Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2013-05-25

Journal: JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals: Scopus、EI、SCIE

Volume: 560

Page Number: 151-155

ISSN: 0925-8388

Key Words: Energy storage materials; Nanostructured materials; Oxide materials; Chemical synthesis; Liquid-solid reactions

Abstract: Manganese dioxide nanorods were synthesized by a facile method through simply refluxing the reaction mixture of KMnO4 and MnCl2 solution in the presence of K2Cr2O7. The products were characterized by X-ray powder diffraction and scanning electron microscopy. alpha-MnO2 nanorods with diameters of 50-100 nm and lengths of 0.5-2 mu m were formed depending on the amount of K2Cr2O7 together with the reflux time. The formation mechanism of the alpha-MnO2 nanorods was discussed in detail. The electrode performance of manganese dioxide for use as capacitor was studied by cyclic voltammetry (CV) and galvanostatic charge-discharge. The alpha-MnO2 nanorods which were prepared with a mass ratio of K2Cr2O7 to KMnO4 of 1:10 exhibited good electrochemical performance, and a specific capacitance as high as 245 F g (1) was measured at a current density of 1 A g (1). (C) 2013 Elsevier B.V. All rights reserved.