Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (9): 1298-1310.DOI: 10.1016/S1872-2067(19)63349-8

• Reviews • Previous Articles     Next Articles

Bifunctional electrocatalysts for rechargeable Zn-air batteries

Yibo Guo, Ya-Nan Chen, Huijuan Cui, Zhen Zhou   

  1. School of Materials Science and Engineering, Institute of New Energy Material Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCast), Nankai University, Tianjin 300350, China
  • Received:2019-01-08 Online:2019-09-18 Published:2019-07-06
  • Contact: S1872-2067(19)63349-8
  • Supported by:
    This work was supported by the National Natural Science Foundation of China NSFC (51702166) and Tianjin Municipal Science and Technology Bureau (17JCZDJC37100).

Abstract: Zn-air batteries have attracted extensive attention for their unique features including high energy density, safety, low cost and environmental friendliness. However, due to their poor chargeability and low efficiency, the practical application remains a challenge. The main obstacles are the intrinsic slow reaction kinetics on air cathodes, including oxygen reduction reaction during the discharging process and oxygen evolution reaction during the recharging process. Searching for efficient bifunctional oxygen electrocatalysts is key to solve these problems. In this review, the configuration and fundamental oxygen electrochemical reactions on air cathodes are briefly introduced for Zn-air batteries first. Then, the latest bifunctional oxygen electrocatalysts are summarized in detail. Finally, the perspectives are provided for the future investigations on bifunctional oxygen electrocatalysts.

Key words: Bifunctional electrocatalysts, Oxygen-reduction reaction, Oxygen-evolution reaction, Zn-air batteries, Hybrid materials