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<p>To enhance the efficiency of supercapacitors (SCs) in energy storage systems, exploring innovative approaches is essential for optimizing the performance of both electrodes and electrolytes. In this study, we report the development of a hybrid supercapacitor incorporating a tris(4-(5-methylthiazole[5,4-d]thiazol-2-yl)phenyl)amine COF (TMT-PA-COF) electrode and a KI redox electrolyte. The KI redox additive effectively modulates the electric double layer at the electrode–electrolyte interface, facilitating enhanced faradic behavior and improving overall supercapacitor performance. The TMT-PA-COF electrode and KI redox electrolyte exhibit a remarkable capacitance of 521 F g<sup>−1</sup> at a current density of 1 A g<sup>−1</sup> in a three-electrode configuration. The resulting asymmetric supercapacitor (TMT-PA-COF/AC//ASCs) device achieves a high operating voltage window of 1.2&#xa0;V, delivering a significant energy density of 90.72 Wh kg<sup>−1</sup> and demonstrating excellent cycling stability with 95.7% retention after 11,200 cycles. The combination of the COF electrode and KI redox electrolyte offers a promising strategy for advancing the performance and efficiency of energy storage devices.</p>

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Modulation of the electric double layer interface via electroactive edge-site-enriched nitrilotribenzaldehyde COF electrode and potassium iodide redox electrolyte for enhanced hybrid supercapacitor performance

  • 期刊论文

  • 发表日期：

    2025年4月21日

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  • Eswaramoorthi Thirugnanasambandam,
  • Dineshkumar Raja,
  • Ganesan Shanmugam,
  • Berlina Maria Mahimai

摘要

To enhance the efficiency of supercapacitors (SCs) in energy storage systems, exploring innovative approaches is essential for optimizing the performance of both electrodes and electrolytes. In this study, we report the development of a hybrid supercapacitor incorporating a tris(4-(5-methylthiazole[5,4-d]thiazol-2-yl)phenyl)amine COF (TMT-PA-COF) electrode and a KI redox electrolyte. The KI redox additive effectively modulates the electric double layer at the electrode–electrolyte interface, facilitating enhanced faradic behavior and improving overall supercapacitor performance. The TMT-PA-COF electrode and KI redox electrolyte exhibit a remarkable capacitance of 521 F g−1 at a current density of 1 A g−1 in a three-electrode configuration. The resulting asymmetric supercapacitor (TMT-PA-COF/AC//ASCs) device achieves a high operating voltage window of 1.2 V, delivering a significant energy density of 90.72 Wh kg−1 and demonstrating excellent cycling stability with 95.7% retention after 11,200 cycles. The combination of the COF electrode and KI redox electrolyte offers a promising strategy for advancing the performance and efficiency of energy storage devices.