Thursday, July 10, 2014

High-voltage and high-rate symmetric supercapacitor based on MnO 2 -polypyrrole hybrid nanofilm

A manganese oxide (MnO 2 ) nanosheet film, hybridized with a conducting polymer polypyrrole (PPy), was prepared through the direct reaction of a carbon cloth with potassium permanganate (KMnO 4 ) and through the subsequent chemical polymerization; this type of prepared nanosheet has been used as an electrode for symmetric supercapacitors. The influence of the reaction time in the KMnO 4 solution on the capacitive property of the MnO 2 film was systematically investigated. Further experimentation revealed that the PPy with the high electrical conductivity had promoted the charge transfer in the MnO 2 nanofilm and had played an important role in enhancing the electrode performance (∼45.6 mF cm −2 ). An areal capacitance of 25.9 mF cm −2 and an excellent rate performance (∼50.08% of the initial capacitance when the scan rate increases 100 times from 2.5 to 250 mV s −1 ) can be achieved for an aqueous symmetr...

Chong Wang, Yang Zhan, Lingxia Wu, Yuanyuan Li and Jinping Liu

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