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Microporosity-controlled synthesis of heteroatom codoped carbon nanocages by wrap-bake-sublime approach for flexible all-solid-state-supercapacitors

Cited 28 time in Web of Science Cited 26 time in Scopus
Authors
Kale, Vinayak S.; Hwang, Minsik; Chang, Hogeun; Kang, Jeongmin; Chae, Sue In; Jeon, Youngmoo; Yang, Jiwoong; Kim, Jonghoon; Ko, Yoon-Joo; Piao, Yuanzhe; Hyeon, Taeghwan
Issue Date
2018-09
Citation
Advanced Functional Materials, Vol.28 No.37, p. 1803786
Keywords
carbon nanomaterialscontrolled microporosityflexible all-solid-state-supercapacitorsheteroatom codopingmetal-organic frameworks
Abstract
Heteroatom-doped carbon nanomaterials with high surface area and tunable microporosity are important but they generally require difficult and multistep syntheses. Herein, a simple and straightforward strategy is introduced that involves a wrap-bake-sublime approach to synthesize microporosity controlled and heteroatom codoped carbon nanocages. A zinc-containing zeolitic imidazolate framework (ZIF-8) core is wrapped in a cross-linked oligomer containing nitrogen and phosphorus, oligo(cyclotriphosphazene-co-hexahydroxytriphenylene) (OCHT). As-synthesized core-shell ZIF-8-OCHT nanoparticles are baked at high temperatures to sublimate zinc through OCHT shell, resulting in a porous structure. Meanwhile, hollow cavities are introduced into N,P codoped carbon nanocages (NPCNs) via the sacrificial nature of ZIF-8 template. The microporosity is finely tuned by controlling thickness of the OCHT shell during synthesis of the core-shell nanoparticles, since the sublimation tendency of zinc component at high temperatures depends on the thickness of OCHT shell. A systematic correlation between the electrochemical performance of NPCNs and their microporosity is confirmed. Furthermore, the electrochemical performance of the NPCNs is related to the degree of heteroatom codoping. The approach is successfully scaled-up without compromising their electrochemical performance. Finally, a symmetric and flexible all-solid-state-supercapacitor with high energy and power density, and a long-term cycleability is demonstrated (75% capacitance retention after 20 000 cycles).
ISSN
1616-301X
URI
http://hdl.handle.net/10371/165868
DOI
https://doi.org/10.1002/adfm.201803786
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Chemical Convergence for Energy and Environment (에너지환경 화학융합기술전공)Journal Papers (저널논문_에너지환경 화학융합기술전공)
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