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Investigation on Concentrated V(IV)/V(V) Redox Reaction by Rotating Disc Voltammetry
Author(s) -
Wen YueHua,
Zhang HuaMin,
Qian Peng,
Ma HaiPeng,
Yi BaoLian,
Yang YuSheng
Publication year - 2007
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200790055
Subject(s) - chemistry , redox , cyclic voltammetry , kinetics , diffusion , voltammetry , analytical chemistry (journal) , kinetic energy , electrochemistry , sulfuric acid , glassy carbon , electrode , inorganic chemistry , organic chemistry , thermodynamics , physics , quantum mechanics
The kinetic characteristics of the concentrated V(IV)/V(V) couple have been studied at a glassy carbon electrode in sulfuric acid using rotating‐disc electrode and cyclic voltammetry. The kinetics of the V(IV)/V(V) redox couple reaction was found to be electrochemically quasi‐reversible with the slower kinetics for the V(V) reduction than that for the V(IV) oxidation. And, dependence of diffusion coefficients and kinetic parameters of V(IV) species on the V(IV) and H 2 SO 4 concentration was investigated. It is shown that the concentration of active species V(IV) should be over 1 mol·L −1 for the redox flow battery application. Further, with increasing the V(IV) and H 2 SO 4 concentration, the diffusion coefficients of V(IV) were gradually reduced whereas its kinetics was improved considerably, especially in the case of V(IV) and H 2 SO 4 up to 2 and 4 mol·L −1 .