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Activated carbon–MnO 2 hybrid electrochemical supercapacitor cells have been assembled and characterized in K 2 SO 4 aqueous media. A laboratory cell achieved 195,000 cycles with stable performance. The maximal cell voltage was 2V associated with 21±2Fg −1 of total composite electrode materials (including activated carbon and MnO 2 , binder and conductive additive)...
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