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Tuning surface oxides on PdIn(111) alloys for selective CO2 activation pathways at ambient pressure
Siwoo Noh1,2, Jiwon Park3, Beomgyun Jeong4
1Department of Accelerator Science, Korea University, Sejong 30019, South Korea.
Chemical Communications (Cambridge, England)
|August 20, 2025
Summary
Surface oxides on palladium-indium (PdIn) alloys are tuned by redox reactions. This creates reactive sites that control catalytic carbon dioxide (CO2) activation pathways on PdIn surfaces.
Area of Science:
- Surface science
- Catalysis
- Materials science
Background:
- Palladium-indium (PdIn) alloys are promising catalysts.
- Understanding surface oxide behavior is crucial for catalytic applications.
- Tuning alloy surfaces can enhance catalytic activity and selectivity.
Purpose of the Study:
- To elucidate the redox-mediated tuning of surface oxides on PdIn(111) alloys.
- To investigate the formation and role of surface oxides in CO2 activation.
- To understand how interfacial oxide sites modulate catalytic pathways.
Main Methods:
- Atomic-scale ambient-pressure scanning tunneling microscopy (AP-STM) imaging.
- Synchrotron-based ambient-pressure X-ray photoelectron spectroscopy (AP-XPS).
Main Results:
- Redox reactions tune surface oxides on PdIn(111) alloys.
- Segregation of palladium-indium-oxide (Pd-In-Ox) nanoclusters forms reactive interfacial sites.
- These sites modulate selective catalytic CO2 activation pathways.
Conclusions:
- Surface oxide engineering on PdIn alloys is achievable through redox control.
- Reactive interfacial oxide sites are key to selective CO2 activation.
- This study provides fundamental insights into heterogeneous catalysis on alloys.
