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A high-energy-density hybrid electrochemical capacitor (HEC) has been developed. The advanced HEC has graphitizable carbon activated with KOH (KOH-activated soft carbon) for the positive electrode instead of activated carbon, which is used in a conventional HEC or an electric double-layer capacitor (EDLC). The KOH-activated soft carbon had low electrostatic capacitance due to its small specific surface...
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