Hofmann-type Metal-Organic Framework Based Bimetal/Carbon Nanosheets for Efficient Electrocatalytic Oxygen Evolution

The development of efficient oxygen evolution reaction (OER) catalyst is the key to solve the slow reaction kinetics and is of great significance for the conversion and storage of renewable energy. In this paper, bimetallic/carbon nanosheets electrocatalysts were prepared by high temperature carbonization using Hofmann-type metal-organic frameworks (MOFs) as precursors. It is worth noting that in this study, the morphology and structure of the catalyst was successfully adjusted by surfactant, and the Co/Fe-Dpyz@CNC (1000) catalyst obtained has a large specific surface area (316.3 m(2)/g) and rich exposed active centers. In addition, the coupling effect of Co and Fe bimetal optimizes the electronic structure of the graphite layer and enhances the conductivity of the catalyst. Co/Fe-Dpyz@CNC (1000) shows excellent OER performance, the overpotential is 318 mV@10 mA cm(-2), and the Tafel slope is very small in 1 M KOH, which is 62.8 mV dec(-1). The results show that bimetal/carbon nanosheets are potential catalysts for OER.