Issue

Vol. 15 (2023)

Aerophilic Triphase Interface Tuned by Carbon Dots Driving Durable and Flexible Rechargeable Zn-Air Batteries

https://doi.org/10.1007/s40820-022-00994-3
Kuixing Ding
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China
Yu Ye
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China
Jiugang Hu
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China
Liming Zhao
College of Standardization, China Jiliang University, Hangzhou 310018, People’s Republic of China
Wei Jin
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, People’s Republic of China
Jia Luo
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China
Shan Cai
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China
Baicheng Weng
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China
Guoqiang Zou
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China
Hongshuai Hou
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China
Xiaobo Ji
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People’s Republic of China

Corresponding Author: Hongshuai Hou

hs-hou@csu.edu.cn

Nano-Micro Letters, Vol. 15 (2023), Article Number: 28

Abstract

Efficient bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are vital for rechargeable Zn-air batteries (ZABs). Herein, an oxygen-respirable sponge-like Co@C–O–Cs catalyst with oxygen-rich active sites was designed and constructed for both ORR and OER by a facile carbon dot-assisted strategy. The aerophilic triphase interface of Co@C–O–Cs cathode efficiently boosts oxygen diffusion and transfer. The theoretical calculations and experimental studies revealed that the Co–C–COC active sites can redistribute the local charge density and lower the reaction energy barrier. The Co@C–O–Cs catalyst displays superior bifunctional catalytic activities with a half-wave potential of 0.82 V for ORR and an ultralow overpotential of 294 mV at 10 mA cm−2 for OER. Moreover, it can drive the liquid ZABs with high peak power density (106.4 mW cm−2), specific capacity (720.7 mAh g−1), outstanding long-term cycle stability (over 750 cycles at 10 mA cm−2), and exhibits excellent feasibility in flexible all-solid-state ZABs. These findings provide new insights into the rational design of efficient bifunctional oxygen catalysts in rechargeable metal-air batteries.


Highlights:


1 Oxygen-respirable sponge was constructed by carbon dots-assisted synthesis strategy.
2 The hydrophilicity and aerophilicity of Co@C–O–Cs active sites boost oxygen diffusion and the bifunctional oxygen reduction reaction and oxygen evolution reaction activities.
3 Co@C–O–Cs-based Zn-air battery (ZAB) displays excellent specific capacity and stability, and the all-solid-state Co@C–O–Cs-based ZAB exhibits excellent flexibility.

Keywords

Aerophilic triphase interface Oxygen-rich active sites O2 diffusion Bifunctional oxygen catalyst Flexible rechargeable Zn-air battery
Ding, Kuixing, Yu Ye, Jiugang Hu, Liming Zhao, Wei Jin, Jia Luo, Shan Cai, Baicheng Weng, Guoqiang Zou, Hongshuai Hou, and Xiaobo Ji. 2023. “Aerophilic Triphase Interface Tuned by Carbon Dots Driving Durable and Flexible Rechargeable Zn-Air Batteries”. Nano-Micro Letters 15 (January):28. https://doi.org/10.1007/s40820-022-00994-3.
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