Assembling 2D Ni‐Co nanosheets onto Mo₂C Nanorod towards Efficient Electrocatalytic Hydrogen Evolution†

Comprehensive Summary A novel electrocatalyst, Ni‐Co/β‐Mo 2 C@C, was rationally designed to enhance the efficiency of the hydrogen evolution reaction (HER) in this work. Assembled with two‐dimensional Ni‐Co nanosheets onto Mo 2 C nanorods coated with a thin carbon shell, the catalyst demonstrates remarkable performance, including low overpotential ( η 10 = 57 mV) and reduced Tafel slope (63 mV·dec –1 ) in 0.5 mol·L –1 H 2 SO 4 electrolyte. This innovative design strategy provides abundant active sites and efficient electron/ion transport pathways, effectively shortening reactant diffusion distances and enhancing electrocatalytic activity. Additionally, the carbon shell coating protects the catalyst from etching and agglomeration, ensuring its durability. This work presents a promising approach for engineering highly efficient metal carbide‐based HER catalysts through tailored composition and nanostructure design.