scholarly journals Electro-deposition and re-oxidation of carbon in carbonate-containing molten salts

2014 ◽  
Vol 172 ◽  
pp. 105-116 ◽  
Author(s):  
Happiness V. Ijije ◽  
Richard C. Lawrence ◽  
Nancy J. Siambun ◽  
Sang Mun Jeong ◽  
Daniel A. Jewell ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Molten Salts ◽  
Carbon Deposition ◽  
Solid Carbon ◽  
Partial Reduction ◽  
Constant Voltage ◽  
Electro Deposition ◽  
Electrode Reactions ◽  
Electrode Cell ◽  
Potential Applications

The electrochemical deposition and re-oxidation of solid carbon were studied in CO32− ion-containing molten salts (e.g. CaCl2–CaCO3–LiCl–KCl and Li2CO3–K2CO3) at temperatures between 500 and 800 °C under Ar, CO2 or N2–CO2 atmospheres. The electrode reactions were investigated by thermodynamic analysis, cyclic voltammetry and chronopotentiometry in a three-electrode cell under various conditions. The findings suggest that the electro-reduction of CO32− is dominated by carbon deposition on all three tested working electrodes (Ni, Pt and mild steel), but partial reduction to CO can also occur. Electro-re-oxidation of the deposited carbon in the same molten salts was investigated for potential applications in, for example, direct carbon fuel cells. A brief energy and cost analysis is given based on results from constant voltage electrolysis in a two-electrode cell.

The role of correlations in the determination of the transport properties of LaCl3 in high temperature molten eutectic LiCl–KCl

2017 ◽  
Vol 105 (8) ◽  
Author(s):  
Adib Samin ◽  
Evan Wu ◽  
Jinsuo Zhang
Keyword(s):  
Cyclic Voltammetry ◽  
High Temperature ◽  
Transport Properties ◽  
Molten Salts ◽  
Careful Consideration ◽  
Accurate Assessment

AbstractIt is important to develop an accurate assessment of fundamental data of lanthanides in high temperature molten salts to enable an efficient application of pyroprocessing. This requires a careful consideration of uncertainties in the reported results. In this study, cyclic voltammetry (CV) tests of LaCl

Recovery of fission palladium by electrodeposition using room temperature ionic liquids

2006 ◽  
Vol 94 (3) ◽  
Author(s):  
P. Giridhar ◽  
K. A. Venkatesan ◽  
B. P. Reddy ◽  
T. G. Srinivasan ◽  
P. R. Vasudeva Rao
Keyword(s):  
Cyclic Voltammetry ◽  
Ionic Liquids ◽  
Nuclear Fuel ◽  
Glassy Carbon ◽  
Molten Salts ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids ◽  
Redox Behavior ◽  
Working Electrode ◽  
Irradiated Nuclear Fuel

SummaryRoom temperature molten salts for possible application of recovery of fission palladium from irradiated nuclear fuel/wastes have been investigated. The redox behavior of a solution of palladium(II) chloride and 1-butyl-3-methylimidazolium chloride (bmimCl) at glassy carbon working electrode has been studied at various temperatures using cyclic voltammetry. The voltammogram of bmimCl-PdCl

scholarly journals The Preparation of Carbon Nanotube/MnO2Composite Fiber and Its Application to Flexible Micro-Supercapacitor

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Li Li ◽  
Chen Chen ◽  
Jing Xie ◽  
Zehuai Shao ◽  
Fuxin Yang
Keyword(s):  
Cyclic Voltammetry ◽  
Carbon Nanotube ◽  
Specific Capacitance ◽  
Ultrathin Films ◽  
Electronic Devices ◽  
High Specific Capacitance ◽  
Composite Fiber ◽  
Potential Applications ◽  
Cyclic Voltammetry Method ◽  
Fiber Electrode

In recent years, flexible electronic devices pursued for potential applications. The design and the fabrication of a novel flexible nanoarchitecture by coating electrical conductive MWCNT fiber with ultrathin films of MnO2to achieve high specific capacitance, for micro-supercapacitors electrode applications, are demonstrated here. The MWCNT/MnO2composite fiber electrode was prepared by the electrochemical deposition which was carried out through using two different methods: cyclic voltammetry and potentiostatic methods. The cyclic voltammetry method can get “crumpled paper ball” morphology MnO2which has bigger specific capacitances than that achieved by potentiostatic method. The flexible micro-supercapacitor was fabricated by twisting two aligned MWCNT fibers and showed an area specific capacitance of 2.43 mF/cm2. The flexible micro-supercapacitors also enable promising applications in various fields.

