Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (7): 1096-1101.DOI: 10.1016/S1872-2067(20)63730-5

• Communications • Previous Articles     Next Articles

In situ evolution of surface Co2CrO4 to CoOOH/CrOOH by electrochemical method: Toward boosting electrocatalytic water oxidation

Jinxiu Zhaoa,b, Xiang Rena,b, Xu Suna,b, Yong Zhanga,b, Qin Weia,b, Xuejing Liua,b,*(), Dan Wua,b,#()   

  1. aCollaborative Innovation Centre for Green Chemical Manufacturing and Accurate Detection, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, Shandong, China
    bKey Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, Shandong, China
  • Received:2020-09-15 Accepted:2020-10-29 Online:2021-07-18 Published:2020-12-10
  • Contact: Xuejing Liu,Dan Wu
  • About author:# Tel: +86-531-57307872; E-mail: wudan791108@163.com
    * Tel: +86-531-57307872; E-mail: chm_liuxj@ujn.edu.cn;
  • Supported by:
    Young Taishan Scholars Program of Shandong Province(tsqn201909124);National Natural Science Foundation of China(21775054);Project of “20 items of University” of Jinan(2019GXRC018);National Key Scientific Instrument and Equipment Development Project of China(21627809);China Postdoctoral Science Foundation(2019M652297)

Abstract:

Developing non-noble-metal electrocatalyst with efficient and durable activity is a urgent task for addressing the sluggish reaction kinetics of electrochemical water oxidation. Structural evolution of the electrocatalyst is an important strategy for achieving enhanced performance. Herein, in situ evolution of surface Co2CrO4 to CoOOH/CrOOH (CoOOH/CrOOH-Co2CrO4) by an electrochemical method under alkaline conditions was designed for enhancing the electrocatalytic performance of water oxidation. The experiments demonstrated that the synergy between CoOOH/CrOOH and Co2CrO4 resulted in a marked increase in the number of active sites and improved the rate of charge transfer, which enhanced the activity for water oxidation. At a geometrical current density of 20 mA cm-2, the overpotential of the oxygen evolution reaction was 244 mV and the turnover frequency was 0.536 s-1 in 1.0 M NaOH.

Key words: CoOOH/CrOOH-Co2CrO4 nanosheet, Anodizing evolution, Electrochemical catalysis, Oxygen evolution reaction, Turnover frequency