Synergized Ni/NiOx heterojunction encapsulated by N-doped graphitized carbon core@shell electrocatalyst for efficient hydrogen production

In this paper, based on the self-assembly of nickel glycinate, the Ni/NiOx heterojunction encapsulated by nitrogen-doped graphitized carbon shells (Ni/NiOx@NC) was prepared via two facile steps for hydrogen pro-duction. Attributed to the synergistic catalysis of the well-proportioned Ni/NiOx heterojunction, the accelerated electron transport and the protective effect of the NC layers, the prepared Ni/NiOx@NC catalysts exhibited good electrocatalytic performance, with a minimum overpotential of 173 mV (vs RHE) at the current density of 10 mA cm-2 in 1 M KOH and the slight performance degradation after continuous cyclic voltammetry sweeps for 6000 cycles.