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<p>Supercapacitors exhibit limitations such as low energy density, high self-discharge rates, and degradation of electrochemical performance over extended cycling. This study presents the development of a high-performance asymmetric supercapacitor by synthesizing novel ZnO-VSe<sub>2</sub> nanocomposites through wet-chemical methods, aiming to enhance capacity, energy density, and durability. The capacitive performance of these materials was systematically evaluated in an aqueous alkaline electrolyte (KOH) at a concentration of 2&#xa0;M. ZnO-VSe<sub>2</sub> composite demonstrates superior electrochemical energy storage capabilities, achieving a specific capacitance of 898&#xa0;F/g and reducing overall resistance, enabling rapid electrolyte diffusion. These optimized electrochemical characteristics underscore the potential of ZnO-VSe<sub>2</sub> for energy storage applications. Specifically, the ZnO-VSe<sub>2</sub>||AC asymmetric supercapacitor achieved an impressive capacitance of 260&#xa0;F/g, an energy density of 71 Wh/kg, and a maximum power output of 6948&#xa0;W/kg, along with a remarkable stability of 89.1% at a current density of 10&#xa0;A/g over 5000 cycles. The proposed methodology offers a cost-effective and promising approach for evolving high-energy hybrid supercapacitors for energy storage applications.</p>

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Design of ZnO–VSe2 nanocomposite for high performance asymmetric supercapacitors

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年5月21日

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  • Danish Arif,
  • Rajwali Khan,
  • Atta Ullah Shah,
  • Kashif Safeen,
  • Khalid M. Alotaibi,
  • Hayat Ullah,
  • Muhammad Zia Ullah Shah,
  • Wubshet Mekonnen Girma,
  • Akif Safeen

摘要

Supercapacitors exhibit limitations such as low energy density, high self-discharge rates, and degradation of electrochemical performance over extended cycling. This study presents the development of a high-performance asymmetric supercapacitor by synthesizing novel ZnO-VSe2 nanocomposites through wet-chemical methods, aiming to enhance capacity, energy density, and durability. The capacitive performance of these materials was systematically evaluated in an aqueous alkaline electrolyte (KOH) at a concentration of 2 M. ZnO-VSe2 composite demonstrates superior electrochemical energy storage capabilities, achieving a specific capacitance of 898 F/g and reducing overall resistance, enabling rapid electrolyte diffusion. These optimized electrochemical characteristics underscore the potential of ZnO-VSe2 for energy storage applications. Specifically, the ZnO-VSe2||AC asymmetric supercapacitor achieved an impressive capacitance of 260 F/g, an energy density of 71 Wh/kg, and a maximum power output of 6948 W/kg, along with a remarkable stability of 89.1% at a current density of 10 A/g over 5000 cycles. The proposed methodology offers a cost-effective and promising approach for evolving high-energy hybrid supercapacitors for energy storage applications.