Supercapacitor Performance of Nickel-Cobalt Sulfide Nanotubes Decorated Using Ni Co-Layered Double Hydroxide Nanosheets Grown in Situ on Ni Foam

Xin, Chen, Ang, Li, Musharavati, Farayi, Jaber, Fadi, Hui, Li, Zalnezhad, Erfan, Bae, Sungchul, Hui, Kwan San and Hui, Kwun Nam (2020) Supercapacitor Performance of Nickel-Cobalt Sulfide Nanotubes Decorated Using Ni Co-Layered Double Hydroxide Nanosheets Grown in Situ on Ni Foam. Nanomaterials, 10 (3). ISSN 2079-4991

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Abstract

In this study, to fabricate a non-binder electrode, we grew nickel-cobalt sulfide (NCS) nanotubes (NTs) on a Ni foam substrate using a hydrothermal method through a two-step approach, namely in situ growth and an anion-exchange reaction. This was followed by the electrodeposition of double-layered nickel-cobalt hydroxide (NCOH) over a nanotube-coated substrate to fabricate NCOH core-shell nanotubes. The final product is called NCS@NCOH herein. Structural and morphological analyses of the synthesized electrode materials were conducted via SEM and XRD. Different electrodeposition times were selected, including 10, 20, 40, and 80 s. The results indicate that the NCSNTs electrodeposited with NCOH nanosheets for 40 s have the highest specific capacitance (SC), cycling stability (2105 Fg-1 at a current density of 2 Ag-1), and capacitance retention (65.1% after 3,000 cycles), in comparison with those electrodeposited for 10, 20, and 80 s. Furthermore, for practical applications, a device with negative and positive electrodes made of active carbon and NCS@NCOH was fabricated, achieving a high-energy density of 23.73 Whkg-1 at a power density of 400 Wkg-1.

Item Type: Article
Uncontrolled Keywords: anion,composites,emissions,flower,mos2,nanoparticles,nanostructures,ncs@ncoh nanotubes,storage,asymmetric supercapacitor,positive electrode material
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Depositing User: LivePure Connector
Date Deposited: 02 Apr 2020 00:46
Last Modified: 24 May 2020 00:05
URI: https://ueaeprints.uea.ac.uk/id/eprint/74685
DOI: 10.3390/nano10030584

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