One-step co-precipitated beta-Ni(OH)(2) at different ratios of Ni/2-methylimidazole and its energy storage behaviour
Document Type
Article
Publication Date
1-1-2022
Abstract
In this study, a series of Ni-based Zeolitic Imidazolate Framework (ZIF) is successfully co-precipitated at room temperature with different ratios of nickel (II) nitrate hexahydrate (Ni(NO3)(2).6H(2)O) to 2-methylimidazole (mIM) at different ratios of 3:10, 1:1, and 10:3, denoted as Ni-ZIF-1, Ni-ZIF-2, and Ni-ZIF-3. The morphology, elemental, and structural investigation of Ni-ZIFs are carried out using field emission scanning electron microscopy (FESEM), energy-dispersive X-Ray spectroscopy (EDX), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD). The electrochemical performance reveals that the Ni-ZIF-3 successfully delivered the highest specific capacitance of 433 F g(-1) at current density of 0.25 A g(-1). It is important to note that when Ni-ZIF-3 is used in carbon asymmetric supercapacitor (ASC), the specific capacitance of 85 F g(-1) is achieved at a current density of 0.25 A g(-1), whilst maintaining outstanding cycling stability of 93% after 1500 cycles at reversible current density from 0.5 A g(-1) until 1.0 A g(-1). A little decay during the cycle test demonstrates that the device is capable of offering durable devices with low internal resistance. Graphic abstract
Keywords
MOFs, ZIFs, Supercapacitors, 2-Methylimidazole, Energy storage
Divisions
chemistry,PHYSICS
Funders
Ministry of Education, Malaysia [FRGS/1/2018/STG07/UM/02/08]
Publication Title
Journal of Applied Electrochemistry
Volume
52
Issue
1
Publisher
Springer
Publisher Location
VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS