Precursor-converted formation of bimetallic–organic framework nanosheets for efficient oxygen evolution reaction

Abstract

The design and preparation of outstanding catalysts are significant for the electrocatalytic oxygen evolution reaction (OER), which performs a crucial function in electrochemical water splitting. Herein, we have prepared metal–organic framework (MOF) nanosheets on a nickel foam (NF) substrate via a two-step procedure including a hydrothermal reaction and an in situ transformation process. As for the anodic OER process, the obtained NiFe-MOF@NF demonstrates excellent catalytic performance with a small overpotential of 265 mV to reach a current density of 10 mA cm⁻², and impressive long-term catalytic durability and stability without obvious deactivation. The superior electrocatalytic performance of the obtained NiFe-MOF@NF material is mainly due to the substantial active metal centres, enhanced electrical conductivity and favorable kinetics. We believe that the strategy will be of great benefit to the development of highly efficient metal electrocatalysts, and will pave the way for the application of metal catalysts in the OER.