Facile synthesis of hierarchical hollow ε-MnO{sub 2} spheres and their application in supercapacitor electrodes

Journal Article · Wed Oct 15 00:00:00 EDT 2014 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2014.06.041· OSTI ID:22443427

Han, Dandan ^[1]; Jing, Xiaoyan ^[2]; Xu, Pengcheng ^[1]; Ding, Yuansheng ^[1]; Liu, Jingyuan ^[2]

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1. College of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin province, Jilin 132022 (China)
2. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001 (China)

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.

• OSTI ID: 22443427
• Journal Information: Journal of Solid State Chemistry, Vol. 218; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 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