Redox Capacitor Properties of Indole Derivatives III―Electrochemical Characteristics of 5-Carboxy Cyclic Indole Trimers in Non-Aqueous Electrolyte

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  • MACHIDA Kenji
    Center of Future Nanomaterials Science, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
  • NAKAGAWA Yumiko
    Center of Future Nanomaterials Science, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
  • OGIHARA Nobuhiro
    Center of Future Nanomaterials Science, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
  • NAOI Katsuhiko
    Center of Future Nanomaterials Science, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology

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Other Title
  • インドール類のレドックスキャパシタ特性Ⅲ―非水電解液中での5-カルボキシサイクリックインドールトリマーの電気化学特性―
  • インドール類のレドックスキャパシタ特性(3)非水電解液中での5-カルボキシサイクリックインドールトリマーの電気化学特性
  • インドールルイ ノ レドックスキャパシタ トクセイ 3 ヒスイ デンカイエキ チュウ デ ノ 5 カルボキシサイクリックインドールトリマー ノ デンキ カガク トクセイ

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Abstract

<p>As a cathode material of hybrid supercapacitors, a 5-carboxy cyclic indole trimer (5-carboxyCIT) was characterized in a non-aqueous electrolyte, lithium tetrafluoroborate salt in the mixture of ethylene carbonate and dimethylcarbonate (LiBF4/EC+DMC). The 5-carboxyCIT electrode showed three redox couples, where charge transfer occurs with Li+ desorption/adsorption at carboxyl functional group (E0,＝0.19 V vs. Ag/Ag+), BF4− doping/undoping (E0’＝0.48V vs. Ag/Ag+), and Li+ undoping/doping (E0,＝0.96 V vs. Ag/Ag+). Specific capacity of the 5-carboxyCIT was 78 Ah kg−1 (234 Fg−1) at scan rate of 10mV s−1, which is comparable to the capacity in a 4 M H2SO4 aqueous electrolyte (86 Ah kg−1). After potential cycling of 50,000 cycles, the electrode in the LiBF4/EC+DMC electrolyte maintained 70% (55 Ah kg−1) of initial capacity</p>

Journal

  • Electrochemistry

    Electrochemistry 73 (12), 1035-1041, 2005-12-05

    The Electrochemical Society of Japan

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