Synthesis and electrochemical evaluation of cobalt-based ZIF-67 with its potential as direct use electrode materials for supercapacitors
Document Type
Article
Publication Date
8-1-2021
Abstract
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.
Keywords
Zeolitic imidazolate frameworks, Cobalt, HmIM, Electrode materials, Supercapacitors
Divisions
PHYSICS
Funders
Malaysian Ministry of Higher Education (MoHE),Universiti Malaya (FRGS/1/2018/STG07/UM/02/8),Universiti Malaya (FG03417AFR)
Publication Title
Journal of Industrial and Engineering Chemistry
Volume
100
Publisher
Elsevier
Publisher Location
STE 800, 230 PARK AVE, NEW YORK, NY 10169 USA