Supercapacitor performance of porous nickel cobaltite nanosheets

Chen, Xin, Xie, Rui, Li, Hui, Jaber, F., Musharavati, F., Zalnezhad, E., Bae, S., Hui, K. S. ORCID: https://orcid.org/0000-0001-7089-7587 and Hui, K. N. (2020) Supercapacitor performance of porous nickel cobaltite nanosheets. Scientific Reports, 10 (1). ISSN 2045-2322

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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 °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.

Item Type: Article
Uncontrolled Keywords: general ,/dk/atira/pure/subjectarea/asjc/1000
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Depositing User: LivePure Connector
Date Deposited: 14 Nov 2020 01:16
Last Modified: 22 Oct 2022 07:28
URI: https://ueaeprints.uea.ac.uk/id/eprint/77697
DOI: 10.1038/s41598-020-75946-1

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