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Mesoporous MnO2 synthesized by hydrothermal route for electrochemical supercapacitor studies

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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 °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 °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 °C.

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Authors and Affiliations

  1. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India

    Prasant Kumar Nayak & N. Munichandraiah

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  1. Prasant Kumar Nayak
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  2. N. Munichandraiah
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Correspondence to N. Munichandraiah.

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Nayak, P.K., Munichandraiah, N. Mesoporous MnO2 synthesized by hydrothermal route for electrochemical supercapacitor studies. J Solid State Electrochem 16, 2739–2749 (2012). https://doi.org/10.1007/s10008-012-1693-8

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  • DOI: https://doi.org/10.1007/s10008-012-1693-8

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