▎ 摘　　要

MoS2 exhibits good prospectsin electrocatalytic hydrogenevolution. Whereas, the electrocatalytic property of MoS2 is restrained by its insufficient active sites, low electrical conductivity,and slow water dissociation processes. Herein, an aerogel composedof silicon carbide (SiC) and graphene (SiCnw-RGO) was constructedby growing SiC nanowires (SiCnw) in the graphene aerogel (RGO) viathe CVD method, and then Ni-Mo-S nanosheets were hydrothermallysynthesized on the SiCnw-RGO composite aerogel to develop anefficient pH-universal electrocatalyst. Ni-Mo-S nanosheetssupported on SiCnw-RGO (Ni-Mo-S@SiCnw-RGO)exhibit an interesting hierarchical three-dimensional interconnectedstructure of composite aerogel. The optimal Ni-Mo-S@SiCnw-RGOelectrocatalyst exhibits excellent catalytic performance with lowTafel slopes of 60 mV/dec under acidic conditions and 90 mV/dec underalkaline conditions. Density functional theory calculations demonstratea composite catalyst exhibits advantageous hydrogen adsorption freeenergy and water dissociation energy barrier. This study providesa reference to design an efficient hierarchical aerogel electrocatalyst.