Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 2, Pages 847-850Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.08.001
Keywords
Ternary nanocomposite; Manganese oxides; Cycle stability; Supercapacitor
Funding
- National Science Council of ROC, Taiwan [NSC 98-3114-E-007-011]
- NTHU
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In this communication, a porous hierarchical nanostructure consisting of amorphous MnO2 (a-MnO2), Mn3O4 nanocrystals, and single-crystalline MnOOH nanowires is designed for the supercapacitor application, which is prepared by a simple two-step electrochemical deposition process. Because of the gradual co-transformation of Mn3O4 nanocrystals and a-MnO2 nanorods into an amorphous manganese oxide, the cycle stability of a-MnO2 is obviously enhanced by adding Mn3O4. This unique ternary oxide nanocomposite with 100-cycle CV activation exhibits excellent capacitive performances, i.e., excellent reversibility, high specific capacitances (470 Fg(-1) in CaCl2), high power property, and outstanding cycle stability. The highly porous microstructures of this composite before and after the 10,000-cycle CV test are examined by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). (C) 2010 Elsevier B.V. All rights reserved.
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