Engineering Ni(OH)₂ Nanosheet on CoMoO₄ Nanoplate Array as Efficient Electrocatalyst for Oxygen Evolution Reaction

The exploration of earth-abundant and high-efficiency electrocatalysts for water oxidation is of great significance for sustainable energy conversion. Co–Mo-based bimetallic oxides are considered as promising candidates for the oxygen evolution reaction (OER) due to their high intrinsic activity and low cost. In this work, we reported an interfacial engineering design of CoMoO 4 nanoplate arrays wrapped with Ni(OH) 2 nanosheets supported on Ni foam for high-performance OER. Remarkably, benefiting from the hierarchical heterostructure arrays with strong interfacial interaction, enlarged surface areas, and more active sites, the optimized CoMoO 4 -Ni(OH) 2 electrocatalyst manifests the excellent OER catalytic performance with a low overpotential of 349 mV at the current density of 100 mA cm –2, a long-term stability, and high (nearly 100%) Faradaic efficiency, which is superior to those of most previously reported Co–Mo-based bimetallic oxides electrocatalysts. Therefore, this interfacial engineering demonstrates an effective strategy for designing and fabricating high-performance electrocatalysts for OER reaction.