Rational design of integrated CuO@CoxNi1−x(OH)2 nanowire arrays on copper foam for high-rate and long-life supercapacitors

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Wu, Shuxing, Guo, Hengzhi, Hui, Kwan San ORCID: https://orcid.org/0000-0001-7089-7587 and Hui, Kwun Nam (2019) Rational design of integrated CuO@CoxNi1−x(OH)2 nanowire arrays on copper foam for high-rate and long-life supercapacitors. Electrochimica Acta, 295. pp. 759-768. ISSN 0013-4686

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Abstract

Rational electrode architectural design, favorable electrode composition, and versatile synthesis approach play a significant role in developing advanced electrodes for high-performance supercapacitor. In this work, we report a facile approach for fabricating 1D hierarchical CuO@CoxNi1−x(OH)2 nanowire arrays grown on 3D highly conductive copper foam. The optimized CuO@Co0.2Ni0.8(OH)2 electrode delivers an ultrahigh specific capacity of 374.7 mAh g−1 at 2 A g−1 with exceptional rate capability (301.7 mAh g−1 at 50 A g−1) and remarkable cycling stability (95.9% after 10 000 cycles at 50 A g−1). A flexible asymmetric solid-state supercapacitor (ASC) is fabricated using the optimized CuO@Co0.2Ni0.8(OH)2 as the positive electrode, activated carbon-coated nickel foam as the negative electrode, and polyvinyl alcohol/KOH gel as electrolyte. The flexible ASC operating with a potential window of 0–1.6 V delivers an energy density of 46.5 Wh kg−1 with a power density of 526.9 W kg−1. The ASC also exhibits excellent cycling stability with a capacity retention of 84.3% after 10 000 cycles at a current density of 7 A g−1.

Item Type: Article
Uncontrolled Keywords: copper oxide,nickel–cobalt hydroxide,copper foam,nanowire arrays,flexible asymmetric supercapacitor
Faculty \ School: Faculty of Science > School of Mathematics
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Depositing User: LivePure Connector
Date Deposited: 06 Nov 2018 09:30
Last Modified: 22 Oct 2022 04:15
URI: https://ueaeprints.uea.ac.uk/id/eprint/68774
DOI: 10.1016/j.electacta.2018.10.183

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