【2022年1月締切】CiNii ArticlesへのCiNii Researchへの統合に伴う機関認証の移行確認について

【1/6更新】2022年4月1日からのCiNii ArticlesのCiNii Researchへの統合について

Electric Double Layer Capacitance of Activated Carbon Fibers in Ionic Liquid : EMImBF<sub>4</sub>

  • SHIRAISHI Soshi
    Department of Nano-Material Systems, Graduate School of Engineering, Gunma University
  • NISHINA Naoya
    Department of Nano-Material Systems, Graduate School of Engineering, Gunma University
  • OYA Asao
    Department of Nano-Material Systems, Graduate School of Engineering, Gunma University
  • HAGIWARA Rika
    Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University

抄録

<p>The double layer capacitance properties of activated carbon fibers (ACFs) in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4) were discussed in comparison with propylene carbonate solution of 0.5 M (C2H5)4NBF4 (TEABF4/PC) as typical organic electrolyte for electric double layer capacitor (EDLC). In the case of using TEABF4/PC, the ACF electrodes showed very stable cycle-ability of the capacitance, but narrow micropores caused small capacitances by strong ion-sieving to TEA+ cation. The capacitance of the ACFs in EMImBF4 were higher than those in TEABF4/PC. However, their capacitances of the ACFs with narrow micropores dramatically decreased with the increasing cycle number, indicating that EMIm+ is adsorbed in the micropore irreversibly. The capacitance behavior of the ACFs in EMImBF4 can be explained by the stereo-chemical matching of the plane-like structure of EMIm+ cation with slit-like micropore of ACF and a strong adsorption of EMIm+ and carbon surface. Ketjen black (mesoporous carbon black) had high capacitance and good cycle-ability in EMImBF4 regardless of comparably low surface area to the ACF with narrow micropores. It suggests that wide-pore such as mesopores is effective in ion adsorption/desorption in EMImBF4.</p>

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