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      • Activated porous carbon derived from black tea waste for supercapacitor electrode

        Hojong Eom,Joo Young Kim,Sunyoung Bae,Inho Nam 한국분석과학회 2021 학술대회논문집 Vol.2021 No.11

        As the amount of used black tea waste is increasing, it demands economically and environmentally efficient recycling method. Herein, we reacted black tea waste under various conditions to use as an active material for supercapacitors. Among value-added products generated by recycling method, supercapacitors have received a great attention. In our study, black tea waste was converted to the activated hydrochar after hydrothermal carbonization process followed by activation process with KOH. It provided a large surface area and porous structure that is suitable for an active material for supercapacitor. In order for the black tea waste to have high surface area and specific capacitance, the reaction temperature and the ratio of KOH were optimized. As a result, activated hydrochar of black tea waste has a large surface area of 1,062 m² and specific capacitance up to 200 F·g<SUP>-1</SUP> at 1 mV·s<SUP>-1</SUP>. In addition, it remained 98.8% charge-discharge capacitance after 2000 cycles at the current density of 5 A·g<SUP>−1</SUP>. In conclusion, black tea waste might be abundant source of porous carbon for supercapacitor after hydrothermal carbonization followed by KOH activation.

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