Acceleration of the redox kinetics of VO2+/VO2 + and V3+/V2+ couples on carbon paper

Autor:	Qi Xiu Zhang, Kenji Shirasaki, Suguru Ohta, Tatsuo Shikama, Fu Cong Lv, Su Qin Liu, Isamu Satoh, Dan Lu, Tomoo Yamamura, Xiong Wei Wu, Can Ming Liu
Rok vydání:	2011
Předmět:	Reaction mechanism Standard hydrogen electrode Chemistry General Chemical Engineering Inorganic chemistry Vanadium chemistry.chemical_element Glassy carbon Electrochemistry Redox Reaction rate constant Electrode Materials Chemistry
Zdroj:	Journal of Applied Electrochemistry. 41:1183-1190
ISSN:	1572-8838 0021-891X
Popis:	The redox kinetics of VO2+/VO2 + and V3+/V2+ couples on a carbon paper (CP, HCP030 N, Shanghai Hesen, Ltd., China) electrode were investigated in terms of their standard rate constant (k 0) and reaction mechanism. The values determined for k 0 for VO2+ → VO2 + and V3+ → V2+ using the CP electrode are 1.0 × 10−3 and 1.1 × 10−3 cm s−1, respectively. The value of k 0 increases by one or two order(s) of magnitude compared with values obtained using electrodes composed of pyrolytic graphite and glassy carbon. The acceleration of the redox kinetics of vanadium ions is a result of the large surface area of the CP electrode. An inner-sphere mechanism for the reaction on the surface of the electrode is proposed. The kinetic features of vanadium redox reactions on the CP electrode reveal that CP is suitable for use as the electrodes in vanadium redox-flow batteries.
Databáze:	OpenAIRE
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