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

Abstract

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 °C, 900 °C, and 1000 °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(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS), which enhances the energy storage of the HSC. The developed HSC based on LaFeO₃, sintered at 1000 °C and surface modified with PEDOT: PSS, exhibited a specific capacitance of 12.007 mF∙cm⁻² at a current density of 0.075 mA∙cm⁻². This value is two times higher than (5.874 mF∙cm⁻²) without the surface modification of LaFeO₃ at 1000 °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.