Bifunctional CoO/CoS2 hierarchical nanospheres electrocatalyst for rechargeable Zn-Air battery

作者：Qin, Tiansheng; Ding, YaoYao; Zhang, Rongfang; Gao, Xiaoping; Tang, Zhenghua; Liu, Yonggang^*; Gao, Daqiang

来源：FlatChem, 2022, 32: 100343.

DOI：10.1016/j.flatc.2022.100343

• Heterostructures
• CoO/CoS2
• OER
• ORR
• Zn-air battery

Limited by sluggish kinetics of oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), exploring low-cost nonprecious materials to replace precious catalysts is urgently desired for the commercialization of efficient rechargeable Zn-air batteries. Herein, a rationally designed oxide/sulfide heterostructures, which named as CoO/CoS2, are successfully realized. Benefited from the electrons interaction between multiple components at the heterojunction interface and the defect structure, the CoO/CoS2 displays highly effective bifunctional cata-lytic performance and robust durability. CoO/CoS2 expresses a truncated overpotential of 320 mV at 10 mA cm(-1) for OER, a half-wave potential of 0.78 V for ORR, and a potential difference of approximately 0.78 V. For practical application, the assembled aqueous Zn-air battery with CoO/CoS2 as the air cathode displays a large open-circuit voltage of 1.40 V, a high power density (84 mW cm(-2)) and superb charge-discharge stability. This work illustrates the great application prospects of CoO/CoS2 as a next-generation power source device.

• 单位
  1; 兰州大学