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- Title
Rapid microwave synthesis of δ-MnO microspheres and their electrochemical property.
- Authors
Zhang, Xinhao; Liu, Xiaoyang; Li, Benxian; Chu, Qingxin; Wang, Ying; Zhao, Xudong; Wang, Xiaofeng
- Abstract
The δ-MnO microspheres as well as the δ-MnO microspheres/α-MnO nanorods mixture were synthesized by reduction of KMnO under microwave irradiation. The morphology and structure of the as-prepared products were characterized by powder X-ray diffraction (PXRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), Brunauer-Emmett-Teller (BET) measurements and Raman spectra. Electrochemical performances of the samples were examined using cyclic voltammetry (CV) and galvanostatical discharge-charge test in NaSO and LiSO aqueous electrolyte, respectively. It was found that the nearly ideal rectangular shapes of the CV curves show that these samples exhibited good pseudo-capacitor properties in the voltage range from 0.0 to 1.0 V. The test of long-term cycling stability indicated that two samples all have a reasonably good stability. However, the δ-MnO microspheres possessed a lower specific surface area while a higher supercapacitance than those of the δ-MnO micropheres/ α-MnO nanorods mixture did. The presence of a few fraction α-MnO impurities reduces the specific capacitance of δ-MnO electrode. Because of the crystal structure and morphologies are two such important parameters that have to be taken into account in this work.
- Subjects
MANGANESE oxides; MICROWAVE heating; MICROSPHERES; ELECTROCHEMISTRY; NANOROD synthesis; CHEMICAL reduction
- Publication
Journal of Materials Science: Materials in Electronics, 2013, Vol 24, Issue 7, p2189
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-013-1078-5