CoNi Nanoalloys @ N-Doped Graphene Encapsulated in N-Doped Carbon Nanotubes for Rechargeable Zn-Air Batteries

被引:36
作者
Zhu, Zhaogen [1 ]
Xu, Qianqun [1 ]
Ni, Zhaotong [1 ]
Luo, Kaifen [1 ]
Liu, Yiyi [1 ]
Yuan, Dingsheng [1 ]
机构
[1] Jinan Univ, Sch Chem & Mat Sci, Guangzhou 510632, Peoples R China
来源
ACS SUSTAINABLE CHEMISTRY & ENGINEERING | 2021年 / 9卷 / 40期
基金
中国国家自然科学基金;
关键词
CoNi nanoalloys; N-doped carbon nanotubes; bifunctional electrocatalysts; stability; all-solid-state; Zn-air batteries; METAL-ORGANIC FRAMEWORK; ALLOY NANOPARTICLES; CATHODE CATALYSTS; ELECTROCATALYST; ELECTRODE; PLATINUM; PROGRESS;
D O I
10.1021/acssuschemeng.1c04259
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Exploring cost-effective and durable bifunctional oxygen electrocatalysts for oxygen reduction and oxygen evolution reactions (ORR and OER) is critical for the commercial implementation of rechargeable Zn-air batteries but remains as an immense challenge. Herein, CoNi nanoalloys wrapped with N-doped graphene embedded into N-doped carbon nanotubes (CN@NC) have been prepared by a universal two-step pyrolysis method. The optimal CN@NC-2-800 affords a positive half-wave potential of 0.83 V for ORR and a small overpotential of 400 mV at 10 mA cm(-2) for OER, outperforming most of the current non-precious bifunctional oxygen electrocatalysts. Expectedly, the liquid Zn-air battery based on CN@NC-2-800 displays a high open-circuit voltage of 1.52 V, a large peak power density of 172 mW cm(-2), and a long cycle life of 300 h. Furthermore, the developed all-solid-state Zn-air battery also shows remarkable stability with various degrees of bending. This work offers a simple and effective way to explore highly efficient and durable electrocatalysts for renewable energy applications.
引用
收藏
页码:13491 / 13500
页数:10
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