이상욱
2019-12-04T01:27:26Z
2019-12-04T01:27:26Z
2018-01
ACS NANO, v. 12, no. 1, page. 596-608
1936-0851
1936-086X
https://pubs.acs.org/doi/10.1021/acsnano.7b07473
https://repository.hanyang.ac.kr/handle/20.500.11754/116998
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.
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (no. 2017R1A2B3006941). S.U.L. thanks the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, and Future Planning (NRF-2015R1C1A1A02036670).
en_US
AMER CHEMICAL SOC
holey C2N
bifunctional oxygen electrocatalyst
liquid and solid-state Zn-air batteries
Li-O-2 battery
density functional theory
Hierarchically Designed 3D Holey C2N Aerogels as Bifunctional Oxygen Electrodes for Flexible and Rechargeable Zn-Air Batteries
Article
1
12
10.1021/acsnano.7b07473
596-608
ACS NANO
Shinde, Sambhaji S.
Lee, Chi Ho
Yu, Jin-Young
Kim, Dong-Hyung
Lee, Sang Uck
Lee, Jung-Ho
2018000602
S
GRADUATE SCHOOL[S]
DEPARTMENT OF BIONANOTECHNOLOGY
sulee
J-9027-2014
http://orcid.org/0000-0001-9596-2349