A novel mechanism for the oxidation reaction of VO2+ on a graphite electrode in acidic solutions

被引：24

作者：

Wang, Wenjun ^{[1
]}

Fan, Xinzhuang ^{[1
]}

Liu, Jianguo ^{[1
]}

Yan, Chuanwei ^{[1
]}

Zeng, Chaoliu ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, State Key Lab Corros & Protect, Shenyang 110016, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2014年 / 261卷

关键词：

Vanadium; Reaction mechanism; Kinetic equation; Rotating disk system; Carbon electrodes; FLOW BATTERY; REDOX; V(IV)/V(V); IONS; CELL;

D O I：

10.1016/j.jpowsour.2014.03.053

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

With the consideration of optimizing the performance of the all-vanadium redox flow battery (VRB), the oxidation reaction mechanism of VO2+ on a rotating graphite disk electrode has been investigated by potentiodynamic polarization in sulfuric acid solutions with various pH and vanadium concentrations. Furthermore, the reaction orders of VO2+ and H+ for the oxidation reaction of VO2+ have been calculated from the polarization results and compared with the theoretical results according to the possible reaction mechanisms available in the literature. However, a new oxidation reaction mechanism has been proposed to describe the oxidation of VO2+ at last, and the theoretic reaction orders of VO2+ and H+ based on the new mechanism are consistent with the experimental results when the electrochemical reaction is the rate-limited process. Moreover, a corresponding kinetic equation has been established for the oxidation reaction of VO2+ on a spectroscopically pure graphite electrode, and can be well used to predict the polarization behavior in V (IV) acidic solutions. (c) 2014 Elsevier B.V. All rights reserved.

引用

页码：212 / 220

页数：9

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