期刊
ACS NANO
卷 12, 期 1, 页码 596-608出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b07473
关键词
holey C2N; bifunctional oxygen electrocatalyst; liquid and solid-state Zn-air batteries; Li-O-2 battery; density functional theory
类别
资金
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [2017R1A2B3006941]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and Future Planning [NRF-2015R1C1A1A02036670]
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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