Efficient MnO and Co nanoparticles coated with N-doped carbon as a bifunctional electrocatalyst for rechargeable Zn-air batteries

卷:48

Article

关键词: OXYGEN REDUCTION;    HIGH-PERFORMANCE;    EVOLUTION;    CATALYST;    NANOTUBES;    HYBRID;    CATHODE;    ARRAYS;   

DOI  :  10.1016/j.ijhydene.2023.01.263

来源: SCIE

【 摘 要 】

Developing the low-cost, durable, and efficient bifunctional electrocatalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) plays an important role in the commercial implementation of the Zn-air batteries. Herein, we design and synthesize the MnO and Co nanoparticles coated with N-doped carbon (MC@NC) as an excellent bifunctional oxygen electrocatalyst. It is found that the optimal MC@NC-0.3 exhibits outstanding ORR performance with a positive half-wave potential of 0.82 V and excellent OER activity with a small overpotential of 360 mV at 10 mA cm-2. When applied in the liquid Zn-air battery, MC@NC-0.3 displays a high maximum power density of 153 mW cm-2, a large specific capacity of 776 mAh g-1 and the excellent cycling stability with a negligible increase after 300 h. Furthermore, the fiber-shaped all-solid-state Zn-air battery also displays remarkable stability at high current density. This study offers a facile strategy to construct a high-efficient, low-cost, and durable transitional metal-based bifunctional electrode for renewable energy applications.(c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free