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<p>Owing to the relatively richer reserves of cobalt than that of ruthenium, multiple valence states of cobalt, and the highly ionic Co-F bond, CoF<sub>2</sub> nanomaterial emerges as a promising candidate for the electrode material in alkaline aqueous supercapacitors. Currently, the synthesis process of CoF<sub>2</sub> nanomaterial typically requires an ultra-low temperature (0&#xa0;°C), or a high temperature (&gt; 180&#xa0;°C) and/or an inert atmosphere environment, which necessitates the use of much electric energy supply and/or costly equipment. It is of great significance to explore a cheaper preparation method for the CoF<sub>2</sub> nanomaterial. This study presents a novel and low-cost two-step method to synthesize CoF<sub>2</sub> nanoparticles as high-performance electrode materials for alkaline aqueous supercapacitors. The process involves liquid precipitation of CoF<sub>2</sub>·4H<sub>2</sub>O at room temperature, followed by Solvothermal treatment at 120&#xa0;°C in air, eliminating the need for inert atmospheres, high temperatures, or costly equipment. The resulting CoF<sub>2</sub> nanoparticles (20–100&#xa0;nm) exhibit a hierarchical porous structure, providing a large specific surface area (17.85 m<sup>2</sup>/g) and enhanced electrolyte accessibility. Electrochemical tests reveal a high voltammetric Specific capacitance of 278.1 Fg<sup>−1</sup> at 0.005 Vs<sup>−1</sup> and discharge Specific capacitance of 440.3 Fg<sup>−1</sup> at 0.5 Ag<sup>−1</sup>, attributed to combined pseudocapacitive and intercalation mechanisms. The material also demonstrates Stable cycling performance over 5000 cycles. This work offers a sustainable pathway for synthesizing advanced electrode materials for energy storage applications.</p>

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Novel synthesis of CoF2 nanoparticles for high-performance supercapacitor electrodes

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Yanli Zhang,
  • Xiaowen Zhang,
  • Qiang Zhang,
  • Li Wang,
  • Xiangming He

摘要

Owing to the relatively richer reserves of cobalt than that of ruthenium, multiple valence states of cobalt, and the highly ionic Co-F bond, CoF2 nanomaterial emerges as a promising candidate for the electrode material in alkaline aqueous supercapacitors. Currently, the synthesis process of CoF2 nanomaterial typically requires an ultra-low temperature (0 °C), or a high temperature (> 180 °C) and/or an inert atmosphere environment, which necessitates the use of much electric energy supply and/or costly equipment. It is of great significance to explore a cheaper preparation method for the CoF2 nanomaterial. This study presents a novel and low-cost two-step method to synthesize CoF2 nanoparticles as high-performance electrode materials for alkaline aqueous supercapacitors. The process involves liquid precipitation of CoF2·4H2O at room temperature, followed by Solvothermal treatment at 120 °C in air, eliminating the need for inert atmospheres, high temperatures, or costly equipment. The resulting CoF2 nanoparticles (20–100 nm) exhibit a hierarchical porous structure, providing a large specific surface area (17.85 m2/g) and enhanced electrolyte accessibility. Electrochemical tests reveal a high voltammetric Specific capacitance of 278.1 Fg−1 at 0.005 Vs−1 and discharge Specific capacitance of 440.3 Fg−1 at 0.5 Ag−1, attributed to combined pseudocapacitive and intercalation mechanisms. The material also demonstrates Stable cycling performance over 5000 cycles. This work offers a sustainable pathway for synthesizing advanced electrode materials for energy storage applications.