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

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.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [2]
  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)
Publication Date:
OSTI Identifier:
22443427
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 218; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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