Construction and modulation of Co2P/MoP/CC heterojunction with porous octahedral structure to improve the Overall Water Splitting capacity

Designing efficient water splitting electrocatalysts in alkaline electrolytes is crucial but also presents significant challenges. In this study, Co 2 P/MoP/CC catalysts were synthesized using a hydrothermal method and in situ phosphorization with carbon cloth as the substrate. This unique porous octahedral structure features large specific surface area, exposing more active sites and aiding in bubble transportation. At a current density of 10 mA/cm², the overpotentials for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are 86 mV and 280 mV, respectively. This excellent performance is attributed to the formation of a Co 2 P/MoP heterojunction, which promotes electron transfer and enhances the adsorption strength of intermediates. In the overall water splitting experiment, only a low potential of 1.65 V is required to reach 10 mA/cm² and maintain stability for 100,000 seconds. This study offers a novel strategy for the development of efficient water electrolysis catalysts.