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Journal of Electrochemistry

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A Sutface-Enhanced Raman Spectroscopic Study On The Inhibition Mechanism Of Bmat On Stainless Steel In Hydrochloric Acid Solutions, Yinghua Zha, Baoming Wei May 1995

A Sutface-Enhanced Raman Spectroscopic Study On The Inhibition Mechanism Of Bmat On Stainless Steel In Hydrochloric Acid Solutions, Yinghua Zha, Baoming Wei

Journal of Electrochemistry

The absorbtion of some nitrogen and sulfur compounds such as BMAT on 18-8stainless steel(SS)in 0.5% HCl were investigated by surface enhanced Raman scattering(SERS)spectroscopy.The SERS spectra of BMAT adsorbed on SS were measured using a SS electredepositedwith discontin uous silvet micro-islands.The results show that the inhibitor,BMAT,is chemisorbed onthe SS surface through the N atom. Under the influence of π-electron interaction ,BMAT can beadsorbed on SS surface at an angle. The allyls in BMAT molecules play the role of steric hindrance inthe inbibition effect.

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Study On The Electron Transfer Process Of Cytochrome C With Different Charge Transfer Promoters, Guoxin Tang May 1995

Study On The Electron Transfer Process Of Cytochrome C With Different Charge Transfer Promoters, Guoxin Tang

Journal of Electrochemistry

The diffusion coefficient D. standard rate constant and transfer coefficient afor electron transfer process of cytochrome C at OTTLE in the presence of 4,4'-Dithiedipyridine(PySSPy),Adenine and L-Cysteine were determined by the chronoadsorptometric technique with Au-OTTLE. A computer fitting method was used to calculated these kinetic parameters.The mechanismsof PysSPy,Adenine and L-Cysteine were used as the promoters,and were also discussed.

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Horseradish Peroxidase/Poly-O- Phen Ylenediamine Mem Brane Electrode:Preparation And Properties, Dong Wei, Huihuang Wu May 1995

Horseradish Peroxidase/Poly-O- Phen Ylenediamine Mem Brane Electrode:Preparation And Properties, Dong Wei, Huihuang Wu

Journal of Electrochemistry

A horseradish peroxidase(HRP)/poly-o-phenylenediamine(PPD)membraneelectrede was prepared by electropolymerization of o-phenylenediamine on glassy carbon in pH 7.0phosphate buffer,the process of the enzyme immobilization was studied,The enzyme electredeobtained exhibits the activity to catalyze the electrored uction of hydrogen peroxide in the absence ofany electron transfer mediator.The red uction reaction occurs in the potential range of PPD redoxprocess,it was believed that the polymer participates in electron transfer of the enzyme.The enzymereaction kinetics at rotating H RP/PPD electrede was analysed,and the factors influencing kineticparameters were discussed.

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Studies Of The Black Molybdate Conversion Film On Stainless Steel, Jingli Fang, Liuqin Liuqin, Keping Han, Yaohui Chen May 1995

Studies Of The Black Molybdate Conversion Film On Stainless Steel, Jingli Fang, Liuqin Liuqin, Keping Han, Yaohui Chen

Journal of Electrochemistry

A black conversion film was formed on stainless steel with cathodicelectrodeposition method from a molybdate-phosphate solution. This film displayed goodthemcotability. The results of XPS and AES analysis showed that the thickness of the film was 820 nmand that Mo existed as Mo(Ⅵ)in the surface of the film,while existed as Mo(Ⅵ)and Mo(Ⅳ)in theinternal layer of the film. The relative atomic percent content(A,C.% of the film obtained from theelemental composition constant region of the depth profile curves by AES was O 50.9%,Mo 29.4%,P12.6%and Fe 7.1%respectively.The cyclevoltammetric oxluation peak also showed that Mo(Ⅳ)existed in the internal layer of the film.

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Study Of The Electrochemistry Of Systems Of Practical Importance, Chuansin Cha, Juntao Lu May 1995

Study Of The Electrochemistry Of Systems Of Practical Importance, Chuansin Cha, Juntao Lu

Journal of Electrochemistry

Research projects mainly of the following two categories have been carrying on inthis laboratory:1.Development of experimental electrochemical methedes,including traditional electrochemicaland spectro-electrochemical techniques suitable for the study of practical electrochemical systems,suchas porous electrodes,powdery materials,hazardous(toxic,explosive)systems,etc.2.Study of electrochemical systems possessing practical importance,including mechanistic andelectrocatalytic studies.The studied electrochemical systems are mostly related to electrochemicalpower sources,electrochemical sensors and electrochemical synthesis.

