Electrochemical energy storing performances of printed LaFeO3 coated with PEDOT: PSS for hybrid supercapacitors

Developing advanced smart energy storage devices demanded new functional materials to store energy effectively and deliver power quickly. In this work, we studied the energy-storing performance of perovskite material, lanthanum ferrite (LaFeO3), prepared by the solid-state reaction method. The screen-printed LaFeO3 and graphite electrodes are used to develop hybrid supercapacitors (HSCs) with KOH electrolyte. Varying the sintering temperature of the LaFeO3 perovskite electrode (800 degrees C, 900 degrees C, and 1000 degrees C) leads to changes in the surface and crystalline properties, which impact the electrochemical properties and overall energy-storing performance of the HSC. The surface of the LaFeO3 electrode is modified with organic conducting polymer poly(3,4ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS), which enhances the energy storage of the HSC. The developed HSC based on LaFeO3, sintered at 1000 degrees C and surface modified with PEDOT: PSS, exhibited a specific capacitance of 12.007 mF center dot cm- 2 at a current density of 0.075 mA center dot cm- 2. This value is two times higher than (5.874 mF center dot cm- 2) without the surface modification of LaFeO3 at 1000 degrees C. This study provides valuable insights into the electrochemical performances of the ABO3 perovskite (LaFeO3) electrodes for the next generation of portable energy storage devices.