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论文类型：期刊论文
发表时间：2018-02-21
发表刊物：Chemistry (Weinheim an der Bergstrasse, Germany)
收录刊物：SCIE、EI、PubMed
卷号：24
期号：11
页面范围：2681-2686
ISSN号：1521-3765
关键字：carbon,doping,mesoporous materials,metal-organic frameworks,nanosheets
摘要：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.