Surface Modification of Fe-Based Perovskite Oxide via Sr_0.95Ce_0.05CoO_3-δ Infiltration: A Strategy for Thermochemical...

Area of Science:

• Materials Science
• Catalysis
• Solid-State Chemistry

Background:

• Cobalt perovskites offer high catalytic activity but lack stability.
• Iron perovskites provide stability but have limited catalytic performance.
• A composite approach aims to merge these complementary properties.

Purpose of the Study:

• To design and synthesize a composite perovskite oxide integrating Sr_0.95Ce_0.05CoO_3-δ (SCC) and Ba_0.5Sr_0.5Fe_0.8Cu_0.2O_3-δ (BSFC).
• To investigate the structural and chemical properties of the composite for enhanced catalytic applications.

Main Methods:

• Composite synthesis via infiltration of SCC precursor into BSFC scaffold.
• High-temperature X-ray diffraction (HT-XRD) and Rietveld refinement for structural analysis.
• X-ray Photoelectron Spectroscopy (XPS) for surface composition and oxidation state determination.

Main Results:

• Successful infiltration of SCC nanoparticles onto the BSFC surface.
• Both BSFC and SCC phases maintained cubic perovskite structure (Pm-3m) with excellent thermal stability up to 800 °C.
• Composite showed increased surface oxygen species and oxygen vacancy formation, indicated by XPS.

Conclusions:

• The composite perovskite oxide demonstrates superior structural integrity compared to cobalt-based counterparts.
• Enhanced oxygen vacancy concentration suggests improved catalytic potential.
• This composite material offers a promising pathway for advanced catalytic applications.