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Indexed by:期刊论文

Date of Publication:2018-02-21

Journal:Chemistry (Weinheim an der Bergstrasse, Germany)

Included Journals:SCIE、EI、PubMed

Volume:24

Issue:11

Page Number:2681-2686

ISSN No.:1521-3765

Key Words:carbon,doping,mesoporous materials,metal-organic frameworks,nanosheets

Abstract:Nitrogen-doped mesoporous carbon nanosheets (NMCS) have been fabricated from zinc-based microporous metal-organic frameworks (ZIF-8) by pyrolysis in a molten salt medium. The as-prepared NMCS exhibit significantly improved specific capacitance (NMCS-8: 232 Fg-1 at 0.5 Ag-1 ) and capacitance retention ratio (75.9% at 50 Ag-1 ) compared with the micropore-dominant nitrogen-doped porous carbon polyhedrons (NPCP-5: 178 Fg-1 at 0.5 Ag-1 , 15.9% at 20 Ag-1 ) obtained by direct pyrolysis of nanocrystalline ZIF-8. The excellent capacitive performance and high rate performance of the NMCS can be attributed to their unique combination of structure and composition, that is, the two-dimensional and hierarchically porous structure provides a short ion-transport pathway and facilitates the supply of electrolyte ions, and the nitrogen-doped polar surface improves the interface wettability when used as an electrode. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.