Rough Ni@MoN corals for the hydrogen evolution reaction in acidic and alkaline media

Ni@MoN catalysts were prepared by reducing NiMoO 4 nanorods with urea at high temperatures. The resultant Ni@MoN-700 exhibits great HER activity, with a low overpotential of 30 mV and 76 mV at 10 mA cm −2 in alkaline and acidic media.