Mesoporous MnO2 synthesized by hydrothermal route for electrochemical supercapacitor studies

Nayak, Prasant Kumar and Munichandraiah, N (2012) Mesoporous MnO2 synthesized by hydrothermal route for electrochemical supercapacitor studies. In: JOURNAL OF SOLID STATE ELECTROCHEMISTRY, 16 (8). pp. 2739-2749.

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Abstract

Poorly crystalline mesoporous MnO2, which is suitable for supercapacitor studies, is synthesized from neutral KMnO4 aqueous solution by hydrothermal route. But it requires a high temperature (180 A degrees C) and also a long reaction time (24 h). Addition of a tri-block copolymer, namely, poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (P123), which is generally used as a soft template for the synthesis of nano-structured porous materials, reduces the hydrothermal temperature to 140 A degrees C and also reaction time to 2 h. When the reaction time is increased, the product morphology changes from nanoparticles to nanorods with a concomitant decrease in BET surface area. Also, the product tends to attain crystallinity. The electrochemical capacitance properties of MnO2 synthesized under varied hydrothermal conditions are studied in 0.1 M Na2SO4 electrolyte. A specific capacitance of 193 F g(-1) is obtained for the mesoporous MnO2 sample consisting of nanoparticle and nanorod mixed morphology synthesized in 6 h using P123 at 140 A degrees C.

Item Type:	Journal Article
Publication:	JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Publisher:	SPRINGER
Additional Information:	Copy right for this article belongs to Springer-Verlag
Keywords:	Mesoporous;Manganese dioxide;Nanoparticles;Nanorods;Surface area;Specific capacitance
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	21 Aug 2012 04:04
Last Modified:	21 Aug 2012 04:04
URI:	http://eprints.iisc.ac.in/id/eprint/44958

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