Chinese Journal of Catalysis ›› 2023, Vol. 54: 290-297.DOI: 10.1016/S1872-2067(23)64533-4

• Articles • Previous Articles    

Metal-organic framework-derived cation regulation of metal sulfides for enhanced oxygen evolution activity

Kai Wana,b, Jiangshui Luoc,*(), Wenbo Liua, Ting Zhangd, Jordi Arbiold,e,*(), Xuan Zhangb, Palaniappan Subramanianb, Zhiyong Fua,*(), Jan Fransaerb,*()   

  1. aGuangdong Provincial Key Laboratory of Fuel Cell Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, Guangdong, China
    bDepartment of Materials Engineering, KU Leuven, Leuven 3001, Belgium
    cEngineering Research Center of Alternative Energy Materials & Devices, Ministry of Education, College of Materials Science and Engineering, Sichuan University, Chengdu 610065, Sichuan, China
    dCatalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, Barcelona 08193, Catalonia, Spain
    eICREA, Pg. Lluís Companys 23, Barcelona08010, Catalonia, Spain
  • Received:2023-08-15 Accepted:2023-10-11 Online:2023-11-18 Published:2023-11-15
  • Contact: *E-mail: jiangshui.luo@scu.edu.cn (J. Luo), arbiol@icrea.cat (J. Arbiol),zyfu@scut.edu.cn (Z. Y. Fu), jan.fransaer@kuleuven.be (J. Fransaer).
  • Supported by:
    National Natural Science Foundation of China(21975081);National Natural Science Foundation of China(22178126);National Natural Science Foundation of China(22208110);National Natural Science Foundation of China(21776120);National Natural Science Foundation of China(22378270);Science and Technology Program of Guangzhou(2023A04J1357);China Postdoctoral Science Foundation(2022M711196);Open Project of Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education, Sichuan University(AEMD202204);Sichuan Science and Technology Program(2022ZYD0016);Sichuan Science and Technology Program(2023JDRC0013);Hohhot Science and Technology Program(2023-JieBangGuaShuai-Gao-3);Natural Science Foundation of Fujian Province, China(2023J01254);Research Fund Program of Guangdong Provincial Key Laboratory of Fuel Cell Technology(FC202206);Research Fund Program of Guangdong Provincial Key Laboratory of Fuel Cell Technology(FC202218)

Abstract:

Heteroatom doping serves as an important strategy to improve the oxygen evolution reaction (OER) activity of transition-metal compounds, while the investigation of intrinsic active sites and mechanisms remains insufficient. In this work, a facile cation regulation strategy is reported to boost the OER activity of metal sulfides via pyrolysis of the Ni-Co bimetallic metal-organic framework. The obtained Ni-substituted CoS nanoparticles on nitrogen-doped mesoporous carbon (Ni-CoS/NC) catalyst achieves a current density of 10 mA cm-2 at a small overpotential of 270 mV with a Tafel slope of 37 mV dec-1 in 1.0 mol L-1 KOH. Through a combination of spectroscopy study and theoretical computations, the activity origin is revealed at the atomic level. The CoxNi1-xOOH serves as the real active site for the OER generated by the Ni-CoS/NC reconstruction under oxidation potential during OER. The Ni substitution results in a strong electronic interaction between the two metals, thus generating more negatively charged Co atoms and more positively charged Ni atoms in the electrocatalyst. The metal sites with regulated electronic structure exhibit enhanced surface adsorption of OOH* and reduce the OER overpotential. Meanwhile, the conductive porous carbon scaffold facilitates electron transfer, mass diffusion, and the accessibility of active sites. This work not only provides a feasible cation regulation strategy for the design of high-performance electrocatalysts for low-cost energy storage and conversion systems, but also yields fresh insight into the activity enhancement mechanisms and intrinsic active sites.

Key words: Metal-organic framework, Cation regulation, Metal sulfide, Metal oxyhydroxide, Oxygen evolution reaction