Abstract
Perovskite oxides are an important and effective class of mixed oxides which play significant role in the fields of energy storage and conversion systems. Here we present a series of cobaltite perovskite LaCoO3 particles which have been doped with 0, 5, 10, 20 and 30% of Sr2+ and have been synthesized by a combined sol-gel and molten-salt synthesis procedure, which provides regular morphology of the particles. These Sr2+ doped LaCoO3 particles have been characterized by powder X-ray diffraction, Raman spectroscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. Moreover, these Sr2+ doped LaCoO3 particles have been demonstrated as efficient catalyst for oxygen evolution reaction (OER) based on the measured specific capacitance, total charge, most accessible charge, electrochemically active surface area, and roughness factor using rotating disk and rotating ring-disk electrode techniques. The 30% Sr2+ doped LaCoO3 sample shows enhanced electrocatalytic OER activity in 0.5 M H2SO4 media compared to the LaCoO3 samples doped with 0, 5, 10, 20% Sr2+. Among all five LaCoO3 samples, the doped LaCoO3 samples demonstrate better OER activity than the undoped sample.
Highlights
Growing environmental and geopolitical problems have been arising from the shortage of fossil fuel, promoting efforts to develop cheap, ample, and eco-friendly materials for advanced energy conversion and storage systems
The overpotential requirement is a serious issue at which oxygen evolution reaction (OER) occurs (Huynh and Meyer, 2007; Yeo and Bell, 2011)
This study showed that the substitution of La2+ by Sr2+ to maintain the perovskite structure following the effects of vacancy defects, covalency, and oxygen exchange on the electrode surface during the electrocatalysis of OER
Summary
Growing environmental and geopolitical problems have been arising from the shortage of fossil fuel, promoting efforts to develop cheap, ample, and eco-friendly materials for advanced energy conversion and storage systems. We successfully synthesized uniform LaCoO3 particles with 0, 5, 10, 20, and 30% Sr2+ nominal doping levels using our facile and reliable method We characterized their composition, morphology, and structure by powder X-ray diffraction (XRD), Raman spectroscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray energy dispersive spectroscopy, and scanning electron microscopy. Morphology, and structure by powder X-ray diffraction (XRD), Raman spectroscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray energy dispersive spectroscopy, and scanning electron microscopy Their electrocatalytic performance for OER in acidic 0.5 M H2SO4 media was investigated systematically using rotating disk and rotating ring-disk electrode techniques in terms of specific capacitance, total charge, most accessible charge, electrochemically active surface area, and roughness factor.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
