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Atomically thin metallic Ni3N nanosheets fabricated as the hydrogen evolution cathode exhibit remarkable HER activity close to that of a commercial Pt/C electrode. The Ni atoms accompanied by surrounding N atoms on the N–Ni surface demonstrate a small ΔGH* of 0.065 eV due to the Ni–N co-effect, and thus act as the most active HER sites.
Gao et al. (Fri,) studied this question.