A high-temperature in situ cell with a large solid angle for fluorescence X-ray absorption fine structure measurement

Area of Science:

• Materials Science
• Analytical Chemistry
• Spectroscopy

Background:

• In situ X-ray absorption fine structure (XAFS) spectroscopy is crucial for understanding material behavior under reaction conditions.
• Existing in situ cells often have limitations in solid angle coverage and temperature range.
• Studying dynamic structural changes in catalysts at high temperatures is essential for optimizing performance.

Purpose of the Study:

• To design and evaluate a novel high-temperature in situ cell for fluorescence XAFS.
• To achieve a large solid angle for efficient data collection.
• To enable the study of structural transformations in materials during high-temperature reactions.

Main Methods:

• Development of a high-temperature in situ cell with a large fluorescence XAFS window (116 mm diameter).
• Incorporation of a localized heater capable of reaching 873 K.
• Measurement of a Pt-SnO2 thin layer on a Si substrate under reaction conditions.
• Analysis of XAFS spectra differences between pre-reaction and in-situ states.

Main Results:

• The developed cell provides a large half-cone angle of 56°, enhancing spectral collection efficiency.
• Local heating up to 873 K was successfully achieved for sample analysis.
• In situ measurements revealed structural changes in the Pt-SnO2 thin layer during high-activity reactions.

Conclusions:

• The high-temperature in situ XAFS cell is effective for studying dynamic structural changes in materials.
• The large solid angle and high-temperature capability facilitate detailed operando analysis.
• This technology enables a deeper understanding of catalytic mechanisms and material degradation.