Abstract
Due to the lower equivalent series resistance compared to other types of energy storage devices, supercapacitor electrodes can therefore be an ideal choice for energy storage. In this study, a perovskite-based metallic compound, La0.6Sr0.4Fe0.9pd0.1O3 was synthesized by the sol-gel method and combined with carbon Vulcan XC-72 to create an effective nanocomposite-based modifier for the development of mini supercapacitor. Morphological studies of the obtained compounds were carried out using a variety of characterization techniques including X-ray Diffraction (XRD), Energy Dispersive X-ray Spectroscopy (EDX), Fourier-transform infrared spectroscopy (FT-IR), and Field Emission Scanning Electron Microscope (FE-SEM) and X-ray Photoelectron Spectroscopy analysis (XPS). On the other hand, the electrochemical feasibility of the synthesized nanocomposite and the developed La0.6Sr0.4Fe0.9pd0.1O3/Vulcan XC-72 -based supercapacitor was demonstrated by applying various approaches including cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). The La0.6Sr0.4Fe0.9pd0.1O3/Vulcan XC-72 shows the highest specific capacitance (329 F/g) with a power density of 750 W/kg and an energy density of 4.8 Wh/kg at a current density of 0.01 mA/g. In order to evaluate the stability of the designed supercapacitor, long charge/discharge cycles were also carried out. After 5000 charge/discharge cycles, the specific capacity reached about 76.47 % of its original value. The present results show that the La0.6Sr0.4Fe0.9pd0.1O3/Vulcan XC-72 nanocomposite can be efficiently used as a potential material for energy storage, which may be promising for the future.
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