic Corrosion Behavior Of Co-Cr-Mo Alloy And Ti_6al_4v Alloy, Zhijun Bai, Yinshun Wu, Tiancheng Zhang
Journal of Electrochemistry
The combination of Co-Cr-Mo alloy and Ti_6Al_4V alloy is widely used as total hip prostheses. The objective of this work is to quantify the possibility of the acceleration of corrosion due to the galvanic effect. Electrochemical tests based on mixed potential and protection potential theories were used to study the galvanic corrosion behavior of coupling these alloys. The results indicated that the galvanic potential between two alloys always was in the passive potential zone of the isolated alloy respectively, and that the galvanic current of the couple is same as the corrosion current of isolated alloy under passive state. The …
Electrode Process Of Lithium Ions On Aluminum Electrode In Molten Licl-Kcl, Shuzhen Duan, Congsheng Guan, Qingrong Shi, Xindong Wang
Electrode Process Of Lithium Ions On Aluminum Electrode In Molten Licl-Kcl, Shuzhen Duan, Congsheng Guan, Qingrong Shi, Xindong Wang
Journal of Electrochemistry
The Deposition mechanism of Lithium on aluminium electrode was studied by using linear sweep voltammetry and potential step method. The formation of α-solid solution was controlled by the diffusion of lithium within the aluminium substance. The formation of β-LiAl alloy was limited by the rate of forming the alloy at the legining, and by diffiusion of lithium through the β- LiAl alloy layer was limited by the rate of forming the alloy at the begining, and by the diffusion of lithium through the β-LiAl alloy later. Neucleation polarization for the formation of β-LiAl alloy was observed. This polarization is an …
Molecular Inclusion Of Cyclodextrin Polymer And Its Application To Enzyme Electrodes, Huihuang Wu, Baozhang Wu
Molecular Inclusion Of Cyclodextrin Polymer And Its Application To Enzyme Electrodes, Huihuang Wu, Baozhang Wu
Journal of Electrochemistry
The inclusion complexation of α-cyclodextin prepolymer host with benzoquinone guest was studied by voltametry. The spectroscopic measurements show that the polycondensation of CD with glutaric dialdehyde forms the polymer (PCD) with pending carbonyl, the latter brings about covalent immobilisation of glucose oxidase (GOD) to polymer chains. Owing to the inclusion complexation of CD, the benzoquinone(BQ) as mediator of GOD can be collected in the enzymecontaining PCD membrane, resulting in high concentration of BQ in the membrane while decreasing its amount in solution. TTF was tested to prepare the immobilised enzyme together with mediator in PCD. The enzyme loading in PCD …
Study On The Substitution Of Chromium Alloy Electroplating From Trivalent Plating Bath For The Hard Chromium Plating, Huidong Li, Min Li, Huiqi Li
Study On The Substitution Of Chromium Alloy Electroplating From Trivalent Plating Bath For The Hard Chromium Plating, Huidong Li, Min Li, Huiqi Li
Journal of Electrochemistry
Recently, a vast amount of exploring experiments have been made to solve many deadly defect of existing trivalent chromium plating processes and promote to finally substitute the trivalent chromium for the hexvalent chromium plating. Technical scheme which we substitute the amorphous chromium alloy deposition for the pure chromium is determined step by step and process of amorphous CrFeC alloy plating from trivalent chromium plating bath has been developped successfully. The deposition maintains standard of traditional hexvalent chromium deposition in properties of wearresistance and corrosive wear resistance. Moreover, it completely eliminates serious enviromental pollution and has certain advantages of technological property …
Influence Of Buffers On The Electrodeposition Of Nickel From A Watts Bath, Canzh Gao, Yuli Lu, Rutao Liu, Fang Chen, Shuben Li
Influence Of Buffers On The Electrodeposition Of Nickel From A Watts Bath, Canzh Gao, Yuli Lu, Rutao Liu, Fang Chen, Shuben Li
Journal of Electrochemistry
The electrochemical reactions occurring during the deposition of nickel from Watts bath have been examined using the voltammetric technique. The important reactions taking place at the anode and cathode have been identified. The influence of buffers HAc,H_3BO_3 and NH_4Cl on the rate of nickel deposition was marked in the lower concentration (0.01-0.05 mol/L) of buffers. The reason why buffers make the rate of nickel deposition increase were discussed.
Application Of Electrochemical Process To Recycling Waste Water From Flotation Of Phosphate Ores, Shixin Sun Wen Yu
Application Of Electrochemical Process To Recycling Waste Water From Flotation Of Phosphate Ores, Shixin Sun Wen Yu
Journal of Electrochemistry
The waste water from flotation of phosphate ores can be used to recycling by electrochemical process. The suitable factors of electrochemical process is made by measuring ζ potential and transmittance of the waste water in modified way.
