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<p>This study explores the synergistic potential of polyaniline (PANI) with KOH-treated carbon (KTC) derived from sugarcane bagasse, an agricultural waste used as positive electrode materials in vanadium redox flow batteries (VRFBs). We synthesized various proportions of KTC with PANI through an in situ oxidative polymerization approach. The prepared samples were thoroughly characterized to study their structural, morphological, and thermal properties, and their electrochemical performance was evaluated. The spectroscopy results confirmed PANI’s successful polymerization and integration with the KTC, while morphological results revealed a PANI network wrapped around the carbon honeycomb substrate. The electrochemical tests on the modified graphite felt (GF) demonstrated significantly enhanced redox kinetics and improved reversibility. In the charge–discharge study, the best sample (PKTC20/GF at 3&#xa0;mg/cm<sup>2</sup>) electrode exhibited a higher columbic efficiency of 96.7% at 50 mA/cm<sup>2</sup> current density due to an adequate availability of active sites, highlighting the robustness of the composite material. This work uniquely combines conducting polymer with biomass-derived carbon, exploiting their synergistic properties and offers a cost-effective, sustainable solution for enhanced VRFB performance. The findings highlight the potential use of this composite material in large-scale sustainable energy storage technologies.</p>

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Polyaniline/sugarcane bagasse carbon nanocomposite preparation, characterizations, electrochemical studies, and application in vanadium redox flow battery

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • U. Reka,
  • Mini Vellakkat,
  • Sonima Mohan,
  • H. B. Muralidhara

摘要

This study explores the synergistic potential of polyaniline (PANI) with KOH-treated carbon (KTC) derived from sugarcane bagasse, an agricultural waste used as positive electrode materials in vanadium redox flow batteries (VRFBs). We synthesized various proportions of KTC with PANI through an in situ oxidative polymerization approach. The prepared samples were thoroughly characterized to study their structural, morphological, and thermal properties, and their electrochemical performance was evaluated. The spectroscopy results confirmed PANI’s successful polymerization and integration with the KTC, while morphological results revealed a PANI network wrapped around the carbon honeycomb substrate. The electrochemical tests on the modified graphite felt (GF) demonstrated significantly enhanced redox kinetics and improved reversibility. In the charge–discharge study, the best sample (PKTC20/GF at 3 mg/cm2) electrode exhibited a higher columbic efficiency of 96.7% at 50 mA/cm2 current density due to an adequate availability of active sites, highlighting the robustness of the composite material. This work uniquely combines conducting polymer with biomass-derived carbon, exploiting their synergistic properties and offers a cost-effective, sustainable solution for enhanced VRFB performance. The findings highlight the potential use of this composite material in large-scale sustainable energy storage technologies.