期刊
MATERIALS
卷 10, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/ma10090988
关键词
manganese dioxide; core-shell structure; porous; electrochemical capacitors; long stability
类别
资金
- National Natural Science Foundation of China [51362027, 21363022, 21606050, 51661008]
An allomorph MnO2@MnO2 core-shell nanostructure was developed via a two-step aqueous reaction method. The data analysis of Scanning Electron Microscopy, Transmission Electron Microscopy, X-Ray Diffraction and N-2 adsorption-desorption isotherms experiments indicated that this unique architecture consisted of a porous layer of amorphous-MnO2 nano-sheets which were well grown onto the surface of alpha-MnO2 nano-needles. Cyclic voltammetry experiments revealed that the double-layer charging and Faradaic pseudo-capacity of the MnO2@MnO2 capacitor electrode contributed to a specific capacitance of 150.3 F.g(-1) at a current density of 0.1 A.g(-1). Long cycle life experiments on the as-prepared MnO2@MnO2 sample showed nearly a 99.3% retention after 5000 cycles at a current density of 2 A.g(-1). This retention value was found to be significantly higher than those reported for amorphous MnO2-based capacitor electrodes. It was also found that the remarkable cycleability of the MnO2@MnO2 was due to the supporting role of alpha-MnO(2)nano-needle core and the outer amorphous MnO2 layer.
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