Mesoporous MnO2 synthesized by using a tri-block copolymer for electrochemical supercapacitor studies

Nayak, Prasant Kumar and Munichandraiah, N (2011) Mesoporous MnO2 synthesized by using a tri-block copolymer for electrochemical supercapacitor studies. In: Microporous and Mesoporous Materials, 143 (1). pp. 206-214.

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Abstract

Mesoporous MnO2 is prepared from KMnO4 by using a tri-block copolymer, namely, poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (PEG-PPG-PEG) as a reducing as well as a structure-directing agent. The as synthesized MnO2 samples are poorly crystalline with mesoporosity having pore diameter between 8 and 40 nm. BET surface area as high as 273 m(2) g(-1) is obtained. By heating, the poorly crystalline MnO2 turns into a well crystalline form at 400 degrees C with nanorod morphology. However, the surface area decreases for the heated samples. Samples of MnO2 prepared by varying the ratio of KMnO4 and the copolymer, and also the heated samples are subjected to electrochemical characterization for supercapacitor studies. High specific capacitance values on mass basis are obtained for the as prepared mesoporous MnO2 samples. (C) 2011 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Publication:	Microporous and Mesoporous Materials
Publisher:	Elsevier Science B.V.
Additional Information:	Copyright of this article belongs to Elsevier Science B.V.
Keywords:	Mesoporous;Manganese oxide;Specific capacitance
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	29 Jun 2011 09:00
Last Modified:	29 Jun 2011 09:00
URI:	http://eprints.iisc.ac.in/id/eprint/38623

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