Abstract
Oxygen evolution and oxygen reduction are considered as essential processes in the energy conversion devices.The progress of cost-effective bifunctional catalysts has become a critical issue to be solved.Here,we report that Co(OH)2@N-doped carbon (NC) was facilely synthesized through the impregnation strat-egy of metal-organic frameworks derived carbon and cobalt ions.N-doped carbon with porous structure and cobalt hydroxide nanosheets play a synergistic effect role,representing excellent catalytic perfor-mance toward oxygen evolution and reduction reactions.The obtained Co(OH)2@NC exhibits remarkable activity in terms of a lower overpotential of 330 mV@10 mA cm-2 for OER and a more positive half-wave potential (E1/2 =0.84 V) for ORR in alkaline medium,outperforming lrO2 and Pt/C.Due to its superior bifunctional catalytic performance,Co(OH)2@NC catalyst is applied into a promising air electrode of Zn-air battery.This presented strategy of impregnation synthesis in this work provides a new design direction for practical electrochemical energy devices.
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