Construction ofTransition Metal-Based MoNi₄/WO₃ Heterostructurefor Enhanced Hydrogen Evolution Reaction

The metal/metal oxide heterostructured electrocatalysts provide a potential solution for enhancing hydrogen evolution reaction (HER) performance by regulating their surface/interface electronic structure and optimizing the interfacial adsorption/desorption of reaction intermediates. By introducing Mo into a Ni and W-containing electrolyte, crystalline MoNi₄ phases are induced during electrodeposition, constructing a filamentous porous MoNi₄/WO₃ heterostructure on a stainless steel mesh substrate. The incorporation of Mo improves the crystallinity of the catalyst surface, promoting charge transfer. The MoNi₄/WO₃ heterostructure facilitates the generation of abundant defect sites and oxygen vacancies, optimizing processes such as the adsorption, transfer, and desorption of H* at metal active sites, thereby significantly enhancing the electrocatalytic kinetics for HER. A stability test conducted at 100 mA cm^–2 for 24 h showed minimal change in HER performance. This work provides a new approach for designing and constructing high-performance non-noble metal-based heterostructured electrocatalysts with great potential for future applications.