Journal
CHEMICAL ENGINEERING JOURNAL
Volume 354, Issue -, Pages 254-260Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.08.008
Keywords
Asymmetric supercapacitor; Ni2P nanoneedles; NiCo2O4 nanosheets; Energy density; Electrodes
Categories
Funding
- National Natural Science Foundation of China [51602131]
- Natural Science Foundation of Jiangsu Province [BK20160526]
- Jiangsu Province Postdoctoral Science Foundation [1601059C]
- Natural Science Foundation of Henan Province of China [162300410201]
- Henan Provincial Department of Science and Technology Research Project [162102210303]
- Key scientific research projects of Henan Province [16A140014, 16A140016]
- China Postdoctoral Science special Foundation [2018T110449]
- Youth Backbone Teacher Training Engineering of Young Talent Cultivation Program
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Herein, a novel three-dimensional hierarchical NiCo2O4/Ni2P structure is successfully fabricated through a facile] hydrothermal and subsequent electrodeposition process. One-dimensional Ni2P nanoneedles decorate on two-dimensional NiCo2O4 nanosheets can effectively enhance the electrical conductivity and surface area of NiCo2O4 to promote fast Faradaic reaction. The optimized NiCo2O4/Ni2P-30 electrode exhibits a high specific capacity of 2900 F g(-1) at 0.008 A cm(-2). Moreover, an asymmetric supercapacitor (ASC) is fabricated by using the NiCo2O4/Ni2P-30 as positive electrode and activated carbon as the negative electrode, the device achieves an excellent electrochemical property with the energy density of 40.7Wh kg(-1) at 800Wkg(-1). Besides, the as-assembled device also exhibits an excellent cycling performance of similar to 92.0% of initial capacitance after 5000 cycles indicating its outstanding conductivity and structural stability. All of the results demonstrate that the hierarchical NiCo2O4/Ni2P composites are electrodes in energy storage application.
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