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<p>Strontium cobaltite (SCO), is synthesized using the sol-gel method with varying concentrations of Cu ions to investigate the synergistic effects of Co and Cu ions on its structural and electrochemical properties. X-ray diffraction (XRD) analysis confirms the formation of a stable hexagonal phase, with an increase in crystallite size observed as Cu doping concentrations rise. Energy-dispersive spectroscopy (EDS) verifies the incorporation of Cu ions into the SCO crystal structure. Scanning electron microscopy (SEM) reveals that grain size decreases with increasing Cu doping, and micro-sized grains with hexagonal geometry are observed. Fourier transform infrared (FTIR) and Raman spectra indicate the presence of key functional groups. The electrochemical evaluation demonstrates that the specific capacitance increases with Cu doping, reaching a maximum of 1788 F/g at 0.4 A/g for 5 wt.% Cu in a 1&#xa0;M KOH electrolyte solution—representing the highest reported value with excellent reversibility. Additionally, the diffusion coefficient reaches 9.5 × 10<sup>−10</sup> cm<sup>2</sup> s<sup>−1</sup> at the highest Cu concentration. The electrode material for 5 wt.% doping shows the capacitive retention of 95% which is attributed to the decrease in its electrical resistivity. These findings highlight Cu-doped SCO as a promising candidate for energy storage applications.</p>

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Enhanced Electrochemical Performance of Strontium Cobaltite-Based Electrode for Supercapacitors by Cu Doping

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Abu-Zar Kazmi,
  • Saqib Jabbar,
  • Aminah Hameed,
  • Syed Ali Raza,
  • Suleman Ahmad,
  • Tayyaba Ghani,
  • Dilawar Ali,
  • Riaz Ahmad

摘要

Strontium cobaltite (SCO), is synthesized using the sol-gel method with varying concentrations of Cu ions to investigate the synergistic effects of Co and Cu ions on its structural and electrochemical properties. X-ray diffraction (XRD) analysis confirms the formation of a stable hexagonal phase, with an increase in crystallite size observed as Cu doping concentrations rise. Energy-dispersive spectroscopy (EDS) verifies the incorporation of Cu ions into the SCO crystal structure. Scanning electron microscopy (SEM) reveals that grain size decreases with increasing Cu doping, and micro-sized grains with hexagonal geometry are observed. Fourier transform infrared (FTIR) and Raman spectra indicate the presence of key functional groups. The electrochemical evaluation demonstrates that the specific capacitance increases with Cu doping, reaching a maximum of 1788 F/g at 0.4 A/g for 5 wt.% Cu in a 1 M KOH electrolyte solution—representing the highest reported value with excellent reversibility. Additionally, the diffusion coefficient reaches 9.5 × 10−10 cm2 s−1 at the highest Cu concentration. The electrode material for 5 wt.% doping shows the capacitive retention of 95% which is attributed to the decrease in its electrical resistivity. These findings highlight Cu-doped SCO as a promising candidate for energy storage applications.