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Analyses and optimization of electrolyte concentration on the electrochemical performance of iron-chromium flow battery

Author

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  • Wang, Shaoliang
  • Xu, Zeyu
  • Wu, Xiaoliang
  • Zhao, Huan
  • Zhao, Jinling
  • Liu, Jianguo
  • Yan, Chuanwei
  • Fan, Xinzhuang

Abstract

In order to improve the electrochemical performance of iron-chromium flow battery, a series of electrolytes with x M FeCl2 + x M CrCl3 + 3.0 M HCl (x = 0.5, 0.75, 1.0, 1.25) and 1.0 M FeCl2 + 1.0 M CrCl3 + y M HCl (y = 1.0, 2.0, 3.0, 4.0) are prepared, and the effect of electrolyte concentration on the electrochemical performance of iron-chromium flow battery are firstly investigated. The viscosity of electrolyte increases along with the increasing concentration of FeCl2, CrCl3 and HCl, however, the corresponding conductivity decreases with the increasing concentration of FeCl2 and CrCl3 but increases with the increasing HCl concentration. It is worth noting that the electrolyte with 1.0 M FeCl2, 1.0 M CrCl3 and 3.0 M HCl presents the best electrochemical performance due to the synergistic effect of viscosity, conductivity and electrochemical activity. Most importantly, iron-chromium flow battery with the optimized electrolyte presents excellent battery efficiency (coulombic efficiency: 97.4%; energy efficiency: 81.5%) when the operating current density is high up to 120 mA cm−2. This work can improve the battery performance of iron-chromium flow battery more efficiently, and further provide theoretical guidance and data support to its engineering application.

Suggested Citation

  • Wang, Shaoliang & Xu, Zeyu & Wu, Xiaoliang & Zhao, Huan & Zhao, Jinling & Liu, Jianguo & Yan, Chuanwei & Fan, Xinzhuang, 2020. "Analyses and optimization of electrolyte concentration on the electrochemical performance of iron-chromium flow battery," Applied Energy, Elsevier, vol. 271(C).
    • Handle: RePEc:eee:appene:v:271:y:2020:i:c:s0306261920307649
    DOI: 10.1016/j.apenergy.2020.115252
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    1. Wu, Min & Nan, Mingjun & Ye, Yujiao & Yang, Mingjun & Qiao, Lin & Zhang, Huamin & Ma, Xiangkun, 2024. "A highly active electrolyte for high-capacity iron‑chromium flow batteries," Applied Energy, Elsevier, vol. 358(C).

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