Journal
JOURNAL OF APPLIED ELECTROCHEMISTRY
Volume 41, Issue 10, Pages 1183-1190Publisher
SPRINGER
DOI: 10.1007/s10800-011-0343-7
Keywords
Carbon paper; Vanadium redox reaction; Standard rate constants; Oxygen content; Vanadium redox-flow battery
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Funding
- Ministry of Education, Science, Sports and Culture
- Japan Society for the Promotion of Science (JSPS) [22360408]
- National Basic Research Program of China (973 Program) [2010CB227201]
- National Science Foundation Committee of China [50972165]
- Grants-in-Aid for Scientific Research [22360408] Funding Source: KAKEN
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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 x 10(-3) and 1.1 x 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.
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