期刊
ACS NANO
卷 13, 期 6, 页码 7062-7072出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b02315
关键词
bifunctional catalysts; oxygen electrocatalysis; nanostructure design; defective carbon; Zn-air batteries; long-term cyclability
类别
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- University of Waterloo, Waterloo Institute for Nanotechnology
- Canadian Centre for Electron Microscopy at McMaster University
The poor durability of bifunctional oxygen electrocatalysts is one main bottleneck that suppresses the widespread application of rechargeable metal-air batteries. Herein, a ship in a bottle design is achieved by impregnating fine transition metal dichalcogenide nanoparticles into defective carbon pores that act as interconnected nanoreactors. The erected 3D porous conductive architecture provides a highway for expediting charge and mass transfer. This design not only delivers a high surface-to-volume ratio to increase numbers of exposed catalytic sites but also precludes nanoparticles from aggregation during cycling owing to the pore spatial confinement effect. Therefore, the long-term plague inherent to nanocatalyst stability can be solved. Moreover, the synergistic coupling effects between defect-rich interfaces and chemical bonding derived from heteroatom-doping boost the catalytic activity and prohibit the detachment of nanoparticles for better stability. Consequently, the developed catalyst presents superior bifunctional oxygen electrocatalytic activities and durability, out-performing the best-known noble-metal benchmarks. In a practical application to rechargeable Zn-air batteries, long-term cyclability for over 340 h is realized at a high current density of 25 mA cm(-2) in ambient air while retaining an intact structure. Such a universal ship in a bottle design offers an appealing and instructive model of nanomaterial engineering for implementation in various fields.
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