期刊
IONICS
卷 19, 期 12, 页码 1915-1920出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-013-0945-7
关键词
Additive; In3+ ions; Electrochemical activity; Kinetics; Vanadium redox flow batteries
资金
- Major State Basic Research Development Program of China (973 program) [2010CB227201]
- Innovation Project of Graduate of Hunan Province [CX2012B115]
Influence of In3+ ions on electrochemical performance of positive electrolyte for vanadium redox flow battery was investigated in this paper. The electrochemical activity and kinetics of V(IV)/V(V) redox couple can be enhanced by the addition of In3+ ions, and the optimal concentration of In3+ ions was found at 10 mM. At this condition, the oxidation peak current with 10 mM In3+ ions is 46.6 mA at a scan rate of 20 mV s(-1), larger than that of pristine electrolyte (41.8 mA), and the standard rate constant is 6.53 x 10(-5) cm s(-1), 42 % larger than that of the pristine electrolyte (4.58 x 10(-5) cm s(-1)). The cell using electrolyte with 10 mM In3+ ions was assembled, and the charge-discharge performance was evaluated, and the average energy efficiency increases by 1.9 % compared with the pristine cell. The improved electrochemical performance may be ascribed to that In3+ ions change the hydration state of vanadium ions in electrolyte and promote charge transfer process.
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