Nano bowl-like cobalt-cobalt molybdenum carbide coated by N,P co-doped carbon as an advanced bifunctional oxygen electrocatalyst for rechargeable Zn-air batteries

Yanqiang Li; Huicheng Wang; Hai An; Xuan Liu; Siru Chen; Xue-Zhi Song

doi:10.1039/d3dt00632h

Nano bowl-like cobalt-cobalt molybdenum carbide coated by N,P co-doped carbon as an advanced bifunctional oxygen electrocatalyst for rechargeable Zn-air batteries

Dalton Trans. 2023 May 16;52(19):6254-6259. doi: 10.1039/d3dt00632h.

Authors

Yanqiang Li¹, Huicheng Wang¹, Hai An¹, Xuan Liu², Siru Chen³, Xue-Zhi Song²

Affiliations

¹ School of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450045, China. lyqncwu@126.com.
² State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Panjin 124221, China. songxz@dlut.edu.cn.
³ School of Material and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou, 450007, China.

PMID: 37157970
DOI: 10.1039/d3dt00632h

Abstract

Nano bowl-like Co-Co₆Mo₆C₂ coated by N,P co-doped carbon (Co-Co₆Mo₆C₂@NPC) is reported as an electrocatalyst for Zn-air batteries. Co-Co₆Mo₆C₂@NPC only needs an overpotential of 210 mV at 10 mA cm^-2 for the OER, and the half-wave potential for the ORR is 0.81 V. In addition, the Co-Co₆Mo₆C₂@NPC based battery shows a large open-circuit voltage of 1.335 V and a maximum power density of 160.5 mW cm^-2, as well as good stability. The improved catalytic performance can be ascribed to the co-existence of Co₆Mo₆C₂ and Co species to improve the intrinsic catalytic activity, and the bowl-like nanostructure to facilitate the mass transfer.