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electrode process of diethyldithiocarbamate on surface of pyrrhotite

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Journal of Central South University of Technology 2005年第4期12卷 416-419页

作者：黎维中覃文庆邱冠周董清海 School of Resources processing and Bioengineering Central South University Changsha 410083 China General

The electrode process of diethyldithiocarbamate on the surface of pyrrhotite was studied using systematic electrochemical analysis, including cyclic voltammetry, chronopotentiometry and galvanostatic. Experimental results show that tetraethylthioram disulphide（TETD） is electrodeposited on pyrrhotite electrode surface in the presence of 1.0×10^-4 mol/L diethyldithiocarbamate when the electrode potential is higher than 0.25 V. The electrochemical kinetics parameters of the electrode process of diethyldithiocarbamate on surface of pyrrhotite are calculated as follows： the exchange current density is 2.48μA/cm^2 , and the transmission coefficient is 0.46. The electrodeposition includes two steps electrochemical reaction. The first reaction is electrochemical adsorption of diethyldithiocarbamatc ion, then the adsorbed ion associates with a diethyldithiocarbamate ion from the solution and forms tetraethylthioram disulphide on the surface of pyrrhotite.

关键词： electrode process pyrrhotite diethyldithiocarbamate

electrode process of Y^(3+)Ion on Molybdenum and Nickel electrodes in YCl_3-NaCl-KCl Melt

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Journal of Rare Earths 1991年第3期9卷 177-180页

作者：张小联赵敏寿 Changchun Institute of Applied Chemistry Academia SinicaChangchun 130022China

The electrode process of Y^(3+)ion on molybdenum and nickel electrodes has been studied by cyclic voltammetry and chronopotentiometry in the YCl_3-NaCl-KCl *** overall charge transfer process is a two-step reaction:Y^(3+)+e=Y^(2+);Y^(2+)+2e=*** reduced on the nickel electrode can form a series of Ni-Y alloys.X-ray diffraction analysis was employed to determine the alloy compositions formed under different con- ditions.

关键词： Y^(3+)ion Mo electrode Ni electrode electrode process

electrode process of Y（Ⅲ）on Nickel electrode and Surface Metallizing

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Rare Metals 1994年第4期13卷 241-245页

作者：周春根段淑贞王新东

In this study, the electrochemical reduction of Y(Ⅲ)on nickel electrode has been investigated. The resultsshow that there are several plateaus for formation of intermetallic compounds preceding reduction peak ofyttrium. A linear relationship between the current and t￣(-1/2) has been obtained, showing that Cottrell's law isobeyed.

关键词： Yttrivm electrode process Metallizing Cyclic voltammetry

Kinetics of electrochemical process of galena electrode in diethyldithiocarbamate solution

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中国有色金属学会会刊：英文版 2001年第4期11卷 587-590页

作者：覃文庆邱冠周胡岳华徐竞中南大学矿物工程系湖南长沙 410083

The electrode process of galena in diethyldithiocarbamate (DDTC) solution at pH 11.4 has been investigated using cyclic voltammetry, potentiostatic and chronopotentiometry. electrodeposit of PbD 2 on galena electrode surface can occur while the electrode potential is higher than -0.05?V. The relationship between the current density caused by diffusion and reaction time has been ascertained, and the diffusion coefficient of DDTC on galena surface in DDTC solution is about 1.12×10 -6 cm 2/s. A passive PbD 2 film covers the surface of galena electrode.

关键词： electrode process galena electrochemistry of flotation

Electrochemical study of different membrane materials for the fabrication of stable,reproducible and reusable reference electrode

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Journal of Energy Chemistry 2020年第10期29卷 33-41页

作者： Nawar K.Al-Shara Farooq Sher Sania Z.Iqbal Zaman Sajid George Z.Chen Department of Chemical and Environmental Engineering University of NottinghamUniversity ParkNottingham NG72RDUnited Kingdom School of Mechanical Aerospace and Automotive EngineeringFaculty of EngineeringEnvironmental and ComputingCoventry UniversityCoventry CV12JHUnited Kingdom Department of Biochemistry University of AgricultureFaisalabad 38000Pakistan Department of process Engineering Memorial University of NewfoundlandSt John’s Newfoundland A1B 3×5Canada

