Double Layer Properties of Spent Coffee Grounds-derived Carbon Activated with Potassium Hydroxide (KOH)

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  • KIKUCHI Keisuke
    Industrial Research Institute of Shizuoka Prefecture
  • YASUE Tomohiro
    Department of Materials Science and Chemical Engineering, Shizuoka University
  • YAMASHITA Rie
    Industrial Research Institute of Shizuoka Prefecture
  • SAKURAGAWA Satoshi
    Industrial Research Institute of Shizuoka Prefecture
  • SUDOH Masao
    Department of Materials Science and Chemical Engineering, Shizuoka University
  • ITAGAKI Masayuki
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science

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Large amounts of spent coffee grounds (SCGs) are generated all over the world. Since SCGs contain a lot of carbon and inherently has a porous structure, SCGs are considered to be a valuable industrial resource by carbonization. According to our previous research, it was apparent that the specific surface area of SCGs-derived carbon was greatly improved by potassium hydroxide (KOH) activation. In this research, we prepared an electric double layer capacitor (EDLC) using SCGs-derived carbon activated with KOH, and compared them to phenol resin-derived activated carbon (MSP-20, Kansai Coke and Chemicals Co., Ltd.), which is commonly used as a reference material in EDLC research. Electrodes were prepared by mixing 80 wt% activated carbon, 10 wt% carbon black and 10 wt% polytetrafluoroethylene (PTFE) and the electrolyte used was 1 M triethylmethylammonium-tetrafluoroborate (TEMA-BF4)/propylene carbonate (PC). The capacitive performance was evaluated by a constant current charge-discharge cycle measured with various electrical current loads from 5 to 150 mA/cm2. Although the capacitance of SCGs-derived carbon activated with KOH was inferior to that of MSP-20 at low current load density, it had high capacitance in high rate charge-discharge cycles. This suggests that the EDLC consisting of SCGs-derived activated carbon electrodes is superior to MSP-20 in capacitance retention rate when used at a high electric current density.

収録刊行物

  • Electrochemistry

    Electrochemistry 81 (10), 828-832, 2013

    公益社団法人　電気化学会

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