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<p>Supercapacitors have garnered significant attention among today’s researchers due to their high capacitance. For supercapacitors, two-dimensional materials like graphene and its derivatives (graphene oxide [GO] and reduced graphene oxide [rGO]) and their composites with transition metal oxides are of great interest. In this study, one of the transition metal oxides, Fe<sub>2</sub>O<sub>3</sub>, was synthesized using a modified sol–gel method, and synthesized GO was used. Three composites with different concentrations of GO (10%, 20% and 30%) were formed via the ball milling method. X-ray diffraction (XRD) confirmed the rhombohedral structure of the prepared samples, with (104) as the highest peak. A carbon (103) peak also appeared in the composite samples, which confirmed the successful formation of the composite materials. The surface morphology was studied by scanning electron microscopy (SEM). Reduced agglomeration was seen in SEM images with increasing concentration of GO. Frequency-dependent dielectric and electrical properties were determined using a precision component analyzer in a range of 100&#xa0;Hz to 3&#xa0;MHz. The electrochemical performance was investigated using cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD). Fe<sub>2</sub>O<sub>3</sub> with 0% GO showed the highest specific capacitance of 152 F/g at 10&#xa0;mV/s and discharge time of 119 s at 0.5 A/g, which decreased with the increasing concentration of GO, due to oxygen-containing functional groups present in GO.</p>

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Investigating the Synergetic Effects of Fe2O3 with Variable Graphene Oxide Concentration for Supercapacitors

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Rabia Noor,
  • Waqar Mahmood,
  • M Anis-ur-Rehman

摘要

Supercapacitors have garnered significant attention among today’s researchers due to their high capacitance. For supercapacitors, two-dimensional materials like graphene and its derivatives (graphene oxide [GO] and reduced graphene oxide [rGO]) and their composites with transition metal oxides are of great interest. In this study, one of the transition metal oxides, Fe2O3, was synthesized using a modified sol–gel method, and synthesized GO was used. Three composites with different concentrations of GO (10%, 20% and 30%) were formed via the ball milling method. X-ray diffraction (XRD) confirmed the rhombohedral structure of the prepared samples, with (104) as the highest peak. A carbon (103) peak also appeared in the composite samples, which confirmed the successful formation of the composite materials. The surface morphology was studied by scanning electron microscopy (SEM). Reduced agglomeration was seen in SEM images with increasing concentration of GO. Frequency-dependent dielectric and electrical properties were determined using a precision component analyzer in a range of 100 Hz to 3 MHz. The electrochemical performance was investigated using cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD). Fe2O3 with 0% GO showed the highest specific capacitance of 152 F/g at 10 mV/s and discharge time of 119 s at 0.5 A/g, which decreased with the increasing concentration of GO, due to oxygen-containing functional groups present in GO.