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Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles
Published on: June 25, 2018
Crystallographically Resolved Hydrogen Uptake Response in Palladium Nanopowders Revealed by Modulation-Excitation
Keiko Kojima1, Takeharu Sugiyama1, Ken-Ichi Shimizu2,3
1Research Center for Synchrotron Light Applications (RCSLA), Kyushu University, 6-1, Kasugakoen, Kasuga-shi, Fukuoka816-8580Japan.
The Journal of Physical Chemistry Letters
|August 13, 2026
Summary
Researchers used X-ray diffraction to study how palladium absorbs hydrogen. They found that different crystal planes respond at different speeds, revealing dynamic heterogeneity in hydrogen storage materials.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Nanotechnology
Background:
- Hydrogen absorption in palladium (Pd) is crucial for hydrogen storage and catalysis.
- Thermodynamics of H2 uptake in Pd are well-studied, but dynamic, crystallographic aspects are less understood.
Purpose of the Study:
- To investigate the dynamic aspects of hydrogen absorption in palladium nanopowders at a crystallographically resolved level.
- To understand the kinetics of hydrogen-induced lattice expansion in Pd.
Main Methods:
- Modulation-excitation synchrotron X-ray diffraction (ME-XRD) was used.
- Phase-sensitive detection (PSD) was employed to analyze the response of individual Bragg reflections.
- Periodic alternation between 10% H2/He and pure He gas atmospheres was applied.
Main Results:
- Apparent response times for hydrogen uptake varied across different crystallographic planes.
- The order of response times was (220) → (200) → (111) → (311) → (222).
- This indicates crystallographically resolved dynamic heterogeneity in the hydrogen uptake process.
Conclusions:
- ME-XRD successfully revealed dynamic heterogeneity in hydrogen absorption kinetics in Pd nanopowders.
- The findings provide insights into the mechanisms of hydrogen storage and catalytic hydrogenation.
- This technique is powerful for studying kinetic heterogeneity in advanced materials.
