Supercapacitor performance of porous nickel cobaltite nanosheetsopen access
- Authors
- Chen, Xin; Xie, Rui; Li, Hui; Jaber, Fadi; Musharavati, Farayi; Zalnezhad, Erfan; Bae, Sung Chul; Hui, Kwan San; Hui, Kwun Nam
- Issue Date
- Nov-2020
- Publisher
- NATURE PORTFOLIO
- Citation
- SCIENTIFIC REPORTS, v.10, no.1, pp.1 - 13
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENTIFIC REPORTS
- Volume
- 10
- Number
- 1
- Start Page
- 1
- End Page
- 13
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/144425
- DOI
- 10.1038/s41598-020-75946-1
- ISSN
- 2045-2322
- Abstract
- In this work, nickel cobaltite (NiCo2O4) nanosheets with a porous structure were fabricated on nickel foam as a working electrode for supercapacitor applications. The nanosheets were fabricated by electrochemical deposition of nickel-cobalt hydroxide on the nickel foam substrate at ambient temperature in a three-electrode cell followed by annealing at 300 degrees C to transform the coating into a porous NiCo2O4 nanosheet. Field emission scanning electron microscopy and transmission electron microscopy revealed a three-dimensional mesoporous structure, which facilitates ion transport and electronic conduction for fast redox reactions. For one cycle, the NiCo2O4 electrodeposited nickel foam has a high specific capacitance (1734.9 F g(-1)) at a current density (CD) of 2 A g(-1). The electrode capacitance decreased by only approximately 12.7% after 3500 cycles at a CD of 30 A g(-1). Moreover, a solid-state asymmetric supercapacitor (ASC) was built utilising the NiCo2O4 nanosheets, carbon nanotubes, and a polyvinyl alcohol-potassium hydroxide gel as the anode, cathode, and solid-state electrolyte, respectively. The ASC displayed great electrochemical properties with a 42.25 W h kg(-1) energy density at a power density of 298.79 W kg(-1).
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