Frontiers in Chemistry (Jun 2021)

Enhanced Catalysis of P-doped SnO2 for the V2+/V3+ Redox Reaction in Vanadium Redox Flow Battery

  • Xiaojian Feng,
  • Zixuan Zhang,
  • Tongxue Zhang,
  • Jing Xue,
  • Chao Han,
  • Lei Dai,
  • Ling Wang,
  • Zhangxing He

DOI
https://doi.org/10.3389/fchem.2021.688634
Journal volume & issue
Vol. 9

Abstract

Read online

In this work, nanosized P-doped SnO2 (SnO2-P) was prepared by a sol–gel method as a catalyst for the V3+/V2+ redox reaction in vanadium redox flow battery. Compared with SnO2, the electrochemical performance of SnO2-P is significantly improved. This is because P doping provides more active sites and shows greatly improved electrical conductivity, thereby increasing the electron transfer rate. As a result, SnO2-P shows better catalytic performance than SnO2. The SnO2-P modified cell is designed, and it exhibits an increase of 47.2 mA h in discharge capacity and 8.7% in energy efficiency compared with the pristine cell at 150 mA cm−2. These increases indicate that the modified cell has a higher electrolyte utilization rate. This study shows that SnO2-P is a new and efficient catalyst for vanadium redox flow battery.

Keywords