IMF2017

Perovskite oxides are important and effective class of mixed oxide plays significant role in field of energy storage and conversion systems. Here we present a series of LaCoO₃ cobaltite perovskite samples which were synthesized by a combined sol-gel and molten salt method and doped with 5%, 10%, 20% and 30% of strontium. The combined sol-gel and molten salt procedure provided regular morphology of these particles, which act as a significant catalyst for oxygen evolution and reduction reactions (OER and ORR). The structural and morphological characterization of these Sr-doped LaCoO₃ samples was carried out by powder X-ray diffraction, Raman spectroscopy, Infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. Moreover, as good as our knowledge till the date we are presenting first time some useful comparison in terms of specific capacitance, total charge, most accessible charge, electrochemically active surface area, and roughness factor by using rotating disk and rotating ring-disk electrode techniques of these LaCoO₃ particles for OER. LaCoO₃ doped with 30% Sr show enhanced electrocatalytic OER activity in 0.5 M H₂SO₄ media compared to the LaCoO₃ doped with 0, 5, 10, 20% Sr. Among all five LaCoO₃ catalyst samples, the doped LaCoO₃ demonstrated better OER and ORR activity than undoped LaCoO₃.