Electrochemical Treatment of Graphene

2019 ◽  
Vol 799 ◽  
pp. 197-202
Author(s):  
Alexander Usikov ◽  
Mike Puzyk ◽  
Sergey Novikov ◽  
Iosif Barash ◽  
Oleg Medvedev ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Partial Oxidation ◽  
Electrochemical Method ◽  
Counter Electrode ◽  
Reference Electrode ◽  
Electrochemical Treatment ◽  
Complete Dissolution ◽  
Graphene Films ◽  
Working Electrode ◽  
Electrode Cell

Treatment of graphene/SiC dies in inorganic electrolytes (KOH, KCl and Na2SO4) is discussed. An electrochemical method based on the cyclic voltammetry in a conventional three-electrode cell with Ag/AgCl reference electrode, a platinum counter electrode, and the graphene/SiC dies as working electrode (anode) is used for the treatment. It was observed either partial oxidation of graphene or its complete dissolution with the formation of CO2. The treatment performed resulted in the deterioration of the graphene films and change of the graphene-die resistivity depending on the range of the scanning potential applied to the graphene/SiC dies.

Influence of Second Coordination Sphere on the Kinetics of Electrode Reactions in Molten Salts

2002 ◽  
Vol 57 (9-10) ◽  
pp. 85-88 ◽  
Author(s):  
S. A. Kuznetsov ◽  
M. Gaune-Escarda
Keyword(s):  
Coordination Sphere ◽  
Rate Constants ◽  
Diffusion Coefficients ◽  
Redox Reaction ◽  
Alkali Halide ◽  
Molten Salts ◽  
Electrode Reactions ◽  
Standard Rate ◽  
Second Coordination Sphere ◽  
Kinetics Of

The influence of the second coordination sphere on the electroreduction of hafnium complexes to hafnium metal, and the redox reaction Eu(III) + e⇔ ,Eu(II) in alkali halide melts was studied. It is shown that the large caesium cations in the melt reduce the transfer and the diffusion coefficients as well as the heterogeneous rate constants for charge transfer of hafnium complexes. The standard rate constants for the europium redox reaction increase when going from NaCl-KCl to CsCl. The different influence of the second coordination sphere on the electrode reactions is explained by different limitation stages for electron transfer.

Electrochemical Fabrication of Cu2O Photocathode for Photoelectrochemical Hydrogen Evolution Reaction

2015 ◽  
Vol 659 ◽  
pp. 226-230 ◽  
Author(s):  
Pattranit Thongthep ◽  
Somporn Moonmangmee ◽  
Chatchai Ponchio
Keyword(s):  
Cyclic Voltammetry ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Ph Value ◽  
Low Cost ◽  
Previous Method ◽  
Mixed Solution ◽  
Deposition Method ◽  
Electro Deposition ◽  
Excellent Method

In this study, we can fabricate Cu2O on F-doped SnO2coated glass (FTO) substrates as photocathode for hydrogen evolution reaction by electro-deposition techniques. Cyclic voltammetry as a new deposition method was studied to fabricate Cu2O photocathode in a mixed solution of Cu (NO3)2and KNO3under a condition of low temperature and without pH value adjustment. Amperometry as a previous method was used to compare for Cu2O electrode fabrication under the situation of pH adjustment and higher temperature condition. A photocurrent from hydrogen evolution reaction was performed by keep potential at-0.2 V in 0.1 M Na2SO4under visible irradiation comparing with both fabricated method. The Cu2O photocathode from cyclic voltammetry deposition method presents photoelectrocatalytic activity higher than that of amperometry deposition method with the optimum conditions. This electro-deposition technique represents the excellent method with simple, fast and low cost of Cu2O photocathode fabrication for photoelectrochemical hydrogen evolution reaction.

scholarly journals Carbon electrodeposition in molten salts: electrode reactions and applications

RSC Advances ◽  
2014 ◽  
Vol 4 (67) ◽  
pp. 35808-35817 ◽  
Author(s):  
Happiness V. Ijije ◽  
Richard C. Lawrence ◽  
George Z. Chen
Keyword(s):  
Carbon Dioxide ◽  
Molten Salts ◽  
Molten Carbonate ◽  
Energy Materials ◽  
Electrode Reactions ◽  
Carbonate Salts

Carbon dioxide can be electrochemically reduced to carbon in molten carbonate salts, promising affordable energy, materials and environmental explorations.

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