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Enhancing Stability of Surface Au under Oxidizing Conditions through Reduced Bulk Au Content
Jianyu Wang1,2, Xiaobo Chen1,2, Chaoran Li1,2
1Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, New York 13902, United States.
The Journal of Physical Chemistry Letters
|October 15, 2024
Summary
Lowering gold content in copper-gold nanoparticles surprisingly enhances surface stability. This finding challenges assumptions about precious metal reservoirs and impacts nanoparticle design for catalysis.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Precious metal content is often assumed to enhance nanoparticle stability by acting as a reservoir.
- Understanding surface behavior under different atmospheric conditions is crucial for catalyst design.
Purpose of the Study:
- To investigate the surface segregation and oxidation of copper-gold (Cu-Au) nanoparticles with varying compositions.
- To determine how bulk gold content affects surface atom stability under oxidizing conditions.
Main Methods:
- Ambient pressure X-ray photoelectron spectroscopy (AP-XPS) was used to analyze Cu-Au nanoparticles.
- The study examined nanoparticle behavior under hydrogen (H2) and oxygen (O2) atmospheres.
Main Results:
- Au-rich nanoparticles formed a continuous, oxidizable gold-enriched shell.
- Au-poor nanoparticles developed stable, embedded gold clusters on the surface.
- Lower bulk gold content led to more stable surface gold atoms in O2.
Conclusions:
- Reducing bulk gold content enhances the stability of surface gold atoms in Cu-Au nanoparticles under oxidizing conditions.
- This challenges the reservoir assumption and offers new insights for designing stable nanoparticle catalysts.
