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Journal of Chemistry
Volume 2015, Article ID 768023, 5 pages
http://dx.doi.org/10.1155/2015/768023
Research Article

Synthesis and Electrochemical Characterization of Mesoporous MnO2

College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

Received 19 June 2014; Revised 5 November 2014; Accepted 6 November 2014

Academic Editor: A. K. Arof

Copyright © 2015 Jia Chang Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The pore, crystal structure, and electrochemical performance of mesoporous MnO2 prepared by silica sol template method as electrode material for supercapacitor were investigated in this work. It is found that the crystal structure of nonporous and mesoporous MnO2 is confirmed to be β-MnO2 and the crystallinity of mesoporous MnO2 decreases due to the formation of mesopore. The results of electrochemical performance show that the specific capacitances of the sample prepared by using 20 g of Mn(NO3)2 solution and 40 g of silica sol (named MMO-4) at the scan rate of 5 mV/s are the highest (163.2 F/g), in comparison with 19.3 F/g of that of the sample of blank, suggesting the important role of pore-forming using silica sol as template. As the potential scan rate is raised to 200 mV/s, the specific capacitances of the sample of blank and MMO-4 are 12.2 F/g and 21.6 F/g, respectively. The great improvement of specific capacitance is probably due to the enlarged activated surface area after template is added.