Boosting Electrocatalytic Durability and Full Water Splitting Efficiency of CoMoO4 via Strategic CeO2 decoration

Abstract

Fabricating hybrid electrocatalysts with optimized full water splitting performance is crucial for hydrogen generation by means of water electrolysis. In this investigation , a CoMoO4/CeO2-CP hybrid structure was engineered for alkaline water splitting through a facile strategy: CoMoO₄ nanosheets were first obtained by hydrothermal synthesis linked with further heat treatment, then were electro-deposited by CeO2 nanoparticles. The decoration of CeO2 nanoparticles onto CoMoO₄ nanosheets enabled the catalyst to exhibit excellent bifunctional performance in KOH (Concentration is 1M), achieving low overpotentials of HER (114 mV) and OER (305 mV) at 10 mA cm−2. Furthermore, this CoMoO₄/CeO₂-based electrolyzer required 1.67 V for achieving 10 mA cm−2 during overall water electrolysis evaluations. Notably, the optimized hybrid catalyst demonstrated significantly long-term stability in alkaline media.