Enhanced Supercapacitive Performance of FeAl₂O₄ Nanoparticles with Neodymium (Nd) Doping by Sonication Method

In order to meet the demands of humanity and address the global environmental situation, it is imperative that we explore alternative energy sources and advance energy storage technology. The aim of this study was to investigate the impact of Nd-doping on the structural and electrochemical performance of FeAl₂O₄ nanoparticles (NPs). The successful synthesis of Nd-doped FeAl₂O₄ NPs) was accomplished through a simple sonication process. An evaluation was conducted on the properties of Nd-doping FeAl₂O₄ NPs) to determine their suitability for supercapacitor (SC) applications. Moreover, the specific capacitance (Cs) of Nd-doped FeAl₂O₄ NPs) reaches a maximum of 1194.69 F g⁻¹ when subjected to a current density of 1.0 A g⁻¹ compared to FeAl₂O₄ nanoparticles. Furthermore, Nd-doped FeAl₂O₄ NPs exhibited excellent cyclic stability and low impedance (R_ct = 0.07 Ω), owing to their modified morphology, making a promising material for supercapacitor SC electrodes that offer high capacity, affordability, and environmental friendliness. Our research has validated that the synthesized material can enhance the capacitive properties of transition-metal oxides with spinel structures in new, generated energy storage devices.