Improving the electrochemical performance of spray pyrolytic rare-earth cobaltite-based perovskite

Abstract

Recently there is an effort to reach highly reversible and stable materials for energy storage processes. Novel materials used in electrochemistry-based energy storage as a suitable supports for noble ones, has been predominant in the past few years. Supercapacitors, as a bridge between batteries and traditional capacitors, have attracted significant attention as new promising energy storage devices. Hybrid nanomaterials based on manganese, cobalt, and lanthanum oxides of different morphology and phase compositions were prepared using a facile single-step ultrasonic spray pyrolysis (USP) process. Transition metal oxides are considered as an ideal electrode materials for electrochemical redox transitions-based pseudocapacitors, because they can provide a variety of oxidation states for rather fast and efficient redox transitions. Strontium-doped lanthanum cobaltites (La1-xSrxCoO3- , LSCO) have shown promising catalytic performance for ORR in alkaline media. The aim of this investigation was to bring detailed insights of supercapacitive potentials of pure LSCO and LSCO hydrothermally doped by RuO2. Also, to separate influences of constituting oxides to this issue, in order to reveal the redox electrochemistry behind perovskite structures as supports for supercapacitive applications.