J. Mater. Sci. Technol. ›› 2021, Vol. 81: 131-138.DOI: 10.1016/j.jmst.2020.11.061

• Research Article • Previous Articles     Next Articles

Nano-manufacturing of Co(OH)2@NC for efficient oxygen evolution/reduction reactions

Guanglu Lia, Chang Liua, Zhao Zhanga, Baihua Cuia, Yanan Chena,*(), Yida Denga,*(), Wenbin Hua,b   

  1. aSchool of Materials Science and Engineering, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300072, China
    bJoint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou, 350207, China
  • Received:2020-09-01 Revised:2020-11-24 Accepted:2020-11-27 Published:2021-01-07 Online:2021-01-07
  • Contact: Yanan Chen,Yida Deng
  • About author:yida.deng@tju.edu.cn(Y. Deng).
    *E-mail addresses: yananchen@tju.edu.cn (Y. Chen),

Abstract:

Oxygen evolution and oxygen reduction are considered as essential processes in the energy conversion devices. The progress of cost-effective bifunctional catalysts has become a critical issue to be solved. Here, we report that Co(OH)2 @N-doped carbon (NC) was facilely synthesized through the impregnation strategy of metal-organic frameworks derived carbon and cobalt ions. N-doped carbon with porous structure and cobalt hydroxide nanosheets play a synergistic effect role, representing excellent catalytic performance toward oxygen evolution and reduction reactions. The obtained Co(OH)2@NC exhibits remarkable activity in terms of a lower overpotential of 330 mV@10 mA cm-2 for OER and a more positive half-wave potential (E1/2 = 0.84 V) for ORR in alkaline medium, outperforming IrO2 and Pt/C. Due to its superior bifunctional catalytic performance, Co(OH)2@NC catalyst is applied into a promising air electrode of Zn-air battery. This presented strategy of impregnation synthesis in this work provides a new design direction for practical electrochemical energy devices.

Key words: Co(OH)2, Metal-organic framework, Electrocatalyst, Oxygen evolution reaction, Oxygen reduction reaction