Electrocatalytic oxidation of oxalic acid on palladium-based modified glassy carbon electrode in acidic medium
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Oxalic Acid
Glassy carbon
Carbon fibers
Metal salen complexes
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Glassy carbon
Carbon fibers
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Electrochemical reactions involved in the electrodeposition of PbSe and the electrochemical behaviour of the related precursors, HSeO3− and Pb(EDTA)2−, have been studied for the first time by combined electrochemical quartz crystal microbalance and cyclic voltammetry measurements. Formation of PbSe was found to occur by an induced codeposition mechanism via a six-electron reduction reaction. HSeO3− is reduced by a four-electron reaction but the electrode becomes passivated. The reduction and oxidation of Pb(EDTA)2− occur via two-electron mechanisms, on the other hand, during the oxidation adsorption reactions are also observed.
Quartz Crystal Microbalance
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The electrochemical behavior of V 2O 3, V 2O 5 and NH 4VO 3 at carbon paste electrode(CPE) in H 2SO 4 solution were investigated by cyclic voltammetry. The results showed that for vanadium(Ⅲ) compound there appeared two reduction peaks but three oxidation peaks in cyclic voltammograms in different H 2SO 4 concentration solutions, while for two vanadium(Ⅴ) compounds there were four reduction peaks and four oxidation peaks, quite close to each other. The corresponding redox peaks were reasonably analyzed and the reaction mechanism has been discussed briefly.
Carbon paste electrode
Carbon fibers
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Dipicolinic acid
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Cyclic voltammetry,IR spectroelectrochemistry,cyclic voltabsorptometry and derivative cyclic voltabsorptometry techniques were used to investigate the electrochemical reduction of tetramethyl-p-benzoquinone(TMBQ) in CH3CN solution.The experimental results showed that the electrochemical reduction of TMBQ is not simple two-step single electron transfer process.Further study indicated that the reduction process is coupled with following chemical reaction.An irresversible oxidation peak at-0.32 V was observed.The result suggests that dimerization reaction occurred during the electrochemical reduction process of TMBQ.In situ IR spectroelectrochemistry further confirmed the formation of dimers.
Benzoquinone
Derivative (finance)
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Chronoamperometry
Glassy carbon
Linear sweep voltammetry
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The formation of a passive film on iron in a oxalic acid medium was studied by the technique of cyclic voltammetry. The results show that the metal dissolves anodically and the ions Fe2+, coming from this dissolution, form with oxalate ions a soluble complex of the type [Fe(C2O4)3]4-. The maximum of the voltammogram corresponds to the complete formation of the passive film. The electrochemical reaction that occurs at the electrode is of type :
Oxalic Acid
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Oxalic Acid
Glassy carbon
Carbon fibers
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Chronoamperometry
Chemical reduction
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