Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2018-02-21

Journal: Chemistry (Weinheim an der Bergstrasse, Germany)

Included Journals: PubMed、EI、SCIE

Volume: 24

Issue: 11

Page Number: 2681-2686

ISSN: 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.