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Studies On Low Temperature Performance Of Rechargeable Mh-Ni Batteries, Wenkuan Zhang, Jingxian Shi, Yu Wan Lou, Qiusheng Duan May 1995

Studies On Low Temperature Performance Of Rechargeable Mh-Ni Batteries, Wenkuan Zhang, Jingxian Shi, Yu Wan Lou, Qiusheng Duan

Journal of Electrochemistry

The Dependence of low temperature performance on the alloy composition andelectrolyte component for rechargeable MH-Ni batteries is studied, the suitable composition of alloyand electrofyte are founds.

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Electrochemically Modified Glassy Carbon Electrode And Determination Of Copper By Anodic Stripping Voltammetry, Jinrui Xu, Yie Liu, Xiurun Zhuang May 1995

Electrochemically Modified Glassy Carbon Electrode And Determination Of Copper By Anodic Stripping Voltammetry, Jinrui Xu, Yie Liu, Xiurun Zhuang

Journal of Electrochemistry

This paper reported the glassy carbon electrode modified by cyclic voltammetrybetween-0. 1and + 1. 5 V(vs. SCE)in an aqueous solution containing catechol,formaldehyde andtalium hydroxide. The modified electrode can be applied to the determination of copper(Ⅱ) in water,and its sensitivity is about 35 times higher than that of unmedified glassy carbon electrede, Thequantitative limit with this modified electrede is 0. 1 ng/ml.

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The Reduction Of Oxygen To Hydrogen Peroxide At The Poly(O-Phenylenediamine)-Filmed Electrode, Zhaoe Lu, Tiangeng Zhong, Guanyong Zhang May 1995

The Reduction Of Oxygen To Hydrogen Peroxide At The Poly(O-Phenylenediamine)-Filmed Electrode, Zhaoe Lu, Tiangeng Zhong, Guanyong Zhang

Journal of Electrochemistry

The poly(o-phenylenediamine)(PPD)filmed graphite electrode was formed byelectro-polymerization of o-phenylenediamine in acidified(pH=1)0.2 mol·L-1 Na_2SO_4 solutionusing the cyclic voltammetric methed. The catalytic effect of the electrcareduction of oxygen in acidsolution was demonstrated by the voltammogram of the electrede in the oxygen saturated acid solutionof Na_2SO_4. The current efficiency of the reduction of oxygen to hydrogen peroxide was determined byIhe electrolysis in a divided cell under the condition of constant current. The various effectsinfluencing the accm ulation of H_2O_2 in the catholyte were discussed.

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Studies On Coordination Behavior Of Dimethyl Sulfoxide In Complex Of Rare Earth With Cryptand, Shichang Liu May 1995

Studies On Coordination Behavior Of Dimethyl Sulfoxide In Complex Of Rare Earth With Cryptand, Shichang Liu

Journal of Electrochemistry

lectrochemical reduction reaction in the course of the titration of Eu ( 2.2.2)and Eu( 2.2)using strong bonding solvent,DMSO,in C_2H_4Cl_2 has been investigated by cyclicvoltammetry. The greater the concen tration of strong bonding solvent,the more negative the half-wave potentials for the reduction reaction are. The coordination number of Eu(2.2.2 ) and Eu(2.2)which are 2 and 3 respectively,with DMSO can be calculated,according to the relations betweenhalf -wave potentials and the variety of concentration of DMSO.

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The Formation And Voltammetric Behavior Of Manganese Chlorophyll, Qingdong Qiao May 1995

The Formation And Voltammetric Behavior Of Manganese Chlorophyll, Qingdong Qiao

Journal of Electrochemistry

The formation and voltam metric behavior of manganese chlorophyll werestudied.The electrochemical red uction mechanism of Mn chlorophyll a (MnChla)in aqueous solutionwas investigated and discussed.During the electrored uction of MnChla ,the porphyrin ring was singlyreduced with 2 electrons and the Mn￣(2+) ion remained its original state,The reduction rate constant k_m=0.36/s was gained.

