A facile peroxo-precursor synthesis method and structure evolution of large specific surface area mesoporous BaSnO3

Area of Science:

• Materials Science
• Solid State Chemistry
• Nanotechnology

Background:

• Barium Stannate (BaSnO3) is a functional material with potential applications.
• High surface area materials are crucial for advanced technological applications.
• Existing synthesis methods for BaSnO3 may not achieve optimal surface properties.

Purpose of the Study:

• To develop a facile and efficient strategy for synthesizing mesoporous BaSnO3.
• To achieve a significantly large surface area for BaSnO3.
• To investigate the structure-property relationships of the synthesized material.

Main Methods:

• Peroxo-precursor decomposition procedure.
• X-ray diffraction (XRD) for crystal structure analysis.
• Infrared (IR), Raman, and Mössbauer spectroscopy for structural and chemical characterization.
• Physical property measurement system for vacancy confirmation.
• Heat capacity measurements and theoretical analysis.

Main Results:

• Synthesized mesoporous BaSnO3 with a surface area of 67 m²/g, the largest reported.
• Characterized the structural evolution from peroxo-precursor to BaSnO3.
• Identified offset Sn atoms in the precursor and generated oxygen vacancies in calcined samples.
• Observed a decrease in oxygen vacancy concentration with increasing calcination temperature.

Conclusions:

• The peroxo-precursor decomposition method is effective for high surface area BaSnO3 synthesis.
• The synthesized BaSnO3 shows potential for applications in chemical sensors, NOx storage, and solar cells.
• Oxygen vacancies play a role in the material's properties and can be controlled by calcination temperature.