期刊
NANO ENERGY
卷 13, 期 -, 页码 702-708出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2015.03.026
关键词
Manganese oxide; Porous tetrahedron; Urchin-shaped; Octahedron; Supercapacitor
类别
资金
- Institute of Bioengineering and Nanotechnology (Biomedical Research Council, Agency for Science, Technology and Research, Singapore)
Controlling the morphology of nanostructured manganese oxide materials can be an effective way to improve capacitance for supercapacitor applications. Herein we demonstrated for the first time the synthesis of MnO/Mn3O4, nanocomposite tetrahedrons with a porous structure, and a new method to synthesize porous urchin-shaped MnO/Mn3O4 nanocomposite. Compared with the non-porous MnO nanocrystalline octahedrons and the mixture of non-porous MnO and Mn3O4, the porous MnO/Mn3O4 nanocomposite 'urchins' exhibited superior capacitance in supercapacitor application, while the porous MnO/Mn3O4 nanocomposite tetrahedrons displayed superior stability. The excellent capacitance and stability of these nanocomposites could be explained in terms of the much higher surface area associated with their porous structure. These porous nanostructures offered a good model to investigate the effects of morphology and surface area on the capacitance of nanocomposites. (C) 2015 Elsevier Ltd. All rights reserved.
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