Preparation and Magnetic Properties of Fe₃O₄@rGO Nanocomposite: Application in Aqueous Electrochemical Supercapacitor

The Fe₃O₄@reduced graphene oxide (rGO) composite has been proposed as a potentially advantageous substance for the efficient adsorption and extraction of diverse ions, particularly in heavily concentrated acidic conditions. This can be attributed to its remarkable corrosion resistance and convenient magnetic retrieval capabilities. The current study focused on the successful production and dispersion of Fe₃O₄ nanoparticles (NPs) within reduced graphene oxide (rGO) by the utilization of a glucose solution. The magnetic nanocomposites that followed were characterized using X-ray diffraction (XRD), Raman spectroscopy, and scanning electron microscopy (SEM). The investigation of the magnetic properties of Fe₃O₄ nanoparticles (NPs) in Fe₃O₄@rGO composites was conducted using electron spin resonance (ESR). The results indicate that Fe₃O₄ nanoparticles undergo a transition from a single-domain to a multi-domain ferromagnetic state. The findings of this investigation suggest that composites consisting of Fe₃O₄@rGO possess significant promise as a very effective substance for the extraction and adsorption of ions, particularly in acidic settings. Furthermore, these composite materials can be readily extracted from a solution with the application of a magnetic field. The results of this study demonstrate the efficacy of the electron spin resonance (ESR) method for investigating the magnetic properties of nanomaterials, and suggest potential applications of the Fe₃O₄@rGO composite in diverse environmental and industrial settings. At a scan rate of 50 mV/s, the composite material exhibited a peak-specific capacitance of 428.57 F/g. The obtained electrochemical test results have provided evidence suggesting that the Fe₃O₄@rGO composites synthesized by autoclave-assisted methods exhibit considerable potential as viable materials for supercapacitor applications.