Hydrogen evolution boosted by moderate CoZnC with current densities beyond 1000 mA cm

Co 3 ZnC can efficiently boost the activity of Co@N, O co-doped carbons for hydrogen evolution. The results show that moderate Co 3 ZnC 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 Co 3 ZnC. Moderate Co 3 ZnC efficiently boosts hydrogen evolution with a high current density of 1000 mA cm −2 at a low overpotential of 219 mV via tuning the Co 3d bands, enhancing charge transfer and thus enlarging the electrochemical active surface area.