Microporous MOFs Engaged in the Formation of Nitrogen‐Doped Mesoporous Carbon Nanosheets for High‐Rate Supercapacitors

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 retenti...

Full description

Saved in:
Bibliographic Details
Published in:Chemistry : a European journal 2018-02, Vol.24 (11), p.2681-2686
Main Authors: Hou, Ya‐Nan, Zhao, Zongbin, Yu, Zhengfa, Zhang, Su, Li, Shaofeng, Yang, Juan, Zhang, Han, Liu, Chang, Wang, Zhiyu, Qiu, Jieshan
Format: Article
Language:English
Subjects:
Capacitance
Carbon
Chemistry
doping
EGR-1 protein
mesoporous materials
metal–organic frameworks
Molten salts
Nanosheets
Nitrogen
Pyrolysis
Salts
Supercapacitors
Wettability
Zinc
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. 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.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201705006