3D heterostructured cobalt oxide@layered double hydroxide core-shell networks on nickel foam for high-performance hybrid supercapacitor

Zhang, Luojiang, Hui, K. N., Hui, K. S. ORCID: https://orcid.org/0000-0001-7089-7587 and Or, Siu Wing (2019) 3D heterostructured cobalt oxide@layered double hydroxide core-shell networks on nickel foam for high-performance hybrid supercapacitor. Dalton Transactions, 48 (1). pp. 150-157. ISSN 1477-9226

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High performance of an electrode relies largely on scrupulous design of nanoarchitectures and smart hybridization of bespoke active materials. Here, a 3D heterostructured core-shell architecture was fabricated as a supercapacitor electrode, in which Co 3 O 4 nanowire cores were grown on nickel foam prior to the in situ deposition of layered double hydroxide (LDH) nanosheet shells. Owing to the unique configuration and hybridization, the as-fabricated Co 3 O 4 @LDH core-shell electrode exhibited high capacities of 818.6 C g −1 at 2 A g −1 and 479.3 C g −1 at 40 A g −1 (3.2 C cm −2 at 7.8 mA cm −2 and 1.87 C cm −2 at 156 mA cm −2 ), which were much higher than those of the individual components, namely, Co 3 O 4 and LDH. A hybrid supercapacitor with Co 3 O 4 @LDH as the positive electrode and graphene nanosheets as the negative electrode yielded an energy density of 53.2 W h kg −1 and a power density of 16.4 kW kg −1 , which outperformed devices reported in the literature; the device also exhibited long-term cycling stability and retained 71% of its initial capacity even after 10 000 cycles at 6 A g −1 . The rational design of the core-shell architecture may lead to the development of new strategies for fabricating promising electrode materials for electrochemical energy storage.

Item Type: Article
Additional Information: Funding Information: This work was supported by the Research Grants Council of the HKSAR Government (15217917), the Postdoctoral Fellowships Scheme of The Hong Kong Polytechnic University (1-YW3C), the Innovation and Technology Commission of the HKSAR Government to the Hong Kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center (1-BBYW), the Science and Technology Development Fund of the Macau SAR (FDCT 098/ 2015/A3 and FDCT 191/2017/A3), and the Multi-Year Research Grants (MYRG2017-00216-FST and MYRG2018-00192-IAPME) from the Research Services and Knowledge Transfer Office at the University of Macau. Publisher Copyright: © The Royal Society of Chemistry.
Uncontrolled Keywords: inorganic chemistry ,/dk/atira/pure/subjectarea/asjc/1600/1604
Faculty \ School: Faculty of Science
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Depositing User: LivePure Connector
Date Deposited: 04 Apr 2024 09:30
Last Modified: 04 Apr 2024 09:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/94802
DOI: 10.1039/C8DT03350A

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