We report a remarkable observation that is at odds with the established notion that β-MnO2 was regarded as an undesirable candidate for supercapacitor applications. The specific capacitance of β-MnO2 can reach as high as 294 F g−1, which is comparable to the best crystallographic structure, like α-MnO2. The key is to substantially decrease the size of β-MnO2 powders to ultra small regime. We demonstrate a facile, simple, and effective approach to synthesizing ultrafine (<10 nm in diameter) β-MnO2/polypyrrole nanorod composite powders for high-performance supercapacitor electrodes. Our observation may encourage a revisit of the other good or even bad candidate active materials if we can decrease their size to extremely small scales. In addition, the proposed synthetic mechanism and the developed synthetic strategy may provide design guidelines in synthesizing other energy storage materials toward ultrafine 1Dnanostructures.
Published in Journal of Materials Chemistry, Volume 21, Issue 29, 2011, pages 10965-10969.
©Journal of Materials Chemistry 2011, Royal Society of Chemistry.
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This article was first published by the Royal Society of Chemistry and can be found at http://dx.doi.org/10.1039/C1JM11491C
Zang, J & Li, X. (7 August 2011). In Situ Synthesis of Ultrafine ß-MnO2/Polypyrrole Nanorod Composites for High-Performance Supercapacitors. Journal of Materials Chemistry, 21 (29), 10965 – 10969. http://dx.doi.org/10.1039/C1JM11491C