Electrophoretic deposition of MnO2-coated carbon nanotubes on a graphite sheet as a flexible electrode for supercapacitors |
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| Authors: | Jinhui Zhang Yanhui Wang Jianbing Zang Guoxiang Xin Yungang Yuan Xuanhui Qu |
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| Affiliation: | 1. State Key Laboratory of Metastable Materials Science & Technology, College of Materials Science & Engineering, Yanshan University, Qinhuangdao 066004, PR China;2. State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China |
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| Abstract: | A flexible electrode was prepared by microwave heating deposition of manganese oxide (MnO2) on carbon nanotubes (CNTs) followed by electrophoretic deposition of the MnO2-coated CNTs on a flexible graphite sheet (FGS). The prepared MnO2-coated CNTs were characterized by scanning and transmission electron microscopy, and X-ray diffraction. A uniformly thin nano-scale MnO2 coating was formed on the surface of the CNTs. The MnO2-coated CNTs–FGS electrode showed highly capacitive behaviour in the 0.5 M Na2SO4 aqueous solution, with a specific capacitance of 442.9 F/g based on MnO2 at 2 mV/s. It exhibited an excellent cycling stability with no more than 1.1% capacitance loss after 1000 cycles at 50 mV/s. |
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