The electrocatalytic nitrate reduction to ammonia (NRA) can address nitrogen cycle imbalance and high carbon emissions; however, the intense competition of hydrogen evolution reaction (HER) restricts the rate of NH production. Herein, amorphous NiB (a-NiB) is designed to balance the NRA and HER. The NH yield of a-NiB surpasses those of pure Ni and NiO, which is attributed to the preferential adsorption of NO on the B and Ni sites of a-NiB for the NRA reaction, greatly inhibiting the HER. Furthermore, the a-NiB possesses advantages in NRA performance compared to crystalline NiB (c-NiB) due to more active hydrogen (*H) generated during the catalytic process. The *H in the NRA process on a-NiB is verified by the electron spin resonance technique. The NRA mechanism is comprehensively discussed based on the results of characterization and density functional theory calculations. The a-NiB can enhance NH production by inhibiting HER, which provides ideas for sustainable NH synthesis.
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