Hydrothermal synthesis of a MnOOH/three-dimensional reduced graphene oxide composite and its electrochemical properties for supercapacitors
| Autor: | Tongchi Xia, Li-Zhen Wang, Xiaofeng Li, Qiong Wu, Shumin Sun, Peiyuan Wang, Zhenhua Wei, Shen Wang, Jin Qingxian |
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| Rok vydání: | 2015 |
| Předmět: |
Supercapacitor
Materials science Renewable Energy Sustainability and the Environment Graphene Scanning electron microscope Oxide Nanotechnology General Chemistry Electrochemistry law.invention chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Chemical engineering law Hydrothermal synthesis General Materials Science Nanoneedle |
| Zdroj: | Journal of Materials Chemistry A. 3:20944-20951 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c5ta04851f |
| Popis: | A manganese oxyhydroxide/three-dimensional reduced graphene oxide (MnOOH/3D-rGO) composite was prepared by a two-step hydrothermal procedure. Powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy analyses show that MnOOH nanoneedles grow on the porous 3D-rGO skeleton. The MnOOH/3D-rGO composite displays a high specific capacitance (327 F g−1 at 0.2 A g−1 in 1.0 M Na2SO4 electrolyte) and excellent cycling stability with 96.7% capacitance retention after 1000 cycles. The asymmetric supercapacitors made with MnOOH/3D-rGO and activated carbon exhibit excellent performances in energy storage. At a power density of 378 W kg−1, the devices can deliver a maximum energy density of 52.7 W h kg−1. The excellent electrochemical performance, including high energy density, high specific capacitance and long cycle lifetime, of the MnOOH/3D-rGO composite may be due to the synergistic effect of the 3D interpenetrating microstructure of the conductive rGO and the nanoneedle structure of MnOOH. The 3D-rGO can provide facile routes for the transfer of the ions and electrons and the nanoneedle structure is beneficial for the intercalation–deintercalation processes of Na+ ions in the MnOOH. |
| Databáze: | OpenAIRE |
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