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 strategy 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 performance 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 (E_1/2 = 0.84 V) for ORR in alkaline medium, outperforming IrO₂ 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.

在能量转换装置中，放氧和氧还原被认为是必不可少的过程。具有成本效益的双功能催化剂的进展已成为要解决的关键问题。在这里，我们报告Co（OH）₂ @N掺杂的碳（NC）是通过金属-有机骨架衍生的碳和钴离子的浸渍策略轻松合成的。具有多孔结构的N掺杂碳和氢氧化钴纳米片起协同作用的作用，表现出对氧释放和还原反应的出色催化性能。所获得的Co（OH _）2 @NC表现出显着的活性，这是因为对于OER而言，较低的过电势为330 mV @ 10 mA cm ^-2，而半波电势则为正值（E _1/2碱性介质中的ORR等于0.84 V），优于IrO ₂和Pt / C。由于其优异的双功能催化性能，Co（OH）₂ @NC催化剂被应用于有前景的Zn-空气电池的空气电极中。在这项工作中提出的浸渍合成策略为实际的电化学能量装置提供了新的设计方向。