Efficient Self‐Supported Bifunctional NiMo Alloy Electrocatalysts for Water Splitting in Alkaline Environment

Abstract Hydrogen attracts researchers′ attention because its combustion products are very clean and will not pollute the environment. Electrocatalytic water splitting is a sustainable hydrogen energy production technology, which splits water into hydrogen and oxygen. In electrocatalytic water splitting, high activity catalysts can reduce the potential barrier of catalytic reaction and speed up the reaction, among which transition metal alloy catalysts have attracted extensive attention in the application of electrocatalysis due to their excellent electrochemical activity, stability and easy preparation. In this paper, the NiMoO 4 precursor was firstly synthesized by the facile hydrothermal reaction, and then the self‐supported NiMo alloy was synthesized by annealing. The results indicate that NiMo alloy has efficient hydrogen evolution activity (34 mV) and oxygen evolution activity (279 mV) at 10 mA cm −2 . More importantly, the water splitting system consisting of NiMo alloys demonstrates excellent performance and stability. At 10 mA cm −2 , the voltage is 1.489 V, and it can be stable for at least 10 hours at 70 mA cm −2 . This study can provide some ideas for the study of water splitting electrocatalysts.