期刊
JOURNAL OF APPLIED ELECTROCHEMISTRY
卷 43, 期 5, 页码 541-551出版社
SPRINGER
DOI: 10.1007/s10800-013-0538-1
关键词
Zinc electrodeposition and dissolution; Sulfuric acid; Additive; Zinc-based redox flow battery
资金
- National Basic Research Program (973 Program) of China [2010CB227204]
Electrodeposition and dissolution of zinc in sulfuric acid were studied as the negative electrode reactions in acidic zinc-based redox flow batteries. The zinc deposition and dissolution is a quasi-reversible reaction with a zinc ion diffusion coefficient of 4.6 x 10(-6) cm(2) s(-1) obtained. The increase of acid concentration facilitates an improvement in the kinetics of zinc electrodeposition-dissolution process. But too high acid concentration would result in a significant decrease in charge efficiency. The performance of the zinc electrode in a three-electrode system with magnetic stirring was also studied as a function of Zn(II) ion concentration, sulfuric acid concentration, current density, and the addition of additives in 1 M H2SO4 medium. The optimum electrolyte composition is suggested at high zinc(II) concentration (1.25 M) and moderate sulfuric acid concentration (1.0-1.5 M) at a current density range of 20-30 mA cm(-2). Whether in acid-free solution or in sulfuric acid solution with or without additives, no dendrite formation is observed after zinc electrodeposition for 1 h at 20 mA cm(-2). The energy efficiency is improved from 77 % in the absence of additives in 1 M H2SO4 medium to over 80 % upon the addition of indium oxide or SLS-Sb(III) combined additive as hydrogen suppressants.
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