Electronic Redistribution: Construction and Modulation of Interface Engineering on CoP for Enhancing Overall Water Splitting

Abstract Modulating and constructing interface engineering is an efficient strategy to enhance catalytic activity for water splitting. Herein, a hybrid nanoarray structure of V‐CoP@a‐CeO 2 , where “a” represents amorphous, integrated into carbon cloth is fabricated for water splitting. The synergy effect between V and CeO 2 can increase the electron density of Co atoms at active sites, further optimizing the Gibbs free energy of H* adsorption energy (Δ G H* ). Besides, V‐CoP@a‐CeO 2 possesses lower water adsorption/dissociation energies, enabling accelerated reaction kinetics in alkaline media. As expected, the V‐CoP@a‐CeO 2 exhibits superior performance toward the hydrogen evolution reaction and the oxygen evolution reaction. More importantly, a two‐electrode electrolyzer combined with an electrocatalyst of V‐CoP@ a‐CeO 2 only demands that voltages of electrolytic cell are 1.56 and 1.71 V to achieve the current densities of 10 and 100 mA cm −2 , respectively. This work provides guidance for the design or optimization of materials for water electrolysis and beyond.