Hollow Raspberry-like CoS x /C Sub-Microspheres as a Highly Active Air Cathode Catalyst for Rechargeable Zinc-Air Batteries

作者：You, Chenghang; Gao, Xiaohong; Wang, Xianghui; Tian, Xinlong^*; Wu, Daoxiong^*; Li, Xiaobao; Liao, Shijun; Wang, Qingqing^*

来源：ACS Sustainable Chemistry & Engineering, 2023, 11(27): 9956-9964.

DOI：10.1021/acssuschemeng.3c00322

• raspberry-like morphology
• hollow CoS x
• C sub-microspheres
• high-performance bifunctionalelectrocatalysts
• oxygen reduction
• oxygen evolution
• zinc-air battery

Rechargeablezinc-air batteries (ZABs) are considered one of themost promising energy devices owing to their high theoretical capacity,environmental friendliness, low cost, and high safety. However, theirpractical applications are still limited by the lack of low cost,high activity, and stable air cathode catalysts toward both the oxygenreduction reaction (ORR) and the oxygen evolution reaction (OER).In this study, hollow, raspberry-like CoS x /C sub-microspheres were designed and fabricated. The synthesizedcatalyst exhibited high catalytic performance toward both the ORRand OER, requiring a half-wave potential of 0.87 V for the ORR andan ultralow overpotential of 160 mV to achieve 10 mA cm(-2) for the OER. When used as an air cathode catalyst, it provided aZAB with a maximum power density of 341.9 mW cm(-2) and exhibited excellent cycling stability. After continuous andsteady operation for 1000 cycles (corresponding to 333.3 h) at 5 mAcm(-2), no obvious decay in performance was observed.The catalyst's high performance and stability will make itfind its potential use in practical and commercial applications. Also,the present strategy can be easily translated to the rational designingand fabrication of bifunctional oxygen catalysts with both high activityand stability for ZABs and other eco-friendly and future-orientedenergy techniques. @@@ Inthis study, hollow, raspberry-like CoS x /C sub-microspheres were designed and fabricated.

• 单位
  海南大学; 海南师范大学