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<p>The graphite-silica (SiO<sub>2</sub>@GP) core-shell particles were formed via thermal chemical vapor deposition at 1100&#xa0;°C. The synthesis’s growth times were varied at 1, 5, 10, 30, and 60&#xa0;min. The properties of SiO<sub>2</sub>@GP particles with different growth times were systematically analyzed and investigated. At a growth time of 10&#xa0;min, major SiO<sub>2</sub> peaks and the principal of the graphene were observed. The SiO<sub>2</sub> particles and thin GP sheets covering their surfaces are clearly observed. An optimized SiO<sub>2</sub>@GP structure with a growth time of 10&#xa0;min (SiO<sub>2</sub>@GP-10) was subsequently employed as an electrode in a three-electrode supercapacitor configuration. Electrochemical performance was evaluated using cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy analyses. At a current density of 1&#xa0;A g<sup>− 1</sup>, the SiO<sub>2</sub>@GP-10 composite achieved a specific capacitance of approximately 291&#xa0;F g<sup>− 1</sup> and maintained over 40.14% of its capacitance at higher current densities.</p>

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Controlling the structural, optical, electrical, and compositional properties of silica-graphite core-shell for supercapacitor applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月26日

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  • Nguyen Tam Nguyen Truong,
  • Nguyen Hoang Lam,
  • Jae-Hak Jung,
  • Hamid Shaikh,
  • Arfat Anis,
  • Mohaseen S. Tamboli,
  • Jinjoo Jung,
  • Chang-Duk Kim,
  • Younjung Jo

摘要

The graphite-silica (SiO2@GP) core-shell particles were formed via thermal chemical vapor deposition at 1100 °C. The synthesis’s growth times were varied at 1, 5, 10, 30, and 60 min. The properties of SiO2@GP particles with different growth times were systematically analyzed and investigated. At a growth time of 10 min, major SiO2 peaks and the principal of the graphene were observed. The SiO2 particles and thin GP sheets covering their surfaces are clearly observed. An optimized SiO2@GP structure with a growth time of 10 min (SiO2@GP-10) was subsequently employed as an electrode in a three-electrode supercapacitor configuration. Electrochemical performance was evaluated using cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy analyses. At a current density of 1 A g− 1, the SiO2@GP-10 composite achieved a specific capacitance of approximately 291 F g− 1 and maintained over 40.14% of its capacitance at higher current densities.