Zinc deposition and dissolution in sulfuric acid onto a graphite–resin composite electrode as the negative electrode reactions in acidic zinc-based redox flow batteries

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• 作者：Junli Pan (1)
  Yuehua Wen (2)
  Jie Cheng (2)
  Junqing Pan (1)
  Zhangli Bai (1)
  Yusheng Yang (1) (2)
  
• 关键词：Zinc electrodeposition and dissolution ; Sulfuric acid ; Additive ; Zinc ; based redox flow battery
• 刊名：Journal of Applied Electrochemistry
• 出版年：2013
• 出版时间：May 2013
• 年：2013
• 卷：43
• 期：5
• 页码：541-551
• 全文大小：1001KB
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• 作者单位：Junli Pan (1)
  Yuehua Wen (2)
  Jie Cheng (2)
  Junqing Pan (1)
  Zhangli Bai (1)
  Yusheng Yang (1) (2)
  
  1. College of Science, Beijing University of Chemical Technology, Beijing, 100029, China
  2. Research Institute of Chemical Defence, Beijing, 100191, China
  
• ISSN：1572-8838

文摘

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?×?10? cm2 s? 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-.5?M) at a current density range of 20-0?mA?cm?. 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?. 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.