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Application Of Voltammetry In Analysis Of Electroplating Baths, Jiayuan Xu, Shaomin Zhou Feb 1995

Application Of Voltammetry In Analysis Of Electroplating Baths, Jiayuan Xu, Shaomin Zhou

Journal of Electrochemistry

Based upon the electrochemical characteristics of the components or impurities tobe determined in the electroplating baths,and the inhibition or activation effect of the additives usedon the electrodepcosition processes of metals and alloys,direct voltammetry,indirect voltammetry andvoltammetry with anodic stripping of metallic deposits,were suggested to determine the concentrationof some components,several impurities and the additives usually used in the electroplating baths.Theprocedure of those methtods are simple and rapid,and are suitable to be used for in situ control inelectroplating workshops.

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A Investigation Of Hydrogen-Storage Alloy As Catalytic Electrode For Hydrogenation Of Nitrobenzene, Shigang Lu, Hanxi Yang, Changfa Wan Feb 1995

A Investigation Of Hydrogen-Storage Alloy As Catalytic Electrode For Hydrogenation Of Nitrobenzene, Shigang Lu, Hanxi Yang, Changfa Wan

Journal of Electrochemistry

Since hydrogen.storage alloy ean not only absorb hydrogen atoms to form highlyreactive metal hydride as hydrogen source by electrolysis but also possesses a certain catalytic activityfor hydrogenation,it is thus feasible to utilize the allov as a novel electrOde for electrolvtichydrogenation in organic electrored uction. This work employed misch metal AB_5 type alloy as acatalytic electrode and studied the electrochemical hydrogenation of nitrobenzene. The hydrogen-storage electrede(MH)was a plastic bonded electrede sheet made from a paste ofMm(NiCoMnAl)_5 alloy powder and teflon emulsion. The electrolysis was performed at constantcurrent and controlled potential in a three electrede cell of H-type configuration. The electrolyte was0.5 …

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Electroreduction Of The Nittobenzene On Titanium Electrode Implanted With Palladium, Zhongda Wu, Xianjun Zhu, Hongsen Wang Feb 1995

Electroreduction Of The Nittobenzene On Titanium Electrode Implanted With Palladium, Zhongda Wu, Xianjun Zhu, Hongsen Wang

Journal of Electrochemistry

The titanium substrates were bombarded with 1×10￣(17)～5×10￣(17)ions·cm￣(-2) ofpalladium at the room temperature. The surface composition of implanted electrede and concentration-depth profiles of various elements were measured by AES. The electrored uction processes ofnitrobenzene(NB)in 0.1 mol/L NaOH solution at Pd/Ti electrodes have been investigated by cyclicvoltaivimetry.The results show that the palladium implanted titanium electrodes exhibit a high catalyticactivity in the electroreduction of NB. The NB radical anion,which is the product of one-electronelectroreduction of NB,was detected by ESR in-situ in conjunction with electrochemical methods. Aniline was also detected as a product of electroreduction of NB by using UV-spectra in-situ. According to the …

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Atomic And Molecular-Perspectives In Electrochemical Interfaces, Zhaowu Tian Feb 1995

Atomic And Molecular-Perspectives In Electrochemical Interfaces, Zhaowu Tian

Journal of Electrochemistry

The following recent studies on the atomic and molecular-perspectives atelectrochemical interfaces using Raman,IR,STM and quantum chemical methed by electrOchemistrygroup in Xiamen University are briefly reviewed. 1.Orientation,charge transfer and bonding of adsorbed molecules. 2.Adsorption effect,electrode potential effect and adatom effect on the electron populations and strength of intramolec ular bonds of the adsorbed molecules. 3.Detailed classification into various types(e. g.,competitive,chemically inductive, physical inductive etc.)of coadsorption on electrodes according to the above-mentioned effects. 4. Single crystal face structure effect and adatom effect on the kinetics and the mechanisms of electrocatalytic oxidation processes of small organic molecules. 5.Electrochemical scanning tunneling microscopy(ECSTM)specially designed for …

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Studies Of Elecctrochcmical Oscillation Of Au/Hcl In Presence Of ″Positive Feedback ″Of Substrate Electrodes, Bin Ren, Bingwei Mao, Xiongwei Cai, Tao Jiang, Jiqian Mu Feb 1995

Studies Of Elecctrochcmical Oscillation Of Au/Hcl In Presence Of ″Positive Feedback ″Of Substrate Electrodes, Bin Ren, Bingwei Mao, Xiongwei Cai, Tao Jiang, Jiqian Mu

Journal of Electrochemistry

No abstract provided.

