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<p>The development of wearable and flexible electronic gadgets has increased the demand for advanced energy storage systems that can operate under contorted conditions. In this context, carbon fiber cloth (CFC) has attracted considerable attention as a flexible current collector. However, the intrinsically low surface hydrophilicity of CFC limits the uniform growth of electroactive materials. This study focuses on tuning the surface properties of CFC through mixed-acid (HNO<sub>3</sub>/H<sub>2</sub>SO<sub>4</sub>) treatment to enhance its wettability and surface reactivity. As a result, a maximum contact angle of 39.8° was achieved after 100 s of acid mixture treatment. The improved surface wettability enabled the uniform electrodeposition of cobalt vanadium selenide (CVS), forming interconnected nanosheet-like arrays on the optimized CFC substrate. Subsequently, Ni was deposited onto the optimized electrode to introduce additional redox-active sites and promote synergistic electrochemical interactions with the CVS structure, leading to enhanced charge-storage capability. As a result, a maximum areal capacitance of 2300 mF cm<sup>-2</sup> was achieved. The optimized electrode was used as an anode with activated carbon as a cathode to assemble a quasi-solid-state hybrid supercapacitor (QsHSC). The assembled device exhibited capacitance retention and Coulombic efficiency of 93% and 99%, respectively, after 10000 galvanostatic charge–discharge cycles.</p> Graphical Abstract <p></p>

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Acid Ratio-Engineered Carbon Fiber for Enhanced Interfacial Adhesion and Electrochemical Response of Ni-Coated CoVSe Electrodes for Wearable Supercapacitor Applications

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Edugulla Girija Shankar,
  • Jongwoo Hong,
  • Indhujasri Saravanan,
  • Chanmin Lee,
  • Junghyun Joo,
  • In Sun Cho,
  • Seong Chan Jun

摘要

The development of wearable and flexible electronic gadgets has increased the demand for advanced energy storage systems that can operate under contorted conditions. In this context, carbon fiber cloth (CFC) has attracted considerable attention as a flexible current collector. However, the intrinsically low surface hydrophilicity of CFC limits the uniform growth of electroactive materials. This study focuses on tuning the surface properties of CFC through mixed-acid (HNO3/H2SO4) treatment to enhance its wettability and surface reactivity. As a result, a maximum contact angle of 39.8° was achieved after 100 s of acid mixture treatment. The improved surface wettability enabled the uniform electrodeposition of cobalt vanadium selenide (CVS), forming interconnected nanosheet-like arrays on the optimized CFC substrate. Subsequently, Ni was deposited onto the optimized electrode to introduce additional redox-active sites and promote synergistic electrochemical interactions with the CVS structure, leading to enhanced charge-storage capability. As a result, a maximum areal capacitance of 2300 mF cm-2 was achieved. The optimized electrode was used as an anode with activated carbon as a cathode to assemble a quasi-solid-state hybrid supercapacitor (QsHSC). The assembled device exhibited capacitance retention and Coulombic efficiency of 93% and 99%, respectively, after 10000 galvanostatic charge–discharge cycles.

Graphical Abstract