Microporous MOFs Engaged in the Formation of Nitrogen‐Doped Mesoporous Carbon Nanosheets for High‐Rate Supercapacitors. Issue 11 (31st January 2018)

• Record Type: Journal Article
• Authors: Hou, Ya‐Nan; Zhao, Zongbin; Yu, Zhengfa; Zhang, Su; Li, Shaofeng; Yang, Juan; Zhang, Han; Liu, Chang; Wang, Zhiyu; Qiu, Jieshan
• Is Part Of: Chemistry. Volume 24:Issue 11(2018)
• Page Start: 2681
• Page End: 2686
• Publication Date: 2018-01-31
• Subjects: carbon -- doping -- mesoporous materials -- metal–organic frameworks -- nanosheets; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201705006
• Languages: English
• ISSNs: 0947-6539

Abstract

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 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. Abstract : Converting micropore into mesopore : Nitrogen‐doped mesoporous carbon nanosheets (NMCS) have been fabricated from a zinc‐based microporous MOF (ZIF‐8) by pyrolysis in a molten salt medium for application in high‐rate supercapacitors (see figure). The as‐prepared NMCS exhibit significantly improved specific capacitance and capacitance retention ratio compared with the micropore‐dominant nitrogen‐doped porous carbon polyhedrons obtained by direct pyrolysis of nanocrystalline ZIF‐8.