Nano-manufacturing of Co(OH)2@NC for efficient oxygen evolution/reduction reactions

• 作者: Guanglu Li Chang Liu Zhao Zhang Baihua Cui Yanan Chen Yida Deng Wenbin Hu
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（22）
• 页码范围: 131-138
• 页数: 8页
• 语种: 英文

摘要

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.