Enhanced electrochemical performance of Sn-doped MnO2 and study on morphology evolution
| Autor: | Shenggen Huang, Changjing Ye, Qingqing Qin, Yucheng Wu, Jian Yan, Binbin Lan |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Morphology (linguistics) Nanostructure Mechanical Engineering Doping Metals and Alloys 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Capacitance Hydrothermal circulation 0104 chemical sciences Chemical engineering Mechanics of Materials Specific surface area Materials Chemistry 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 788:302-310 |
| ISSN: | 0925-8388 |
| Popis: | In this work, Sn-doped MnO2 samples have been synthesized by a simple hydrothermal method with the aim to enhance the electrochemical performance. With increase of Sn amount, the morphology of Sn-doped MnO2 changes from sheets composed flower-like nanostructures to rod-like nanostructures. The specific capacitance of Sn-doped MnO2 nano-flowers reaches 243.6 F g−1 at 1 A g−1. For comparison, the specific capacitance of pure MnO2 nano-flowers is only 148.6 F g−1, which clearly demonstrates the enhancement in electrochemical activity of MnO2 by Sn doping. The Sn-doped MnO2 nano-flowers also exhibit a relative good cycling performance with 95% capacitance retention after 10000 cycles test. During cycling test, the Sn-doped MnO2 nano-flowers undergo a morphology transformation from nano-flowers to rod-like nanostructures. This would reduce the specific surface area, which might be the reason causing the capacitance decay. Our findings suggest that Sn doping exhibit a controlling effect on the morphology of MnO2, which shows the tendency to form rod-like during synthesis process and cycling test. This work may provide clues for the improvement of MnO2 electrochemical performance by Sn doping. |
| Databáze: | OpenAIRE |
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