Effective hydrogen evolution enabled by heterogeneous interface engineering in bimetallic sulfide with MoNi alloy

The rational construction of heterogeneous interfacial engineering presents a critical strategy for advancing efficient electrochemical water-splitting development. Here, a bimetallic sulfide-coupled MoNi alloy heterostructure catalyst (VMoS/MoNi) is synthesized via hydrothermal and sulfidation methods for high-performance alkaline water electrolysis. Benefiting from interfacial coupling within the VMoS/MoNi catalyst, the active sites are enriched, and electron transfer is promoted, leading to enhanced synergy and collaboration in electrocatalytic reactions. As a result, at 10 mA·cm⁻², the VMoS/MoNi catalyst demonstrates excellent HER (26 mV) and OER (223 mV) performance. VMoS/MoNi catalysts used as double electrode in an alkaline electrolytic assembly are noteworthy for achieving a cell voltage of 1.56 V at 10 mA·cm⁻², a significant improvement above most previously reported bifunctional electrocatalysts. This result provides further momentum for the design of heterostructure electrocatalysts, advancing the study of renewable energy conversion and storage.