NiFe LDH/CuO nanosheet: a sheet-on-sheet strategy to boost the active site density towards oxygen evolution reaction

Benfeng Lin; Huafeng le; Feng Xu; Shichun Mu

doi:10.1039/d0ra02985h

NiFe LDH/CuO nanosheet: a sheet-on-sheet strategy to boost the active site density towards oxygen evolution reaction

RSC Adv. 2020 Jul 22;10(46):27424-27427. doi: 10.1039/d0ra02985h. eCollection 2020 Jul 21.

Authors

Benfeng Lin^{1

2}, Huafeng le^{1

2}, Feng Xu^{1

2}, Shichun Mu³

Affiliations

¹ College of Materials Science and Engineering, Fuzhou University Fuzhou 350108 P. R. China xufeng.mater@fzu.edu.cn.
² Key Laboratory of Eco-materials Advanced Technology, Fuzhou University 350108 P. R. China.
³ State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology Wuhan 430070 P. R. China msc@whut.edu.cn.

Abstract

The amount of active sites of a catalyst is of great importance to enhance the oxygen evolution reaction (OER) activity. Here, the sheet-on-sheet strategy is proposed to effectively increase the density of active sites of NiFe layered double hydroxide (NiFe LDH) catalyst in terms of structural engineering. As a non-precious electrocatalyst for the OER, NiFe LDH is grown directly on CuO nanosheets. As a result, the received NiFe LDH/CuO nanosheet catalyst with sheet-on-sheet structure shows an ultralow overpotential of 270 mV at 20 mA cm^-2, much lower than that of RuO₂ as a benchmark. The CuO nanosheets, as substrate, play the vital role in downsizing the NiFe LDH, leading to the raised active site density.