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Electrocatalytic Oxidation Of Formaidehyde And Formic Acid On A Pt/Sb_(Ad) Electrode, Hong Li, Lincai Jiang, Xiong Jiang Feb 1995

Electrocatalytic Oxidation Of Formaidehyde And Formic Acid On A Pt/Sb_(Ad) Electrode, Hong Li, Lincai Jiang, Xiong Jiang

Journal of Electrochemistry

The electrocatalytic activity for the oxidation of formaldehyde and formic acid ona Sb-modified platinum (Pt/Sb_(ad))was investigated.Results showed that the Pt/Sb_(ad) electrode waselectrocatalytically more active than a Pt electrode in the anodic oxidation of formaldehyde and formicacid.In the case of formaldehyde,an oxidation peak appeared at a potential of ca.0.7V.During theoxidation of formic acid,a 4-fold increase in the 1st peak current was observed.The Sb-modifiedplatinum electrode was found to be most electrocatalytically active at a coverage of 0.75±0.05.Theelectrocatalytic activity of the Pt/Sb_(ad) electrode can be best explained in terms of the geometrical effect,which may lead to the inhibition of the formation of the …

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The Device Of Wy-Ⅱ Type Cyanide Monitor And Its Applications, Xianmin Wang Feb 1995

The Device Of Wy-Ⅱ Type Cyanide Monitor And Its Applications, Xianmin Wang

Journal of Electrochemistry

A device of WY-Ⅱtype micro-computerized cyanide monitor is presented,inwhich the cyanide analvsis is carried out by means of microcoulomb-iodimetric with automaticfollowing system.This instrument can be successifully employed to analyze the cyanides in industrial waste-waterfor vavious departments of chemical industry.A serious of experimental tests showed that theanalytical sensitivity went up to 0.01 mg/L and the accuracy of determination was excellentlycoincided with that of National standard method and other methods.

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The Ehect Of Some Ions On Anodic Formation Process At Pt And Pbo_2 Electrodes, Shixiong Jin, Zhigang Zhou, Lan Wang Feb 1995

The Ehect Of Some Ions On Anodic Formation Process At Pt And Pbo_2 Electrodes, Shixiong Jin, Zhigang Zhou, Lan Wang

Journal of Electrochemistry

The influence of Ag_2SO_4,Li_2SO_4,Na_2SO_4,K_2SO_4,NH_4)_2SO_4,MgSO_4 and KF onthe evolution of O_2 and the formation of Cr_2O at Pt and PbO_2 anodes was investigated in mixedH_2SO_4-Cr_2(SO_2)_3 solutions.The kinetic data related respectively to Cr_2O formation and O_2 evolutionat Pt and PbO_2 anodes were measured by method of resolving the steady-state polarization curve.TheTafel slope of steady-state ～1g i relationships for Cr_2O formation reaction is close to 2×2. 303RT/βF,whereas for O_2 evolution it is close to 2.303 RT/βF(with β=0.5). The results indicate thatthe current efficiency for Cr_2O formation is increased by adding Ag￣+ ions to the anolyte and decreasedby adding Li￣+,Na￣+,K￣+,NH and Mg￣(2+) ions to …

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Transient Photocurrent Behavior Of Multiple Quantum Well Gaas/Al_Xga_(1-X)As Electrode, Liuyao Liuyao, Xurui Xiao, Liyuan Liyuan Feb 1995

Transient Photocurrent Behavior Of Multiple Quantum Well Gaas/Al_Xga_(1-X)As Electrode, Liuyao Liuyao, Xurui Xiao, Liyuan Liyuan

