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<p>The serious energy crisis has made energy storage technology a cutting-edge research priority. In the current study, pure and Co-doped ZnFe₂O₄ nanocomposites integrated with graphene oxide (GO) sheets were synthesized via the hydrothermal method for supercapacitor applications. Different characterization techniques, such as XRD, FTIR, and Raman, confirmed the formation of Co-doped. The crystallite sizes of the synthesized nanoparticles range from 19.07 to 29.28&#xa0;nm. The surface morphology, particle size, and the presence of dopants in the crystal lattice of Co-ZnFe2O4 were confirmed by SEM, TEM, and XPS. SEM imaging revealed the formation of irregular nanostructures, with particles ranging from 40 to 100&#xa0;nm. The supercapacitive behavior of the nanocomposite was evaluated using Cyclic Voltammetry (CV), Galvanostatic Charge-discharge (GCD), and Electrochemical impedance spectroscopy (EIS). The specific capacitance (Csp) values indicated that incorporation of dopant and graphene oxide led to a significant enhancement in the material’s capacitance. The electrochemical supercapacitor analysis indicated that Co₀.<sub>3</sub>Zn₀.<sub>7</sub>Fe₂O₄-GO exhibits the highest performance, delivering a specific capacitance of 2813&#xa0;F g ¹ and retaining more than 90% of its capacitance after 1000 cycles. In comparison, ZnFe<sub>2</sub>O<sub>4</sub>, ZnFe<sub>2</sub>O<sub>4</sub>-GO, and Co<sub>0.3</sub>Zn<sub>0.7</sub>Fe<sub>2</sub>O<sub>4</sub> exhibit specific capacitance values of 375.2, 562.2, and 1400&#xa0;F g-1, respectively. EIS results demonstrated that cobalt doping and GO incorporation reduced the overall charge transfer resistance of the materials. The superior performance of Co<sub>0.3</sub>Zn<sub>0.7</sub>Fe₂O₄-GO is attributed to increased electroactive sites, reduced charge transfer resistance, and enhanced energy density.</p> Graphical Abstract <p></p>

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Tailoring and assessment of supercapacitive performance of CoxZn1−xFe2O4 nanoarchitectures decorated on 2D Graphene oxide sheets

  • 期刊论文

  • 发表日期：

    2026年7月2日

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  • Saliha Kaleem,
  • Amna Bashir,
  • Rabia Bashir,
  • It Ee Lee,
  • Aliya Fazal,
  • Syed Mustansar Abbas,
  • Hafsa Yasmeen,
  • Qamar Wali,
  • Muhammad Aamir

摘要

The serious energy crisis has made energy storage technology a cutting-edge research priority. In the current study, pure and Co-doped ZnFe₂O₄ nanocomposites integrated with graphene oxide (GO) sheets were synthesized via the hydrothermal method for supercapacitor applications. Different characterization techniques, such as XRD, FTIR, and Raman, confirmed the formation of Co-doped. The crystallite sizes of the synthesized nanoparticles range from 19.07 to 29.28 nm. The surface morphology, particle size, and the presence of dopants in the crystal lattice of Co-ZnFe2O4 were confirmed by SEM, TEM, and XPS. SEM imaging revealed the formation of irregular nanostructures, with particles ranging from 40 to 100 nm. The supercapacitive behavior of the nanocomposite was evaluated using Cyclic Voltammetry (CV), Galvanostatic Charge-discharge (GCD), and Electrochemical impedance spectroscopy (EIS). The specific capacitance (Csp) values indicated that incorporation of dopant and graphene oxide led to a significant enhancement in the material’s capacitance. The electrochemical supercapacitor analysis indicated that Co₀.3Zn₀.7Fe₂O₄-GO exhibits the highest performance, delivering a specific capacitance of 2813 F g ¹ and retaining more than 90% of its capacitance after 1000 cycles. In comparison, ZnFe2O4, ZnFe2O4-GO, and Co0.3Zn0.7Fe2O4 exhibit specific capacitance values of 375.2, 562.2, and 1400 F g-1, respectively. EIS results demonstrated that cobalt doping and GO incorporation reduced the overall charge transfer resistance of the materials. The superior performance of Co0.3Zn0.7Fe₂O₄-GO is attributed to increased electroactive sites, reduced charge transfer resistance, and enhanced energy density.

Graphical Abstract