期刊
JOURNAL OF APPLIED ELECTROCHEMISTRY
卷 52, 期 1, 页码 159-172出版社
SPRINGER
DOI: 10.1007/s10800-021-01627-0
关键词
MOFs; ZIFs; Supercapacitors; 2-Methylimidazole; Energy storage
资金
- Ministry of Higher Education Malaysia [FRGS/1/2018/STG07/UM/02/08]
- University Malaya [FG034-17AFR]
A series of Ni-based Zeolitic Imidazolate Framework (ZIF) materials were successfully synthesized. Among them, Ni-ZIF-3 exhibited excellent electrochemical performance with high specific capacitance and cycling stability, demonstrating outstanding performance.
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
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