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Microporous MOFs Engaged in the Formation of Nitrogen‐Doped Mesoporous Carbon Nanosheets for High‐Rate Supercapacitors
Author(s) -
Hou YaNan,
Zhao Zongbin,
Yu Zhengfa,
Zhang Su,
Li Shaofeng,
Yang Juan,
Zhang Han,
Liu Chang,
Wang Zhiyu,
Qiu Jieshan
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201705006
Subject(s) - microporous material , supercapacitor , materials science , pyrolysis , chemical engineering , electrolyte , carbon fibers , nanocrystalline material , mesoporous material , capacitance , nitrogen , specific surface area , metal organic framework , inorganic chemistry , nanotechnology , electrode , chemistry , composite material , adsorption , organic chemistry , catalysis , composite number , engineering
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 F g −1 at 0.5 A g −1 ) and capacitance retention ratio (75.9 % at 50 A g −1 ) compared with the micropore‐dominant nitrogen‐doped porous carbon polyhedrons (NPCP‐5: 178 F g −1 at 0.5 A g −1 , 15.9 % at 20 A g −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.