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The rising cost and volatility of vanadium have motivated the development of redox flow batteries (RFBs) based on sustainable, widespread availability and lower cost compared to metal-based alternatives. Organic molecules have emerged as attractive alternatives due to their structural tunability, redox properties and solubility, availability, and potential cost advantages. Quinone derivatives, in particular, exhibit fast, reversible redox kinetics in acidic media and are among the most extensively studied organic redox couples. Benzoquinone disulfonic acid (BQDS) has shown promising electrochemical stability and high aqueous solubility, making it a suitable positive electrolyte for hybrid hydrogen/quinone flow battery configurations. However, the electrochemical performance of such systems is strongly dependent on the electrode microstructure, surface area, and catalytic activity. In this study, carbon cloth (CC) electrodes were modified with pristine carbon nanotubes (CNTs), aligned CNTs (A-CNTs), and home-synthesized N-doped CNTs through a facile electrophoretic deposition (EPD) process. The resulting nanostructured electrodes exhibited improved surface coverage and enhanced electroactive surface area compared to unmodified CC, as confirmed by cyclic voltammetry. These findings highlight the potential of CNT-modified CC electrodes to improve charge transfer kinetics, increase electrolyte utilization, and enhance round-trip efficiency in aqueous–organic RFBs.

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Electrophoretic Deposition of Nanomaterial Catalysts on Carbon Cloth Electrodes for Aqueous-Organic Flow Batteries

  • 会议论文

  • 发表日期：

    2026年

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  • Reza Afshar Ghotli,
  • Züleyha Kudaş,
  • Shamik Chaudhuri,
  • Süleyman Çelik,
  • Tülay Yılmaz İnan,
  • Serap Hayat Soytaş,
  • Zehra Çobandede,
  • Mustafa Kemal Bayazıt,
  • Andres Parra Puerto,
  • Ülrich Hirn,
  • Stefan Spirk,
  • Barun Kumar Chakrabarti

摘要

The rising cost and volatility of vanadium have motivated the development of redox flow batteries (RFBs) based on sustainable, widespread availability and lower cost compared to metal-based alternatives. Organic molecules have emerged as attractive alternatives due to their structural tunability, redox properties and solubility, availability, and potential cost advantages. Quinone derivatives, in particular, exhibit fast, reversible redox kinetics in acidic media and are among the most extensively studied organic redox couples. Benzoquinone disulfonic acid (BQDS) has shown promising electrochemical stability and high aqueous solubility, making it a suitable positive electrolyte for hybrid hydrogen/quinone flow battery configurations. However, the electrochemical performance of such systems is strongly dependent on the electrode microstructure, surface area, and catalytic activity. In this study, carbon cloth (CC) electrodes were modified with pristine carbon nanotubes (CNTs), aligned CNTs (A-CNTs), and home-synthesized N-doped CNTs through a facile electrophoretic deposition (EPD) process. The resulting nanostructured electrodes exhibited improved surface coverage and enhanced electroactive surface area compared to unmodified CC, as confirmed by cyclic voltammetry. These findings highlight the potential of CNT-modified CC electrodes to improve charge transfer kinetics, increase electrolyte utilization, and enhance round-trip efficiency in aqueous–organic RFBs.