Synergistically Coupled CoMoP/Cr(OH)₃ for Electrocatalytic Water Splitting

Designing cost-effective and efficient bifunctional electrocatalysts for overall water splitting is crucial for the production of renewable energy, yet still remains challenging. Herein, we report a bifunctional electrocatalyst assembled from CoMoP nanosheets and Cr(OH)₃ nanoblocks via hydrothermal and electrodeposition methods. The strong coupling interface formed between CoMoP and Cr(OH)₃ not only induces the formation of d-d orbital hybridization, exposing abundant active sites and improving charge transfer efficiency, but also accelerates the reaction kinetics, forming a stable heterostructure, thereby improving the catalytic activity and stability. Meanwhile, the prepared CoMoP/Cr(OH)₃/NF electrode demonstrates overpotentials of 88 mV for the hydrogen evolution reaction (HER) and 207 mV for the oxygen evolution reaction (OER) at 10 mA cm^-2. Remarkably, assembled CoMoP/Cr(OH)₃||CoMoP/Cr(OH)₃ requires only 1.52 V at 10 mA cm^-2, outperforming most reported advanced bifunctional catalysts. This study proposes a rapid and rational strategy for constructing novel bimetallic phosphide/hydroxide heterostructured electrocatalysts.