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without knowing details about the electrochemical systems (i.e. electrochemical measurements are done into the negative window of the electrolyte) it is hard to evaluate the anodic and cathodic peaks on the CV plots. Both processes appeared quite separated in volts, so in principle it is hard to understand that such systems could work as an electrode in a symmetric electrochemical cell without showing a nearly rectangular CV curve, where at each voltage the electrode might evidence the same differential capacitance. Moreover, with such separation in volts, the kinetics of charge transfer might be not enough to allow cycling at those current at which a supercapacitor works (at least 40 A/g without losing more than 3-5% of the initial capacitance)
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