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Issue 45, 2013
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Performance loss of aqueous MnO2/carbon supercapacitors at elevated temperature: cycling vs. storage

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Abstract

Birnessite MnO2 nanotubes of high specific surface area have been used as one electrode material in supercapacitors with a commercial-carbon-based second electrode ((NH4)2SO4(aq.) electrolyte). Assembled cells have been subjected to full electrochemical testing at temperatures ≤80 °C. At elevated temperatures, specific capacitance as high as 700 F g−1 has been observed. The increase in specific capacitance with temperature has been found to be at a cost to cycling performance. Furthermore, the time spent at elevated temperatures “at rest” has been shown to have a major effect on device lifetime. It has been found that at 80 °C, without cycling, such devices lose all significant capacitance after 21 days. The findings herein are believed to have major implications for transport, storage lifetime and ultimate utilization of such systems.

Graphical abstract: Performance loss of aqueous MnO2/carbon supercapacitors at elevated temperature: cycling vs. storage

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Publication details

The article was received on 14 Aug 2013, accepted on 08 Oct 2013 and first published on 09 Oct 2013


Article type: Paper
DOI: 10.1039/C3TA13213G
Citation: J. Mater. Chem. A, 2013,1, 14140-14146

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    Performance loss of aqueous MnO2/carbon supercapacitors at elevated temperature: cycling vs. storage

    A. J. Roberts and R. C. T. Slade, J. Mater. Chem. A, 2013, 1, 14140
    DOI: 10.1039/C3TA13213G

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