Trimanganese tetraoxide nanoframeworks: Morphology–controlled synthesis and application in asymmetric supercapacitors
| Autor: | Wenxian Wei, Quanfa Zhou, Liangbiao Wang, Zhongchun Li, Aijun Gu, Ying Wang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Formamide Materials science Morphology (linguistics) Mechanical Engineering Metals and Alloys 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Hydrothermal circulation 0104 chemical sciences chemistry.chemical_compound chemistry Surface-area-to-volume ratio Chemical engineering Mechanics of Materials Electrode Materials Chemistry Energy density 0210 nano-technology Mesoporous material |
| Zdroj: | Journal of Alloys and Compounds. 793:446-453 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.04.155 |
| Popis: | Trimanganese tetraoxide (Mn3O4) nanoframeworks were successfully prepared using a novel and facile hydrothermal route based on the redox–reaction between KMnO4 and formamide. The volume ratio between formamide and water has a crucial effect on the sample's morphology. When applied as the electrode material for supercapacitors, Mn3O4 nanoframeworks delivered a high specific capacity of 568 F g−1 at 0.5 A g−1 and excellent capacity retention of 98.3% after 5000 continuous cycles at 5 A g−1. The excellent performance was ascribed to its unique hollow and mesoporous features. Furthermore, Mn3O4//Bi2O3 asymmetric supercapacitor (ASC) was assembled using Mn3O4 nanoframeworks as a positive electrode and Bi2O3 nanoflowers as a negative electrode, respectively. The device delivered a maximum energy density of 16.4 W h kg−1 at 187.5 W kg−1. A Mn3O4//Bi2O3 ASC device can drive a mini–fan, indicating that Mn3O4 nanoframework is a potential positive electrode material for ASCs. |
| Databáze: | OpenAIRE |
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