Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 786, Issue -, Pages 35-42Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2017.01.005
Keywords
Manganese dioxide; Dip & dry; Carbon nanotube; Hydrothermal; Supercapacitor
Categories
Funding
- National Natural Science Foundation of China [21503055]
- China Postdoctoral Science Foundation [2015M571390]
- Natural Science Foundation of Heilongjiang Province of China [QC2015015]
- Heilongjiang Postdoctoral Fund [LBHZ14054, LBH-TZ0609]
- Major Project of Science and Technology of Heilongjiang Province [GA14A101]
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Designing and fabricating self-supported and binder-free MnO2 nanostructure electrode to overcome their low conductivity for supercapacitor application with high comprehensive electrochemical performance, such as high capacitance, excellent stability, and good rate capability, is still a tremendous challenge. In this paper, carbon nanotubes are uniform covered on nickel foam (denote as CNT/Ni) by a simple dip & dry method to form a 3D skeleton for MnO2 nanosheets deposition (denoted as MnO2-CNT/Ni). Results show the MnO2-CNT/Ni electrode exhibits a unique 3D porous interconnected network with a high specific capacitance of 402.5 Fg(-1), at 1 Ag-1 and a favorable cycling performance that 83% capacitance retained after 5000 cycles at a current density of 2 Ag-1. Meanwhile, the MnO2-CNT/Ni//CNT/Ni asymmetric supercapacitor exhibits an excellent energy density of 25 Wh kg(-1) at a power density of 0.9 kW kg(-1) with 853% capacitance retention after 5000 cycles. Therefore, such a facile and manageable method to prepare MnO2 electrode with high supercapacitor performance is offering a promising future for practical applications. (C) 2017 Elsevier B.V. All rights reserved.
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