The chrysanthemum-like CoMoO4-Ni3V/NF heterostructure electrocatalyst for hydrogen evolution reaction

To economically exploit hydrogen energy, it is extremely urgent to design hydrogen evolution reaction (HER) electrocatalysts with fast electron transfer rates and large catalytically specific surface areas. We synthesized a chrysanthemum-like CoMoO4-Ni3V/NF electrocatalyst by an uncomplicated one-pot hydrothermal method. The optimized CoMoO4-Ni3V(1)/NF heterostructure electrocatalyst delivers 10 mA cm-2 at a very low overpotential of only 48 mV and a small Tafel slope of 82.1 dec-1 in 1.0 M KOH solution for HER. Moreover, the electrocatalyst has outstanding stability after 1000 CV cycles and a long-term test for 48 h. The chrysanthemum-like architecture that maximizes active site exposure and facilitates rapid mass/charge transport. Concurrently, the atomic-level synergy between the CoMoO4-Ni3V heterointerface and V-doping induces interfacial electron redistribution, which not only optimizes the electronic configuration but also improves bulk conductivity. This work establishes a paradigm for "morphology-electronic" dual regulation in catalyst design, offering a scalable industrial solution through its cost-effective synthesis and exceptional performance.