Wang, Teng and Zhang, Shengli and Yan, Xingbin and Lyu, Miaoqiang and Wang, Lianzhou and Bell, John and Wang, Hongxia (2017) 2-methylimidazole-derived Ni-Co layered double hydroxide nanosheets as high rate capability and high energy density storage material in hybrid supercapacitors. ACS Applied Materials and Interfaces, 9 (18). pp. 15510-15524. ISSN 1944-8244
Abstract
A new method based on one-step solvothermal reaction is demonstrated to synthesize ultrathin Ni–Co layered double hydroxide (LDH) nanosheets, which grow directly on a flexible carbon fiber cloth (NiCo-LDH/CFC). Through using 2-methylimidazole as complex and methanol as solvent, the as-prepared NiCo-LDH/CFC shows a (003) facet preferential growth and an expanded interlayer spacing structure, resulting in a unique 3D porous nanostructure with a thickness of nanosheets of around 5–7 nm that shows high energy storage performance. By controlling the ratio of Ni/Co = 4:1 in the precursor solution, the electrode shows a specific capacitance of 2762.7 F g–1 (1243.2 C g–1) at a current density of 1 A g–1. Nevertheless, the optimal composition is obtained with Ni/Co = 1:1, which produces a specific capacitance of 2242.9 F g–1 (1009.3 C g–1) at 1 A g–1 and shows an excellent rate capability with 61% of the original capacitance being retained at a current density of 60 A g–1. The hybrid supercapacitor (HSC) based on the NiCo-LDH/CFC exhibits a maximum energy density of 59.2 Wh kg–1 and power densities of 34 kW kg–1, respectively. Long-term stability test shows that 82% of the original capacitance of the HSC remains after 5000 cycles. Importantly, the electrochemical performance of the solid-state flexible supercapacitors based on the prepared NiCo-LDH/CFC electrode showed a negligible change when the device was bent up to 180°. The performance of synthesized NiCo-LDH/CFC indicates the great potential of the material for delivering both high energy density and high power density in energy storage devices.
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| Item Type: | Article (Commonwealth Reporting Category C) |
|---|---|
| Refereed: | Yes |
| Item Status: | Live Archive |
| Additional Information: | Files associated with this item cannot be displayed due to copyright restrictions. |
| Faculty/School / Institute/Centre: | Current - Research and Innovation Division (12 Jul 2012 -) |
| Faculty/School / Institute/Centre: | Current - Research and Innovation Division (12 Jul 2012 -) |
| Date Deposited: | 18 Sep 2020 00:24 |
| Last Modified: | 24 Sep 2020 06:17 |
| Uncontrolled Keywords: | hybrid supercapacitor; NiCo-LDH nanosheets; binder-free; flexible; carbon fiber cloth; atomic thickness |
| Fields of Research (2008): | 03 Chemical Sciences > 0399 Other Chemical Sciences > 039999 Chemical Sciences not elsewhere classified |
| Fields of Research (2020): | 34 CHEMICAL SCIENCES > 3499 Other chemical sciences > 349999 Other chemical sciences not elsewhere classified |
| Identification Number or DOI: | https://doi.org/10.1021/acsami.7b02987 |
| URI: | http://eprints.usq.edu.au/id/eprint/39390 |
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