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1996

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Articles 1 - 30 of 81

Full-Text Articles in Physical Chemistry

High Active Platinum Plated Titanium Electrode, Xiufeng Xiao, Zeshan Zhu, Yanzhen Chen, Wenyun Hu Nov 1996

High Active Platinum Plated Titanium Electrode, Xiufeng Xiao, Zeshan Zhu, Yanzhen Chen, Wenyun Hu

Journal of Electrochemistry

To prepare the adherent and high active platinum plated titanium electrode, ultrasonic agitation technology and the best conditions of electrodeposition were adopted. Ultrasonic agitation technology can be improved the cohesion between coatings and substrate. The activity of electrode has related to the double layer capacity of electrode, which was due to the electrode rugosity.

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Studies Of Electrochemical Behaviors Of Cytochrome C On Pretreated Gold Electrode, Jin Luo, Lingling Wu, Shaohua Huang, Zhonghua Lin Nov 1996

Studies Of Electrochemical Behaviors Of Cytochrome C On Pretreated Gold Electrode, Jin Luo, Lingling Wu, Shaohua Huang, Zhonghua Lin

Journal of Electrochemistry

The quasi reversible responses of both adsorbed and bulk cytochrome c at the pretreated gold electrode are observed. The adsorption behaviors and reaction kinetics have been studied using in situ FTIR spectroscopy, UV/Vis reflection spectroscopy, voltammetry, AC impedance and potential step methods. The results show that the cytochrome c can irreversibly adsorb on the gold surface in a complete monolayer and the adsorbed layer can mediate the redox reaction of the cytochrome c in the solution in the absence of promoter.

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Porous Gas Diffusion Oxygen Cathode For Electrodialysis Process, Hongmei Liu, Baolian Yi Nov 1996

Porous Gas Diffusion Oxygen Cathode For Electrodialysis Process, Hongmei Liu, Baolian Yi

Journal of Electrochemistry

In the process of producing silica sols by electrodialysis, with porous gas diffusion oxygen cathode instead of steel cathode, the cell voltage can be reduced 0.86～1.13 V,the power consumption of alkali silica sols (pH=9.5) is about cut down 16%, while the current efficiency has no changing. With porous gas diffusion oxygen cathode instead of steel cathode, the electrolysis electrodialysis process can be returned to electrodialysis process.

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Progresses In The Studies On Electrochemical And Surface Properties Of Hydrogen Storage Alloy Materials, Yong Yang, Jum Li, Zugeng Lin Nov 1996

Progresses In The Studies On Electrochemical And Surface Properties Of Hydrogen Storage Alloy Materials, Yong Yang, Jum Li, Zugeng Lin

Journal of Electrochemistry

Recent progresses in the studies on electrochemical and surface properties of hydrogen storage alloy materials are reviewed. This paper includes three sections: 1) Thermodynamic and kinetic studies of metal hydride electrodes, 2) Effects of micro structure and alloy elements of the materials on the electrochemical properties of the electrodes and 3) Correlation between surface properties of the alloy materials and performance of the negative electrode in the nickel metal hydride batteries.

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Electrochemical Studies Of Cyanocobalamin On Silver Electrode, Zhai Jin, Yang Pin, Donghong Zheng, Junwei Zheng, Tianhong Lu Nov 1996

Electrochemical Studies Of Cyanocobalamin On Silver Electrode, Zhai Jin, Yang Pin, Donghong Zheng, Junwei Zheng, Tianhong Lu

Journal of Electrochemistry

The electrochemical characteristics of cyanocobalamin were separately studied on smooth and roughed silver electrode. It was found that the reduction of cyanocobalamin is two one electron steps on roughed silver but one two electron step on smooth electrode. The reason is due to the ability of absorption of the surface of electrode.

