Transition metal oxides (TMOs) have acquired much attention on account of their abundant reserves and variable components, but sluggish charge transfer rate, limited electrochemically active sites, and poor conductivity hamper their extensive applications in the hydrogen evolution reaction (HER). Herein, we have synthesized nitrogen-doped CoMoO 4 clusters constituted of nanosheets directly supported on nickel foam (N-CoMoO 4 /NF) by combining a hydrothermal process and lowtemperature ammonia annealing treatment. Experimental results reveal that the nitrogen doping can modulate the electronic structure of CoMoO 4 , in which Mo ions with +6 valence are reduced to a lower state, and thus enhance its catalytic performance for HER. The optimized N-CoMoO 4 /NF (N-CoMoO 4 /NF-1, with the annealing time of 1 h in NH 3 atmosphere) exhibits excellent activity toward alkaline HER, requiring an overpotential of 58 mV at 10 mA/cm 2 . This work possesses great potential for promoting alkaline HER performance of TMOs by the facile process of nitrogen doping.

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