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

Xiong Wei Wu, Tomoo Yamamura, Suguru Ohta, Qi Xiu Zhang, Fu Cong Lv, Can Ming Liu, Kenji Shirasaki, Isamu Satoh, Tatsuo Shikama, Dan Lu, Su Qin Liu

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54 Citations (Scopus)

Abstract

The redox kinetics of VO2+/VO2+ and V 3+/V2+ couples on a carbon paper (CP, HCP030 N, Shanghai Hesen, Ltd., China) electrode were investigated in terms of their standard rate constant (k0) and reaction mechanism. The values determined for k0 for VO2+ → VO2+2+ And V 3+ → V2+ using the CP electrode are 1.0 × 10-3 and 1.1 × 10-3 cm s-1, respectively. The value of k0 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.

Original languageEnglish
Pages (from-to)1183-1190
Number of pages8
JournalJournal of Applied Electrochemistry
Volume41
Issue number10
DOIs
Publication statusPublished - 2011 Oct

Keywords

  • Carbon paper
  • Oxygen content
  • Standard rate constants
  • Vanadium redox reaction
  • Vanadium redox-flow battery

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry
  • Materials Chemistry

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