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Quantitative Evaluation Of Electrochemical Properties Of Mh Alloy By Powder Microelectrode, Ronghui Hu, Hanxi Yang, Jingcheng Liu, Shengxian Li, Chuanxin Cha Nov 1996

Quantitative Evaluation Of Electrochemical Properties Of Mh Alloy By Powder Microelectrode, Ronghui Hu, Hanxi Yang, Jingcheng Liu, Shengxian Li, Chuanxin Cha

Journal of Electrochemistry

In this paper, a quantitative method by use of powder microelectrode combined with cyclic voltammetry and galvanostatic step is described for studying the electrochemical performance characteristic of hydrogen storage alloy(MH). Since the powder microelectrode uses only MH powder and has its depth and diameter of several tens of micrometer, the ohmic and concentration ploarization are greatly reduced and the influences of the technical factors in electrode preparation on the material performance are simply eliminated. Thus, with accurate determination of the load quantity of MH alloy in power microelectrode by absorption spectrometric technique, it is feasible to evaluate quickly and quantitatively …

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The Preparation Of Heteropoly Compound Polypyrrole Film Modified Electrode And Its Electrochemical Properties, Weiqing Wang, Xiumei Zhang, Long Cheng, Baifeng Liu, Shaojun Dong Nov 1996

The Preparation Of Heteropoly Compound Polypyrrole Film Modified Electrode And Its Electrochemical Properties, Weiqing Wang, Xiumei Zhang, Long Cheng, Baifeng Liu, Shaojun Dong

Journal of Electrochemistry

Electronically conducting polypyrrole doped with heteropolyanions K10H3[Nd(SiMo7W4)2]·xH2O(denoted as [Nd(SiMo7W4)2]13-) was synthesized by electrochemical polymerization. This modified electrode maintains the electrochemical and electrocatalytic properties of heteropolyanion, with having good stability and electrocatalytic activity on the reduction of nitric oxide in acidic aqueous solution.

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A Conductance Study Of Complexes Of Rare Earth With Cryptand (2.2) In Nonaqueous Solvents, Shichang Liu, Aiju Xu, Qiang Zhang Nov 1996

A Conductance Study Of Complexes Of Rare Earth With Cryptand (2.2) In Nonaqueous Solvents, Shichang Liu, Aiju Xu, Qiang Zhang

Journal of Electrochemistry

The coordination reaction of several rare earth nitrates with cryptand (2.2) in (CH3)2CO, CH3CN, CH3OH and DMF at 25 ℃ has been studied by means of using conductometric titration. The stability constants and the molar conductivities for the 1:1 coordination compounds were calculated. Since the complexation is accompanied by solvation of the Ln(Ⅲ) ion in nonaqueous solvents, for lanthanide series, there is more or less variation in stability constants of complexes of rare earth with cryptand (2.2) when atomic numbers increas. The orders of the ΛML(NO3)3 values about the same rare …

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Poisson Boltzmann Integral Equation In A Charged Capillary And Its Numerical Solutions, Yongxian Qian Nov 1996

Poisson Boltzmann Integral Equation In A Charged Capillary And Its Numerical Solutions, Yongxian Qian

Journal of Electrochemistry

The nonlinear Poisson Boltzmann integral equation (PBIE) governing electrostatic potential distribution in a charged capillary filled with symmetric electrolytes is derived from the same physical principles as used in deriving nonlinear Poisson Boltzmann differential equation, usually called PBE. PBIE is then numerically solved by iteration. In iterate computation discrele values of electrical potential is soly needed, and the first or higher orders of the differential of the potential is not used any more. This does essentially remove the difficulty caused by the very steep variation of the potential near the wall of the capillary. The results of the seven examples …

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Surface Modifications Of Carbon Materials Used As Anode Of Lithium Ion Battery Ⅰ. Influences Of Oxidation And Reduction Pretreatment On Anode Performance, Shuhua Ma, Hanju Guo, Ji Li, Hongze Liang, Xiabin Jing, Fosong Wang Nov 1996

Surface Modifications Of Carbon Materials Used As Anode Of Lithium Ion Battery Ⅰ. Influences Of Oxidation And Reduction Pretreatment On Anode Performance, Shuhua Ma, Hanju Guo, Ji Li, Hongze Liang, Xiabin Jing, Fosong Wang

Journal of Electrochemistry

The influences of the trace oxygen containing functional groups on surface of carbon material on cell performance of carbon anode for lithium ion batteries were studied by means of the pretreament in various oxidant/reductant systems. The results showed that the rich oxygen containing functional groups impaired the cell performance of carbon material anode, and the reduction of these groups in quantity and oxidation degree can increase charge/discharge capacity and improve first charge/discharge efficiency. The reason was also discussed in the light of effects of surface organic groups on decomposition reactivity of electrolyte and formation process of surface passivating film.

