期刊
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
卷 100, 期 -, 页码 248-259出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2021.05.018
关键词
Zeolitic imidazolate frameworks; Cobalt; HmIM; Electrode materials; Supercapacitors
资金
- Malaysian Ministry of Higher Education (MoHE)
- University of Malaya [FRGS/1/2018/STG07/UM/02/8, FG03417AFR]
The study successfully prepared Zeolitic Imidazolate Frameworks containing imidazolate-based linkers in different molar ratios and found that Co-ZIF-R3 exhibited the highest specific capacity in 1M KOH. An asymmetric supercapacitor utilising Co-ZIF-R3 showed good performance within a large working potential and maintained a high capacity after 2500 cycles.
Zeolitic Imidazolate Frameworks containing imidazolate-based linkers were successfully prepared into three different molar ratios 3:10, 1:1, and 10:3 mmol. The effect of 2-methylimidazole (HmIM)/Cobalt (II) nitrate hexahydrate (Co(NO3)(2 center dot)6H(2)O) molar ratio on the physicochemical characteristics of Co-based ZIF-67 showed that Co-ZIF-R3 has achieved the highest specific capacity of 86 C g(-1) at 0.25 A g(-1) in 1 M KOH. An asymmetric supercapacitor (ASC) utilising Co-ZIF-R3 as fabricated cell exhibited 32 C g(-1) at current density of 0.25 A g(-1) within a large working potential of 1.70 V. Furthermore, 87% of its capacity was kept after 2500 cycles at the reversible current density of 0.50 A g(-1) until 1.0 A g(-1) revealed its high potential as electrode material for supercapacitor. This work not only amplified the information of direct use of MOF as cathode material in supercapacitors, but also the relation of the role of Co/HmIM molar ratio on the electrode materials with good electrochemical performance. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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