Solvothermal synthesis of nanostructured nickel-based metal-organic frameworks (Ni-MOFs) with enhanced electrochemical performance for symmetric supercapacitors
Document Type
Article
Publication Date
8-1-2023
Abstract
Metal-organic frameworks (MOFs) have been studied in a wide range of applications due to their high porosity, large specific surface areas and tunable structures. Nonetheless, the synthesis environment such as compositional and processing parameters has a crucial role to play in the structural and morphological properties. In this study, the impact of temperature and time on the morphology and electrochemical performance of nickel-based MOFs (Ni-MOFs) were systematically investigated. In particular, Ni-MOF nanomaterials were synthesized at different solvothermal temperature ranges: (i) 100, 120 and 140 degrees C (below the boiling point of DMF, similar to 153 degrees C); (ii) 160 and 180 degrees C (above the boiling point of DMF but below the boiling point of ethylene glycol (EG), similar to 197.3 degrees C) and (iii) 200 degrees C (above the boiling point of EG). Meanwhile, the solvothermal reaction time ranged from 8 to 32 h. It was found that the average size of Ni-MOF nanosheets tended to decrease with increasing solvothermal temperature. However, the crystallinity of Ni-MOF indicated a direct correlation with synthesis temperature. The solvothermal time only had a slight influence on the resultant morphologies. Noteworthily, an excellent energy density of 22.44 Wh kg(-1) and a superior cyclic durability of 118% over 10,000 cycles were achieved by the nanostructures synthesized at 160 degrees C, which has been used in the symmetrical supercapacitor electrodes in an environmental-friendly aqueous electrolyte. The results showed that such Ni-MOF nanomaterials can be used as a potential symmetrical electrode in the application of SCs. GRAPHICS] .
Divisions
PHYSICS
Funders
Ministry of Education, Malaysia (PRGS/1/2016/STG06/UM/02/1) ; (FRGS/1/2019/STG02/UNIM/01/1)
Publication Title
Journal of Materials Science
Volume
58
Issue
29
Publisher
Kluwer (now part of Springer)
Publisher Location
ONE NEW YORK PLAZA, SUITE 4600, NEW YORK, NY, UNITED STATES