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Hui, Kwun Nam, Hui, Kwan San 
ORCID: https://orcid.org/0000-0001-7089-7587, Tang, Zikang, Jadhav, V.V. and Xia, Qi Xun
(2016)
Hierarchical chestnut-like MnCo2O4 nanoneedles grown on nickel foam as binder-free electrode for high energy density asymmetric supercapacitors.
Journal of Power Sources, 330.
195–203.
ISSN 0378-7753
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Abstract
Hierarchical chestnut-like manganese cobalt oxide (MnCo2O4) nanoneedles (NNs) are successfully grown on nickel foam using a facile and cost-effective hydrothermal method. High resolution TEM image further verifies that the chestnut-like MnCo2O4 structure is assembled by numerous 1D MnCo2O4 nanoneedles, which are formed by numerous interconnected MnCo2O4 nanoparticles with grain diameter of ∼10 nm. The MnCo2O4 electrode exhibits high specific capacitance of 1535 F g−1 at 1 A g−1 and good rate capability (950 F g−1 at 10 A g−1) in a 6 M KOH electrolyte. An asymmetric supercapacitor is fabricated using MnCo2O4 NNs on Ni foam (MnCo2O4 NNs/NF) as the positive electrode and graphene/NF as the negative electrode. The device shows an operation voltage of 1.5 V and delivers a high energy density of ∼60.4 Wh kg−1 at a power density of ∼375 W kg−1. Moreover, the device exhibits an excellent cycling stability of 94.3% capacitance retention after 12000 cycles at 30 A g−1. This work demonstrates that hierarchical chestnut-like MnCo2O4 NNs could be a promising electrode for the high performance energy storage devices.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | mnco2o4,nanoneedles,graphene,hydrothermal,asymmetric supercapacitor |
| Faculty \ School: | Faculty of Science > School of Mathematics (former - to 2024) |
| UEA Research Groups: | Faculty of Science > Research Groups > Energy Materials Laboratory |
| Depositing User: | Pure Connector |
| Date Deposited: | 10 Nov 2016 10:00 |
| Last Modified: | 16 Dec 2024 01:25 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/61301 |
| DOI: | 10.1016/j.jpowsour.2016.08.116 |
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