Hydrogen evolution boosted by moderate Co3ZnC with current densities beyond 1000 mA cm−2

Co3ZnC can efficiently boost the activity of Co@N, O co-doped carbons for hydrogen evolution. The results show that moderate Co3ZnC plays key roles in achieving an appropriate weighted Co 3d band centre, enhancing charger transfer and thus optimizing the electrochemical active surface area. Thus, a low overpotential of ∼219 mV can drive a high current density of 1000 mA cm-2 under the favourable condition of moderate Co3ZnC.