Journal of Electrochemistry

Transient photocurrents induced by short light pulses at lattice-matched multiplequantum well(MQW)GaAs/Al_(0.3)Ga_(0.7)As electredes were studied in the 1 ×10￣(-2)mol·dm￣(-3)ferrocene([Fc￣0]/[Fc)￣+]=9/1)-0.1 mol·dm￣(-3)tetrabutylammonium tetrafluoroborate acetonitrile solutionin order to examine the relaxation photoprocesses and to evaluate kinetic parameters of superlattice electrodes. GaAs/Al_(0.3)Ca_(0. 7)As MQW electrode consisting of 10 periods with each of GaAs well(5.3nm)and Al_(0. 3)Ga_(0. 7)As barrier(10nm)showed two pronounced and well-resolved peak structures located at 1.503 eV and 1.699 eV in the photocurrent spectrum,corresponding to the theoretical allowedexcitonic transitions(Δn=0) for heavy holes(H11,H22)in the quantum well respectively. Transient photocurrent spectra were measured by a monochromatic light pulse with 7 μs pulsewidth and 9 nJ·cm￣(-2) of …

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A Photoelectrochemical Investigation Of Zirconium Oxide Film, Maizhi Yang Feb 1995

A Photoelectrochemical Investigation Of Zirconium Oxide Film, Maizhi Yang

Journal of Electrochemistry

A photoelectrochemical investigation has been carried out on zirconium initialoxide film and its oxide film grownanodically at constant rate up to different thickness. Both anodicand cathedic photocurrents on the photocurrent spectrum depended on the potential,but had littlerelation with the forming anedic films or measuring solutions. Photocurrent spectrum and photocurrenttransients suggested that the oxide films on zirconium were duplex layers structure. The internal layerwas ZrO_2 and the external layer ZrO_2·(H_2O)_n. The photocurrent included photogenerated carrier ininternal and external oxide films,as well as internal photoinjection process for electrons from thesubstrate metal into the electrode/electolyte interface reacting with the redox couple. The analysis …

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Electroreduction Of Holmium Ion On Iron Electrde In Molten Cholorides, Qiqin Yang, Guankun Liu, Yuzhi Su Feb 1995

Electroreduction Of Holmium Ion On Iron Electrde In Molten Cholorides, Qiqin Yang, Guankun Liu, Yuzhi Su

Journal of Electrochemistry

The cyclic voltammetry,open circuit potential-time curve after poteritiostaticelectrolysis,current-time curve at potential step,x-ray diffraction and electron probe microanalysiswere used to investigate the electrode process of Ho(Ⅲ)reduced on iron electrode in molten chloridesand the phases of surface alloy layer.The Ho-Fe alloys are formed at first,and then the metallicholmium is deposited when Ho(Ⅲ)is reduced on iron electrede. The charge transfer is reversible. Thefree energies of formation for the four intermetallic compounds of Ho-Fe system,the diffusioncoefficients and diffusion activation energy of Ho in alloyed cathode are determined.

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Study Of Electrochemical Properties Of Ni(Oh)_2 /Niooh With Spectroscopic Ellipsometry, Shengtao Zhang, Zongqing Huang Feb 1995

Study Of Electrochemical Properties Of Ni(Oh)_2 /Niooh With Spectroscopic Ellipsometry, Shengtao Zhang, Zongqing Huang

Journal of Electrochemistry

Electrochemical reactions of Ni(OH)_2 /NiOOH system were studied by using in-situ spectroscopic ellipsometry and the conventional electrochemical metheds.By fitting data fromellipsometric measurements,a transformation medel of the surface film was obtained for cathedic andanodic processes. The results indicated that the transformation medel after cobalt implantation almostremained the same as that before cobalt implantation,but the electrochemical properties wereaffectedobviously by implantation of cobalt.

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Synthesis Of Li_Xcoo_2 And Its Behaviour In Rechargeable Lithium Battery, Mingfeng Guo, Ruimin Yang, Zebo Zhang, Jincao Ye Feb 1995

Synthesis Of Li_Xcoo_2 And Its Behaviour In Rechargeable Lithium Battery, Mingfeng Guo, Ruimin Yang, Zebo Zhang, Jincao Ye

Journal of Electrochemistry

The Variations of crystal lattice parameters of Li_xCoO_2 during charge anddischarge have been st ud ied by XRD and AAR spectroscopy.It was found that the Li_xCoO_2 crystalvolume expanded during charge and contracted during discharge.The crystal lattice structure wasbroken because of the formation of Co_3O_4 when deeply charge.The variation of lattice parameter C_0value in cycling process was similar to that in charge process.The variation of 006 peak was the mostsensitive in every case.In case of preheating for 20 hours at 700℃ before operating hightemperature,the 006 peak obtained an enhancement obviously.It has had the good rechargeability inmeasurement of the cyclic voltammograms,the CV …