Fabrication of stable,reproducible and reusable reference electrodes for low energy and high-temperature steam splitting is of great interest for hydrogen fuel production without anthropogenic carbon dioxide(CO2)*** study has been conducted for the detection of suitable material for the fabrication of novel reference *** the present scenario,this research is designed to fabricate a novel nickel reference electrode by using operating conditions of eutectic molten hydroxide(NaOH-KOH,49-51 mol%)at temperature 300℃in an ion-conducting membrane of alumina and mullite ***,the designed nickel reference electrode has been examined for its reusability and stability by using electrochemical technique and cyclic *** scans of cyclic voltammetry are performed for both membrane fabricated reference electrode.A slight positive shift in oxidation peaks is observed for mullite membrane electrode(64 mV from scan 1 to 5).The stability measurements are noted by changing the scan rate between 50 and 150 mV s−***,the results show that the Ni/Ni(OH)2 reference electrode covered with a mullite membrane is stable and reusable at 300℃temperature without any *** stability and reusability of prepared nickel reference electrode covered by mullite tube in the eutectic molten hydroxide were up to 9 days to carry out an electrochemical investigation,while for alumina tube reference electrode the stability and reliability were up to 3 *** internal electrolytic material and ionic conductance can play an important role for future studies with this reference electrode along with optimisation of temperature and scan rate parameters.

关键词： Renewable energy Hydrogen production electrode process Cyclic voltammetry Reference electrode and Molten salts

Cooling Rates of PREP Ti48Al Alloy

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Journal of Materials Science & Technology 2001年第1期17卷 91-92页

作者： Xuezhu MA Jun SHEN Xiumei QI Jun JIA School of Materials Science&Engineering Harbin institute of TechnologyHarbin 150001China

Determining the cooling rate of a rapidly-solidified (RS) technique subjectively is a prerequisite of knowing the RS technique, and it is difficult. Model of heat transfer is constructed in this paper in order to calculate cooling rates of rapidly-solidified Ti48AI alloy. Rapid solidification technique utilized is the plasma rotating electrode process (PREP hereafter). The results show that: the cooling rate of PREP is at the scope of 102-103 K/s.

关键词： cooling rate electrode process heat transfer RS technique in order

Effect of Cerium on Lithium-Aluminium Anode

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Journal of Rare Earths 1996年第4期14卷 262-266页

作者：管从胜段淑贞招光文 Department of Physical Chemistry University of Science and Technology Beijing Beijing 100083 China

The electrode kinetics of cerium on aluminium electrode and its effects on the behavior of the lithium-aluminium anode were studied by using cyclic voltammetry and chronoamperometry. The electrochemical properties and physical behavior of lithium-aluminium anode were improved by adding cerium into aluminium before lithium was deposited. Some parameters for preparing lithium-aluminium electrodes were also given.

关键词： cyclic voltammetry electrode process lithium-aluminium alloy aluminium-cerium riley

A strategy to improve the accuracy of digital simulation for electroanalytical chemistry

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Chinese Journal of Chemistry 1997年第3期15卷 250-259页

作者： Fang, H Chen, HY Deportment of Chemistry Nanjing University Nanjing Jiangsu 210093 China

A strategy for digital simulation methods was presented for solving partial differential equations, called as IPBFP which is to insert M points before the first time point of the usual way, to decrease simulation errors. The theoretical analysis and simulation results show that it can improve the fully implicit method with any dimensionless diffusion coefficient lambda, Crank-Nicolson method with large lambda and Saul'yev method with small lambda. The IPBFP is convenient to arrange the simulation time points flexibly and reduce calculation time and errors. This approach can combine the merits of non-uniform time grid and uniform time grid methods in simulation for electrochemical studies.

关键词： IPBFP digital simulation time grid electrode process

Universal Electrochemical/Chemical Simulator Based on an Exponentially Expanding Grid Network Approach

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Chinese Journal of Chemistry 2004年第7期22卷 719-726页

作者：邓兆祥林祥钦童中华 Department of Chemistry University of Science and Technology of China Hefei Anhui 230026 China

A universal simulator capable of simulating virtually any user-defined electrochemical/chemical problems in one-dimensional diffusion geometry was developed based on an exponentially expanding grid modification of the existing network approach. Some generalized reaction-diffusion governing equations of an arbitrary electrochemical/chemical process were derived, and program controlled automatic generation of the corresponding PSPICE netlist file was realized. On the basis of the above techniques, a universal simulator package was realized, which is capable of dealing with arbitrarily complex electrochemical/chemical problems with one-dimensional diffusion geometry such as planar diffusion, spherical diffusion, cylindrical diffusion and rotational disk diffusion-convection processes. The building of such a simulator is easy and thus it would be very convenient to have it updated for simulations of newly raised electrochemical problems.

关键词： electrochemical simulator electrode process network approach exponentially expanding grid