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Hierarchically Designed 3D Holey C2N Aerogels as Bifunctional Oxygen Electrodes for Flexible and Rechargeable Zn-Air Batteries

Title
Hierarchically Designed 3D Holey C2N Aerogels as Bifunctional Oxygen Electrodes for Flexible and Rechargeable Zn-Air Batteries
Author
이상욱
Keywords
holey C2N; bifunctional oxygen electrocatalyst; liquid and solid-state Zn-air batteries; Li-O-2 battery; density functional theory
Issue Date
2018-01
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v. 12, no. 1, page. 596-608
Abstract
The future of electrochemical energy storage spotlights on the designed formation of highly efficient and robust bifunctional oxygen electrocatalysts that facilitate advanced rechargeable metal-air batteries. We introduce a scalable facile strategy for the construction of a hierarchical three-dimensional sulfur-modulated holey C2N aerogels (S-C(2)NA) as bifunctional catalysts for Zn-air and Li-O-2 batteries. The S-C(2)NA exhibited ultrahigh surface area (4943 m(2) g(-1)) and superb electrocatalytic activities with lowest reversible oxygen electrode index similar to 0.65 V, outperforms the highly active bifunctional and commercial (Pt/C and RuO2) catalysts. Density functional theory and experimental results reveal that the favorable electronic structure and atomic coordination of holey C-N skeleton enable the reversible oxygen reactions. The resulting Zn-air batteries with liquid electrolytes and the solid-state batteries with S-C(2)NA air cathodes exhibit superb energy densities (958 and 862 Wh kg(-1)), low charge-discharge polarizations, excellent reversibility, and ultralong cycling lives (750 and 460 h) than the commercial Pt/C+RuO2 catalysts, respectively. Notably, Li-O-2 batteries with S-C(2)NA demonstrated an outstanding specific capacity of similar to 648.7 mA. h g(-1) and reversible charge-discharge potentials over 200 cycles, illustrating great potential for commercial next-generation rechargeable power sources of flexible electronics.
URI
https://pubs.acs.org/doi/10.1021/acsnano.7b07473http://repository.hanyang.ac.kr/handle/20.500.11754/116998
ISSN
1936-0851; 1936-086X
DOI
10.1021/acsnano.7b07473
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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