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The Electrode Process Of Y(Ⅲ)On Copper Electrode And Its Surface Metallizing, Chungen Zhou, Shuzhen Duan Feb 1995

The Electrode Process Of Y(Ⅲ)On Copper Electrode And Its Surface Metallizing, Chungen Zhou, Shuzhen Duan

Journal of Electrochemistry

The reduction of yttrium ion on copper electrode in NaCl-KCl-YCl_3 molten saltshas been investigated.The results indicate that the formation of intermetallic compounds is occuredbefore the metallic yttrium to be formed.The formation of intermetallic compounds is controlled bythe process of which yttrium atoms are diffusing into copper electrode.The kinetic characters todiffusion of yttrium atoms were also discussed.

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The Catalytic Behavior For Ni-W Electrode Modified By Carbon Ion Beam Implantion, Jishuang Zhang, Yaojiao Lv, Qinglian Li Feb 1995

The Catalytic Behavior For Ni-W Electrode Modified By Carbon Ion Beam Implantion, Jishuang Zhang, Yaojiao Lv, Qinglian Li

Journal of Electrochemistry

The hydrogen evolution activity in acidic and basic mediums for Ni-W electrodemodified by carbon ion beam implantation was investigated.The experimental results show thiselectrode has superior catalytic activity for the hydrogen evolution reaction than that of the unmodifiedNi-electrode.Long period testing of electrolysis under high current density show that this electrode hasalonger useful life hence it is a practical electrode material.The temperature effect of electrocatalyticproperty was also inverstigated.The experimental regularities are explained on the basis of the formation of surface m uItialloys of Ni-W-WC.

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Self Assembly Via Layer By Layer Surface Reaction On Gold Electrodes And The Electrochcmical Characterization, Xiandui Dong, Juntao Lu, Chuanxin Cha Feb 1995

Self Assembly Via Layer By Layer Surface Reaction On Gold Electrodes And The Electrochcmical Characterization, Xiandui Dong, Juntao Lu, Chuanxin Cha

Journal of Electrochemistry

The self-assembled monolayers,which were built by spontaneous adsorption of ω-carboxylic acid thiols on gold surface,were used as substrate for further modification through later bylayer amide surface reactions.At each stage of modification,the gold surface was characterizedelectochemieally. The results demonstrated that the strategies of layer by layer self assembly is ofsignificant potential for fabrieating functionalized ultrathin layers.

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The Study Of The Growth Processes Of The Oxides On Lead Electrodes In Sulfuric Acid Solution, Hesheng Zhai, Xuguang Chen, Jinkua You, Yong Yang, Zugeng Lin Feb 1995

The Study Of The Growth Processes Of The Oxides On Lead Electrodes In Sulfuric Acid Solution, Hesheng Zhai, Xuguang Chen, Jinkua You, Yong Yang, Zugeng Lin

Journal of Electrochemistry

The growth processes of PbO and PbO_2 on lead electrodes have been investigatedby using in-situ methods that are combined with temporary AC resistance measurment technique andin-situ laser scanning photoelectrochemical microscopy.It is found that a linear relationship existsbetween the electrode resistance(R)and￣(1/2) after the electrode is oxidized at +0.6 V(vs.Hg/H_2SO_4/35%H_2SO_4)for more than 5 min.This result suggests that the growth of PbO is well distributedduring the early stage of oxidation.The study by using laser scanning photoelectrochemical microscopyhas further proved this point.The results also show that the growth of PbO_2 takes place and develops.

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Application Of Inhibitor To Improve The Anticorrosion Performance Of Electrophoretic Coating, Changshou Cai, Fangteng Su, Bihuan Liu, Guomou Wen, Jingdong Guo Feb 1995

Application Of Inhibitor To Improve The Anticorrosion Performance Of Electrophoretic Coating, Changshou Cai, Fangteng Su, Bihuan Liu, Guomou Wen, Jingdong Guo

Journal of Electrochemistry

To improve the anti-corrosion performance of electrocoating,organic andinorganic inhibitors are applied in an anodic electrophoretic-coating.The results show that thedeposition of polymer with zinc phospate exhibits a high inbihition efficiency.The inhibitionmechanism of the inhibitor in electrocoating has been studied.

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