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

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Abstract

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.

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Acknowledgments

We thank Mr. M. Takahashi from the Institute for Materials Research (IMR), Tohoku University, for his kind assistance. All experiments were performed at the Experimental Facility for Alpha-Emitters of IMR, Tohoku University. We also thank Prof. Y. P. Wu from Fudan University, Shanghai, China. This work was partly supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (B) 22360408 from Japan Society for the Promotion of Science (JSPS). The research was partly supported by the National Basic Research Program of China (973 Program No: 2010CB227201) and National Science Foundation Committee of China (50972165).

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Correspondence to Xiong Wei Wu.

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Wu, X.W., Yamamura, T., Ohta, S. et al. Acceleration of the redox kinetics of VO2+/VO2 + and V3+/V2+ couples on carbon paper. J Appl Electrochem 41, 1183–1190 (2011). https://doi.org/10.1007/s10800-011-0343-7

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  • DOI: https://doi.org/10.1007/s10800-011-0343-7

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