Synthesis of <scp>FeVO₄</scp> nanoparticles using sol‐gel auto‐combustion method and their application in supercapacitors

Abstract

Abstract Iron vanadate (FeVO 4 ) nanoparticles (NPs) were synthesized using the sol‐gel auto‐combustion technique, yielding a triclinic nanostructure as revealed by X‐ray diffraction (XRD). The average size, crystalline structure, and morphology of the nanoparticles were analyzed using field emission scanning electron microscopy (FESEM). Energy‐dispersive X‐ray spectroscopy (EDX) was used to investigate the elemental content and purity of the FeVO 4 NPs. Fourier transform infrared spectroscopy (FTIR) confirmed the surface stretching frequency of the FeVO 4 NPs. Using a doctor blade, the produced FeVO 4 NPs were applied to the surface of a stainless steel (SS) substrate. The fabricated electrode was examined using GCD, EIS, and CV techniques. The absorption spectra exhibited strong absorbance in the visible range, with a band gap of 3.43 eV. Additionally, the FeVO 4 electrode showed supercapacitor properties, with a maximum specific capacitance of 1151.05 F/g in a 1 M KOH electrolyte at a scan rate of 5 mV/s. These results indicate that the prepared FeVO 4 electrode is promising for supercapacitor application due to their excellent electrochemical performance.