Abstract
Oxygen evolution reaction(OER),occurring at the anode of electrochemical water splitting requires a comprehensive understanding of oxygen electrocatalysis mechanism to optimize its efficiency.Atomically dispersed transition metal supported by nitrogen-doped carbon is featured with excellent catalytic per-formance.Herein,we report a Mg/Co bimetal site which utilizes Mg 3p electrons with strong binding of*OH(the first key reaction intermediates in the free energy diagram)to trigger the OER reaction and Co 3d itinerant character to regulate the binding strength of*O.Benefiting from the fine-tuned adsorp-tion/desorption possesses,the optimized catalyst delivers superior OER activity with low overpotential,i.e.,310 mV at a current density of 10mA/cm2 and 455 mV at 100mA/cm2.Moreover,the current density is able to be maintained at 10mA/cm2 for 10h,consistent with the theoretical simulations for oxidiza-tion process,which demonstrates stable configurations after multiple*OH modification,revealing robust applicability in alkaline medium.
维普
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