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The Current Distribution On The Anode Surface Of The Seale Oval Tubular Lead Acid Battery, Renao Gu, Jianlin Yao, Zhengfa Deng, Ru Sun, Liren Wu, Zhongsi Jiang, Wangen Miao Nov 1996

The Current Distribution On The Anode Surface Of The Seale Oval Tubular Lead Acid Battery, Renao Gu, Jianlin Yao, Zhengfa Deng, Ru Sun, Liren Wu, Zhongsi Jiang, Wangen Miao

Journal of Electrochemistry

The current distribution on anode surface of sealed lead acid batter under different discharge current and degree was studied by chemical analytical method for the first time. We can conclude that the current distribution is not even. The current density on the edge of the electrode surface and the electrode terminal are bigger than other areas, that is, there are edge effect and terminal effect, and these effect are more obvious when the discharge current is 100 A and degree is 100%.

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Electrochemical Study And Application Of Cyclodextrin And Its Inclusion Complexes, Shuqin Liu, Zhimin Liu, Jinghao Pan Nov 1996

Electrochemical Study And Application Of Cyclodextrin And Its Inclusion Complexes, Shuqin Liu, Zhimin Liu, Jinghao Pan

Journal of Electrochemistry

The electrochemical investigation and application of cyclodextrin and its inclusion complexes in recent years were reviewed. Studies on electrochemical behaviour of cyclodextrin inclusion complexes in our laboratory were introduced.

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Comparison Of The Charge/Discharge Charasteristics Between Ni-Cd And Ni-Mh Battery And Its Improvement Of Manufacture Technique, Yumimg Wang, Jinsheng Chen Nov 1996

Comparison Of The Charge/Discharge Charasteristics Between Ni-Cd And Ni-Mh Battery And Its Improvement Of Manufacture Technique, Yumimg Wang, Jinsheng Chen

Journal of Electrochemistry

Based on the difference of charge discharge charasteristies between Ni-Cd and Ni-MH battery, some appropriate manufacture technoque to improve the battery performances or to extend its service life are adopted.

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Determination Of Organic Basis Of Hydrochloride By The Oscillopolarographic Titration, Yongfu Zhan, Zhaoren Meng, Guirong Zhao, Jianbin Zheng, Hong Gao Nov 1996

Determination Of Organic Basis Of Hydrochloride By The Oscillopolarographic Titration, Yongfu Zhan, Zhaoren Meng, Guirong Zhao, Jianbin Zheng, Hong Gao

Journal of Electrochemistry

In this paper, diphenhydramine hydrochloride, ephedrine hydrochloride, procaine hydrochloride, vitamin B1 and vitamin B6 have been determined by the Oscillopolarographic titration. This method has not been reported in any papers up to now. The characteristics of the method are being quick and exact, easy to observe the final result and saving material tested.

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Study Of Electrochemistry Of Octa-Butyl 2,3-Naphthalocyanine Manganese (Ⅲ) In Nonaqeous Solvents, Suling Yang, Ersheng Liu, Naisheng Chen, Jinling Huang, Xiaoyu Wang, Ping Pu, Wubiao Duan, Yiqun Wu, Xia Zuo Nov 1996

Study Of Electrochemistry Of Octa-Butyl 2,3-Naphthalocyanine Manganese (Ⅲ) In Nonaqeous Solvents, Suling Yang, Ersheng Liu, Naisheng Chen, Jinling Huang, Xiaoyu Wang, Ping Pu, Wubiao Duan, Yiqun Wu, Xia Zuo

Journal of Electrochemistry

The electrochemical behavior of 5,9,14,18,23,27,32,36-Octa-Butyl 2,3-Naphalocyanine Manganese (Ⅲ) [(BuO)8NPcMn(Ⅲ)Cl] in four nonaqueous solvents was studied by means of cyclic voltammetry, and the corresponding half-wave potentials (E1/2) of redox reactions were obtained. Four (or five) pairs of redox peaks were assigned. The solvent effect on the electrochemical characteristics of this coordination compound was also discussed preliminarily, and the electrochemical behavior of the complex was compared with that of nonsubstitued naphthalocyanine.