New Esrelectrochemical Cell Designs For Coaxial Microwave Cavity, Lin Lu Juntao Zhuang
New Esrelectrochemical Cell Designs For Coaxial Microwave Cavity, Lin Lu Juntao Zhuang
Journal of Electrochemistry
New cell designs for simultaneous electrochemical(EC) and electron spin resonance (ESR) measurements are reported for coaxial microwave cavity. Adjustable shieldings are introduced so that the working electrode can be much shorter than the full height of the cavity. Besides the traditional helical electrode, the working electrode can be cylinders made from metal plates, metallic meshes or even composite materials. The counter electrode can be placed either inside or outside the cavity. These features make the new designs more flexible than that previously reported. With a nonperforated cylindrical electrode, this cell can be used to determine the standard potential and the …
Studies Of Surface Alloy As High Efficient Electrocatalyst For Glyoxylic Acid Synthesis, Shengpei Chen, Shengqing Xia, Shigang Sun
Studies Of Surface Alloy As High Efficient Electrocatalyst For Glyoxylic Acid Synthesis, Shengpei Chen, Shengqing Xia, Shigang Sun
Journal of Electrochemistry
No abstract provided.
A Novel Pt(Ir) Plated Stainless Steel Electrode, Jingying Shi, Xiufeng Xiao, Zeshan Zhu
A Novel Pt(Ir) Plated Stainless Steel Electrode, Jingying Shi, Xiufeng Xiao, Zeshan Zhu
Journal of Electrochemistry
A novel Pt(Ir) plated stainless steel electrode have been developed, to be applied underpotential deposition and anchor effect. The electrode is provided with the excellent electrochemical characteristic, lt is possible to use the matter as micro-sensor.
Progresses In Surface Electrochemistry And Electrocatalysis ——A Review On The 1997 Joint International Meeting Of Electrochemistry And 97′ International Meeting Of Surface Electrochemistry, Shigang Sun
Journal of Electrochemistry
The progresses in surface electrochemistry and electrocatalsis reported in the 1997 joint international meeting of electrochemistry and in the 97′ international meeting of surface electrochemistry were reviewed. The main trends described in this paper consisted of 7 aspects: 1) the studies employing single crystal electrodes, 2) the development of in situ methods of diverse spectroscpoy, 3) the innovation of new research techniques, 4) the preparaton of electrocatalyst of high performances, 5) the quantitative studies on kinetics of electrocatalytic reactions, 6) the investigation on the dynamic processes of surface by timeresolved methods, and 7) the theoretical modeling and simulation of surface …
Progress In Intersection Of Modern Electrochemisity And Materials Science, Changjian Lin
Progress In Intersection Of Modern Electrochemisity And Materials Science, Changjian Lin
Journal of Electrochemistry
A brief introduction to the Joint Conference of Electrochemistry of the 48th Annual Meeting of International Society of Electrochemistry and the 192nd Electrochemistry Society was presented. The progress in intersection of modern electrochemistry and materials science was emphasized in the review.
A Preliminary Study On Thin Film Plasticizing Lithium Ion Battery, Quanfeng Dong, Hanxi Yang, Xingping Ai, Xiaohong Hu, Shengxian Li
A Preliminary Study On Thin Film Plasticizing Lithium Ion Battery, Quanfeng Dong, Hanxi Yang, Xingping Ai, Xiaohong Hu, Shengxian Li
Journal of Electrochemistry
A dry polymer electrolyte was made by plasticizing a copolymer matrix and further filling with liquid electrolyte. A thinfilm lithium ion battery based on the dry polymer electrolyte was manufactured and its electrochemical properties were measured. It is found that the thin film lithium ion battery exhibits similar discharge properties to liquid electrolyte battery, and shows strong high rate capability.
A Study On Adhesive Strength Of The Amorphous Electroless Nickel Deposite, Yi Chi, Yijan Wang, Lei Zhang, Maoyuan Ma, Laizhou Song, Xiufeng Lin
A Study On Adhesive Strength Of The Amorphous Electroless Nickel Deposite, Yi Chi, Yijan Wang, Lei Zhang, Maoyuan Ma, Laizhou Song, Xiufeng Lin
Journal of Electrochemistry
A method which is a combination of the Four Point Bend in mechanics with Acoustic Emission was used to measure the adhensive strength of electroless NiP deposits to substrates.Experimental results obtained by this method was in accordance with calculation by the model of complex plate. It was found that the pattens of the Acoustic Emission curves were related to the appearance of NiP deposit failure: the convex deposit failure was in correspondance with adhensive failure of a deposit to a substerte and the borizontal crackles with cohensive failure of a deposit.
