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Anthraquinone-2,7-disulphonate (AQDS) added into neutral electrolyte of KNO3 in symmetric active carbon (AC) capacitor was assessed by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques. The Faradaic redox reactions were diffusion-controlled and the working window could be extended to 1.8V. During the charging and discharging processes, the redox...
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