Hierarchically Designed 3D Holey C2N Aerogels as Bifunctional Oxygen Electrodes for Flexible and Rechargeable Zn-Air Batteries
- Authors
- Shinde, Sambhaji S.; Lee, Chi Ho; Yu, Jin-Young; Kim, Dong-Hyung; Lee, Sang Uck; Lee, Jung-Ho
- Issue Date
- Jan-2018
- Publisher
- AMER CHEMICAL SOC
- Keywords
- holey C2N; bifunctional oxygen electrocatalyst; liquid and solid-state Zn-air batteries; Li-O-2 battery; density functional theory
- Citation
- ACS NANO, v.12, no.1, pp.596 - 608
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS NANO
- Volume
- 12
- Number
- 1
- Start Page
- 596
- End Page
- 608
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/181925
- DOI
- 10.1021/acsnano.7b07473
- ISSN
- 1936-0851
- 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.
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