In situ growth of Mo-CoFe LDH on nickel foam for efficient oxygen evolution reaction

Abstract

The study of non-precious metals to prepare catalytic materials with high performance and excellent stability is an important part of improving hydrogen production by electrolysis of water. In this work, we report on the preparation of direct composite Mo-CoFe LDH/NF as the working electrode of oxygen evolution reaction (OER) using nickel foam as the substrate via one-step hydrothermal method. The direct growth in situ ensured the close contact between LDH and NF substrate, thereby reducing the charge transfer resistance and making the electrode have high electrocatalytic performance. At the current density of 10 mA·cm−2, the oxygen evolution overpotential of the Mo-CoFe LDH/NF catalytic material was 252 mV, the Tafel slope was 22.07 mV/dec, and the material could be maintained in alkaline solution for 10 h, showing good stability. Therefore, this work proposed new ideas for the design and fabrication of low-cost and efficient electrocatalyst materials.