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Author Han, Dandan ♦ Jing, Xiaoyan ♦ Xu, Pengcheng ♦ Ding, Yuansheng ♦ Liu, Jingyuan
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ ELECTROCHEMISTRY ♦ ELECTRODES ♦ MANGANESE CARBONATES ♦ MANGANESE OXIDES ♦ MICROSPHERES ♦ MICROSTRUCTURE ♦ POROUS MATERIALS ♦ SCANNING ELECTRON MICROSCOPY ♦ SPECTRA ♦ SYNTHESIS ♦ TEMPERATURE RANGE 0273-0400 K ♦ TRANSMISSION ELECTRON MICROSCOPY ♦ VOLTAMETRY ♦ X-RAY DIFFRACTION
Abstract The hierarchical hollow microspheres of ε-MnO{sub 2} have been synthesized through a facile chemical method at room temperature followed by selective removal of manganese carbonate structures with HCl. The microstructure and morphologies of the resulting materials are investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results indicate that the product obtained by simple reaction for 3 min has a porous shell with excellent permeability and uniform pore-size distribution. Electrochemical properties were characterized by cyclic voltammetry, galvanostatic charge/discharge and impedance spectra. As a result, the hierarchical hollow ε-MnO{sub 2} showed the specific capacitance of 115 F g{sup −1} at 0.5 A g{sup −1}. These results demonstrate that the ε-MnO{sub 2} as electrode materials have potential application for high-performance supercapacitors. - Graphical abstract: The MnO{sub 2} shell with MnCO{sub 3} intermediate core is prepared at room temperature; the hollow structure with excellent permeated shell enhanced the discharge capacity and electrochemical stability.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 2014-10-15
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 218


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