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Fisheries Research Report No 107 - Chemical Composition Of Yabbies (Cherax Albidus Clark 1936) From Western Australian Farm Dams, Kevin A. Francesconi, Noel M. Morrissy Oct 1996

Fisheries Research Report No 107 - Chemical Composition Of Yabbies (Cherax Albidus Clark 1936) From Western Australian Farm Dams, Kevin A. Francesconi, Noel M. Morrissy

Fisheries Research Reports

Proximate analyses, amino acid and fatty acid profiles, mineral composition and heavy metal and pesticide residues have been determined for tail muscle from Cherax albidus Clark 1936 (the yabby), sampled from Western Australian farm dams. The proximate analysis values for water, protein, ash, carbohydrate and energy content and the amino acid and fatty acid profiles of yabby tail muscle were similar to those reported for other decapods. Fat levels were low and, hence, cholesterol was very low in tail meat. Organochlorine pesticides were undetectable and heavy metal residues were well below maximum permitted concentrations for human consumption.

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Cross Sections For The Production Of He+ (Np) 2p0 States By 50 To 150 Kev Proton Impact On Helium, Wayne C. Stolte, R. Bruch Sep 1996

Cross Sections For The Production Of He+ (Np) 2p0 States By 50 To 150 Kev Proton Impact On Helium, Wayne C. Stolte, R. Bruch

Chemistry and Biochemistry Faculty Research

Cross sections have been measured for the production of He+ (np) 2Po states, n=2,3,4, by proton impact on helium over a projectile velocity range of 1.42–2.45 a.u. (50 ≤E≤150 keV). Cross sections were determined by measuring the extreme ultraviolet photons emitted from excited He1 ions. The data indicate a lower energy than expected for the maximum cross section. A comparison of the present results in terms of projectile energy dependance with the cross sections for excitation to He (1snp) 1Po, ionization, and total electron capture suggests the primary mechanism …

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Kinetic-Energy- And Angular-Resolved Fragmentation Of Co In Vibrational-Resolved C 1s Excitation, N. Saito, Franz Heiser, Oliver Hemmers, K. Wieliczek, J. Viefhaus, U. Becker Sep 1996

Kinetic-Energy- And Angular-Resolved Fragmentation Of Co In Vibrational-Resolved C 1s Excitation, N. Saito, Franz Heiser, Oliver Hemmers, K. Wieliczek, J. Viefhaus, U. Becker

Environmental Studies Faculty Publications

Angular distributions of C++O+ from CO were measured, following vibrationally resolved C 1s excitations into the 2pπ, 3sσ, and 3pπ orbitals as well as into higher unresolved orbitals. A time-of-flight mass spectrometer, with a multihit-type position-sensitive anode, was used for the measurements. The anisotropy parameters (β) of C++O+ approach their theoretically expected values as the released kinetic energy in the fragmentation increases. The value of the β parameters remains constant for all vibrational states within each orbital.

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First Results From The High-Brightness X-Ray Spectroscopy Beamline 9.3.1 At Als, W. Ng, G. Jones, Rupert C. Perera, D. Hansen, J. Daniels, Oliver Hemmers, P. Glans, S. B. Whitfield, H. Wang, Dennis W. Lindle Sep 1996

First Results From The High-Brightness X-Ray Spectroscopy Beamline 9.3.1 At Als, W. Ng, G. Jones, Rupert C. Perera, D. Hansen, J. Daniels, Oliver Hemmers, P. Glans, S. B. Whitfield, H. Wang, Dennis W. Lindle

Environmental Studies Faculty Publications

Beamline 9.3.1 at the Advanced Light Source (ALS) is a windowless beamline, covering the 1–6 keV photon energy range. This beamline is designed to achieve the goal of high brightness at the sample for use in the x‐ray atomic and molecular spectroscopy (XAMS) science, surface and interface science, biology and x‐ray optical development programs at ALS. X‐ray absorption and time‐of‐flight photoemission measurements in 2–5 keV photon energy range along with the flux, resolution, spot size and stability of the beamline will be discussed. Prospects for future XAMS measurements will also be presented.

