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Atomic-Scale Observation of Sequential Oxidation Process on Co(0001).
Ruijie Hou1, Ziling Zeng1, Shaoshan Wang1
1Hangzhou Institute of Advanced Studies, Zhejiang Normal University, Hangzhou 311231, China.
The Journal of Physical Chemistry Letters
|June 3, 2022
Summary
We observed oxygen
Area of Science:
- Surface science
- Materials science
- Catalysis
Background:
- Oxygen's role in surface chemistry is vital for catalysis and oxidation.
- Understanding surface reactions requires atomic-level insights.
Purpose of the Study:
- To investigate the atomic-scale oxidation process on a cobalt (Co(0001)) surface.
- To provide a comprehensive in situ scanning tunneling microscopy (STM) study.
Main Methods:
- In situ scanning tunneling microscopy (STM) experiments.
- Density functional theory (DFT) calculations.
Main Results:
- Observed chemisorbed oxygen pairs as dumbbell features at 90 K.
- Identified a mobile p(2 × 2)-O adlayer forming at 160–250 K.
- Documented amorphous oxidation to protrusions at ≥300 K, initiating at defects.
Conclusions:
- Detailed the atomic-level oxidation pathways on Co(0001).
- Highlighted the temperature-dependent behavior of oxygen adatoms and surface oxidation.
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