Electronic regulation of a core–shell NiSe2 catalyst by Co doping to accelerate hydrogen evolution

A Co-doping core–shell shaped NiSe 2 based catalyst (Ni x Co 1− x Se 2 @NC) exhibits promising electrocatalytic activity for HER with a low overpotential of −143 mV at −10 mA cm −2 , a small Tafel slope of 37.5 mV dec −1 .