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Studies On The Charge And Discharge Reaction Of Li/Lini0.3Co0.7O2 Battery, Fupjng Zhang Aug 1996

Studies On The Charge And Discharge Reaction Of Li/Lini0.3Co0.7O2 Battery, Fupjng Zhang

Journal of Electrochemistry

The charge and discharge reaction of Li/LiNi0.3Co0.7O2 battery have been studied by using CV,CT,XRD and GCP. It is shown that the discharge capacity of the cell reaches 120-140 mA·h·g-1 in the 4.30-3.00 V in 1 mol/L LiClO4/PC electrolyte system. The discharge mechanism involve a two-step Li+ intercalation reaction. The thermodynamic data such as ΔG,ΔS, ΔH, of the reaction are given. Furthermore, the changes of the D or σi of Li+ with its composition have been discussed.

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An Esr Study Of Free Radicals In Electroreduction Process Of Allyl Alcohol, Jindong Zhang, Yafei Kuang, Shukun Huang, Naixian Xie, Fengzhen Wang, Dewen Chen Aug 1996

An Esr Study Of Free Radicals In Electroreduction Process Of Allyl Alcohol, Jindong Zhang, Yafei Kuang, Shukun Huang, Naixian Xie, Fengzhen Wang, Dewen Chen

Journal of Electrochemistry

Electrochemical-ESR technique with spin trap phenyl-t-butyl nitrone(PBN)was used to study the intermediates of electroreduction of allyl alcohol at platinized platinum electrode in acidic alcohol-aqua solution. Hydrogen and allyl group and(or)propyl group radicals were identified by a hyperfine spectrum of the radical adducts, and that provided a direct evidence for the presence of these radicals in the electroreduction of allyl alcohol.

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A Study On Solid Polymer Electrolyte Fuel Cell, Hongfeng Xu, Ming Han, Baolian Yi, Xinge Zhang, Shanhai Ge Aug 1996

A Study On Solid Polymer Electrolyte Fuel Cell, Hongfeng Xu, Ming Han, Baolian Yi, Xinge Zhang, Shanhai Ge

Journal of Electrochemistry

Solid polymer electrolyte fuel cell (SPEFC) show promise of a high level of performance in the present fuel cell. In this paper, we report the method of SPEFC electrode preparation,and the effects of temperature, pressure and gas flow rate on the performance.

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Improvement Of The Anti-Interference Characteristics Of God Electrode By Using The Powder Microelectrode Technique, Chen Jian, Chuansin Cha Aug 1996

Improvement Of The Anti-Interference Characteristics Of God Electrode By Using The Powder Microelectrode Technique, Chen Jian, Chuansin Cha

Journal of Electrochemistry

The electrochemical behavior of ascorbic acid(AA), uric acid(UA), L-cystein(L-Cys) and acetaminophen (APAP), i.e. The main interference to the GOD electrode, were studied at the Pt,GC and powder microelectrode. Experimental results indicated that, due to the electrochemical activity of these interference, it is difficult to eliminate their interference effects by manipulation of electrode materials or working potential of the GOD electrode. However, it was found that the limiting curtents at the KB electrode are mainly controlled by mass transfer in liquid phase, so it is only related to the geometer size of the electrode, not its real surface area. Therefore, it …

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The Effect Of Co On The Proton Diffusion Coefficient For The Ni(Oh)2 Electrodes, Xiaoyan Cao, Zuoxiang Zhou, Huatang Yuan, Yunshi Zhang Aug 1996

The Effect Of Co On The Proton Diffusion Coefficient For The Ni(Oh)2 Electrodes, Xiaoyan Cao, Zuoxiang Zhou, Huatang Yuan, Yunshi Zhang

Journal of Electrochemistry

The diffusion coefficients of protons moving in the Ni(OH)2 electrodes have being investigated by constant current, cyclic voltammetry and potential step technineques. The electrodes were prepared by cathodic deposition and their active material contained 0～53% cobalt. It was found that the diffusion coefficients are about 10-9～10-10 cm2/s during charging and about 10-11 cm2/s during discharging. Moreover the value increases with the increacing content of Co in the electrodes. During the calculation, the relevant fomulars were modified especially the wrong fomular for constant current methode.

