A metal-free supercapacitor devices employing organic redox molecular electrodes

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  • HONMA Itaru
    Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University
  • TOMAI Takaaki
    Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University

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Other Title
  • 有機レドックス分子を用いたスーパーキャパシタ
  • ユウキ レドックス ブンシ オ モチイタ スーパーキャパシタ

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Abstract

<p>The application of organic redox active molecules to high energy density secondary batteries is promising because of their large multi-electron redox capacity, exceeding that of inorganic compounds. We have demonstrated metal-free aqueous supercapacitors by employing cathode and anode couples with different redox potential molecules, where embedding quinone molecules into the nanopores of activated carbons has stabilized their redox reaction against dissolution into liquid electrolytes. The carrier protons in the aqueous electrolytes are shuttled back and forth between the electrode couples upon charge and discharge and this energy storage mechanism can be considered as a proton rocking chair system. The capacitor showed a high energy density (〜10Wh/kg) and superior charge/discharge cycle performance (>1000) even though the device was made up of only the 5 light elements of H, C, O, S and Cl.</p>

Journal

  • Oyo Buturi

    Oyo Buturi 85 (9), 788-792, 2016-09-10

    The Japan Society of Applied Physics

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