A facile mixed complex synthesis method for perovskite oxides toward electrocatalytic oxygen reduction

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Perovskite oxides are crucial for electrocatalytic applications.
• Oxygen Reduction Reaction (ORR) is a key process in energy conversion devices.
• Developing efficient electrocatalysts for ORR is essential.

Purpose of the Study:

• Synthesize novel perovskite-type La(0.5+x)Sr(0.5-x)FeO3-δ oxides.
• Investigate the structural and electrochemical properties of these oxides.
• Evaluate their performance as electrocatalysts for the oxygen reduction reaction (ORR).

Main Methods:

• Facile reaction-EDTA/citric acid mixed complex sol-gel method for synthesis.
• Powder X-ray diffraction (XRD) for structural analysis.
• Scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM-EDX), transmission electron microscopy/selected area electron diffraction (TEM-SAED), and X-ray photoelectron spectroscopy (XPS) for characterization.
• Electrochemical studies in alkaline media to assess ORR performance.

Main Results:

• Successful synthesis of cubic single-phase perovskite-type La(0.5+x)Sr(0.5-x)FeO3-δ (x = 0.00, 0.10, 0.20) oxides.
• Comprehensive structural and morphological characterization confirmed the perovskite structure.
• The synthesized oxides demonstrated good electrocatalytic ORR performance in alkaline media.

Conclusions:

• The sol-gel method is effective for synthesizing perovskite-type oxides.
• La(0.5+x)Sr(0.5-x)FeO3-δ oxides exhibit promising electrocatalytic activity for ORR.
• These materials hold potential for use in electrochemical energy conversion systems.