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Electrochemical Study Of The Corrosion Behavior Of Coalesced Copper And Sw-206 Stainless Steel In The Acetic-Acid Solution, Rongzong Hu, Changjian Lin, Jianguang Tan, Zhanmei Sun, Xueqin Wu, Biao Wang Aug 1996

Electrochemical Study Of The Corrosion Behavior Of Coalesced Copper And Sw-206 Stainless Steel In The Acetic-Acid Solution, Rongzong Hu, Changjian Lin, Jianguang Tan, Zhanmei Sun, Xueqin Wu, Biao Wang

Journal of Electrochemistry

In order to provide a theoretic and experimental consideration for the material selection and anit-corrosion in the petrochemical industries the corrosion behavior of coalesced copper and sw-206 stainless steel in the acetic acid solution was studied by electrochemical impedance spectroscopy and polarization techniques. The effects of the temperature, acetic acid concentration and solubilized oxygen in the acetic acid solution on the corrosion process of this two metals were analyzed. It was found that these effects obviously accelerate corrosion process for the coalesced copper, but no apparent influnce for the sw-206 stainless steel.In the the acetic acid solution, containing water and …

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A Study On Electrochemical Oxidation Of Reduced Nicotinamide Coenzyme Nadh In Organic Media, Fangzu Yang, Huihuang Wu, Shukai Xu, Shaomin Zhou Aug 1996

A Study On Electrochemical Oxidation Of Reduced Nicotinamide Coenzyme Nadh In Organic Media, Fangzu Yang, Huihuang Wu, Shukai Xu, Shaomin Zhou

Journal of Electrochemistry

The behaviour of electrochemical oxidation of the reduced nicotinamide coenzyme NADH on glassy carbon was studied and some kinetic parameters were measured by means of voltammometry in the N-dimethylformamide (DMF) and 1,4-dioxane media respectively. The eletrochemical oxidation of NADH shows completely irriversable both in the two solvents,and the diagnostic experiments support that the process involves a fast chemical step.The oxidation rate and the diffusion coefficient of NADH in DMP are smaller than those in 1,4-dioxane, but the response current is more stable in DMF. The experimental results are discussed by solvent effects.

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A Preliminary Study Of Electrochemically Amplified Measurement Of Gold Electrodeposition, Bingwei Mao, Caihui Shi, Xiaoqin Li, Lihua Xiong Aug 1996

A Preliminary Study Of Electrochemically Amplified Measurement Of Gold Electrodeposition, Bingwei Mao, Caihui Shi, Xiaoqin Li, Lihua Xiong

Journal of Electrochemistry

Gold electrodeposition onto a glassy carbon microelectrode is studied using an electrochemical amplification method. Taking the advantage that the electrochemical reduction of K2Cr2O7 has significantly higher reaction activity on gold electrode than carbon electrode, it is tentatively used to amplify the gold electrodeposition current. The results show that there is a marked increase in current of gold electrodeposition in presence of K2Cr2O7 in comparison with that absent of K2Cr2O7.The electrochemical amplification method can be applied to study the electrodeposition of very in intial stage …

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A Review Of Differential Electrochemical Mass Spectroscopy Techniqueⅰ. The Principle And Development Of Dems, Fujikawa Keikichi, Li Feng Aug 1996

A Review Of Differential Electrochemical Mass Spectroscopy Techniqueⅰ. The Principle And Development Of Dems, Fujikawa Keikichi, Li Feng

Journal of Electrochemistry

No abstract provided.

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Time-Resolved Electron Spin Resonance Spectroscopy For In-Situ Studies Of Electrochemical Systems, Lin Zhuang, Juntao Lu Aug 1996

Time-Resolved Electron Spin Resonance Spectroscopy For In-Situ Studies Of Electrochemical Systems, Lin Zhuang, Juntao Lu

Journal of Electrochemistry

No abstract provided.

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Surface Raman Spectra Obtained From Various Electrodeposited Transidon Metals, Jingsong Gao, Bin Ren, Qunjian Huang, Zhongqun Tian Aug 1996

Surface Raman Spectra Obtained From Various Electrodeposited Transidon Metals, Jingsong Gao, Bin Ren, Qunjian Huang, Zhongqun Tian

Journal of Electrochemistry

Good quality potential-dependent surface Raman spectra of pyridine were obtained for the first time from a series of transition metals, e. g., Fe, Co, Ni, Ru, Rh, Pd and Pt, which were electrodeposited on non-SERS-active substrates. The influences of the applied potential and the nature of metal on the adsorption behaviors were discussed briefly. This result illustrates that Raman spectroscopy is becoming a more general and powerful tool to study various electrochemical interfaces.

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