A Study Of Adsorption Kinetics Of Β-Phenylaminopropiophenone On Iron In Acid Solution, Dihua Wang, Xianzhang Bu, Jinyun Zou, Fuxing Gan
A Study Of Adsorption Kinetics Of Β-Phenylaminopropiophenone On Iron In Acid Solution, Dihua Wang, Xianzhang Bu, Jinyun Zou, Fuxing Gan
Journal of Electrochemistry
The adsorption kinetics of β-phenylaminopropiophenone (PAP) on iron electrode in 0.5 mol/L H_2SO_4 solution with or without Cl~- were investigated by chronoamperometry. According to the following adsorption kinetic equation dθ/dt=kaCen-1(1-θ)nexp(fθ/2)-kdθexp(-fθ/2)The rate constants ka, kd as well as the adsorption free energy parameter f of PAP in sulfuric acid soltuion was calculated by used a computerized curve fitting program, the calculated ka, kd are in the order of 10~-1 mol/L s~-1 and 10~-3 s-1, respectively, f>0 in the concentration region of 5×10~-5 to 1×10~-3 mol/L of PAP. While in the 0.5 mol/L H_2SO_4 solution with 0.1 mol/L Cl-,the values of …
A Study On Heterogeneous Indirect Electrosynthesis Of Benzaldehyde, Daobao Chu, Changjian Lin, Huashui Lin, Jianguang Tan
A Study On Heterogeneous Indirect Electrosynthesis Of Benzaldehyde, Daobao Chu, Changjian Lin, Huashui Lin, Jianguang Tan
Journal of Electrochemistry
Heterogeneous indirect electrosynthesis process of benzaldehyde has been investigated using cyclic voltammetry and polarization curves. An optimum condition for preparation of benzaldehyde by indirect electrooxidation of toluenc with redox Mn~3+/Mn~2+ is given in this paper. Electrolytic regeneration Mn~3+ are made at Pt/Ti anode in “slurry” MnSO_4/H_2SO_4 medium. Current efficiency for electrolytic regeneration Mn~3+ was maintained over 88% by “double cyclic way”.
Investigation Of Methanol Anode Electrooxidation Catalysts, Gangyao Wen, Ying Zhang, Zhenglong Yang, Changzhi Li
Investigation Of Methanol Anode Electrooxidation Catalysts, Gangyao Wen, Ying Zhang, Zhenglong Yang, Changzhi Li
Journal of Electrochemistry
A series of catalysts, Pt-WO_3/C, Pt/Ru/C and Pt-Ru-WO_3/C were prepared by chemical reduction deposition. Electrocatalytic oxidation of methanol on different catalyst/Nafion membrane electrodes was studies by cyclic voltammetry and currentpotential polarization. The results indicated that the catalytic activity order of different catalysts is as follows: Pt-Ru-WO_3/C>Pt-Ru/C>Pt-WO_3/C. At the same time, influences of methanol concentrations and catalyst proportion on performances of anodes were also studies.
Study On Nano Electrode Material Of Lithium Ion Batteries, Jinkua You, Yong Yang, Dong Shu, Shenghui Wu, Yingchun Zhang, Zugeng Lin
Study On Nano Electrode Material Of Lithium Ion Batteries, Jinkua You, Yong Yang, Dong Shu, Shenghui Wu, Yingchun Zhang, Zugeng Lin
Journal of Electrochemistry
In this paper, the structure and morphology of the nano phase electrode materials have been characterized with XRD and TEM. The performances of electrochemical intercalation and deintercalation of lithium ions have been studied by using cyclic voltammograms and galvanostatic charge discharge techniques. The results show that the nano materials posses advantage of micro structure and Li+ ions intercalation performances. The observed high capacity and large charge discharge current density of the nano phase materials seem to have resulted from three kinds of effects: 1) an increase in the space for Li+ ions intercalation; 2) a decrease in the distance for …
Studies Of Surface Electrochemistry And Electrocatalysis At Atomic And Molecule Level, Shigang Sun
Studies Of Surface Electrochemistry And Electrocatalysis At Atomic And Molecule Level, Shigang Sun
Journal of Electrochemistry
The main progresses achieved during last few years in our research group concerning studies of surface electrochemistry and electrocatalysis were reviewed in this present paper. Four topics were described: 1) the surface electrochemistry and model electrocatalysis of metal single crystal planes, 2) the electrocatalytic reaction mechanism and the control of reaction pathways at molecule level, 3) the reaction kinetics of electrooxidation of small organic molecules, and 4) the relationship between the properties and the surface chemical states of electrocatalyst. This review lays in emphasis on the demonstration of the results as well as the research direction of surface electrochemistry and …