Grotthuss vs. vehicle mechanism: Insights into ion conduction in different pore structures

DOI Web Site 参考文献60件
  • Itoi Hiroyuki
    Department of Applied Chemistry, Faculty of Engineering, Aichi Institute of Technology
  • Nakamura Toshihiro
    Department of Applied Chemistry, Faculty of Engineering, Aichi Institute of Technology
  • Tazawa Shuka
    Department of Applied Chemistry, Faculty of Engineering, Aichi Institute of Technology
  • Nagai Yuto
    Department of Applied Chemistry, Faculty of Engineering, Aichi Institute of Technology
  • Suzuki Hayato
    Department of Applied Chemistry, Faculty of Engineering, Aichi Institute of Technology
  • Ito Ryoma
    Department of Applied Chemistry, Faculty of Engineering, Aichi Institute of Technology
  • Saeki Ginga
    Department of Applied Chemistry, Faculty of Engineering, Aichi Institute of Technology
  • Takagi Sho
    Department of Applied Chemistry, Faculty of Engineering, Aichi Institute of Technology
  • Iwata Hiroyuki
    Department of Electrical and Electronics Engineering, Aichi Institute of Technology
  • Ohzawa Yoshimi
    Department of Applied Chemistry, Faculty of Engineering, Aichi Institute of Technology

書誌事項

公開日
2025-03-01
DOI
  • 10.7209/carbon.040107
公開者
炭素材料学会

説明

<p>In this study, we investigated the ion conduction of protons and sulfate ions within various pore structures using an aqueous H2SO4 electrolyte. Proton conduction in aqueous electrolytes follows the Grotthuss mechanism, whereas sulfate ion conduction proceeds via the vehicle mechanism. These conduction mechanisms play a crucial role in the performance of electric double-layer capacitors, fuel cells, and related energy storage devices. Two redox-active materials, benzoquinone and 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) derivatives, undergo reversible redox reactions with protons and sulfate ions acting as counterions, respectively. These materials were hybridized into the pores of three porous carbons with varying pore structures and sizes. The two porous carbons are activated carbons, one containing only micropores and the other containing both micropores and mesopores. Additionally, a microporous carbon with three-dimensionally ordered and interconnected 1.2-nm micropores was used. The hybridized benzoquinone and TEMPO derivatives underwent reversible redox reactions within the pores, functioning as electrode materials in electrochemical capacitors. The reversible redox reactions involve the counterion diffusion of protons and sulfate ions within the pores of the porous carbons. The rate of these reversible redox reactions depended on the ion conduction within the pores. Ion conduction was assessed by examining the charge/discharge performance of the hybrids.</p>

収録刊行物

  • Carbon Reports

    Carbon Reports 4 (1), 95-108, 2025-03-01

    炭素材料学会

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