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Symmetry-Broken Steered Delocalization State in a Single-Atom Photocatalyst
Lei Li1, Hanghao Ying1, Panzhe Qiao2
1Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
Modifying catalyst symmetry enhances photocatalysis. Breaking symmetry in single-atom catalysts (SACs) optimizes reactant adsorption and activation, boosting catalytic performance for applications like ceria-based ruthenium SACs (Ru-CeO2).
Area of Science:
- Materials Science
- Catalysis
- Surface Chemistry
Background:
- Single-atom catalysts (SACs) offer high efficiency but are limited by inherent activity.
- Hard-soft acid-base theory guides catalyst design for optimizing reactant interactions.
Purpose of the Study:
- To explore symmetry modulation of single-atom centers for enhanced photocatalytic activity.
- To investigate the relationship between coordination symmetry and electronic properties in SACs.
Main Methods:
- Utilized ceria-based ruthenium SACs (Ru-CeO2) with varying symmetry configurations.
- Employed spectroscopy and theoretical studies to analyze electronic states and reaction mechanisms.
- Introduced symmetry breaking to create asymmetric Ru-O4 configurations (P-Ru-CeO2).
Main Results:
- Asymmetric Ru-O4 configuration (P-Ru-CeO2) exhibited highly delocalized electrons and soft acidic properties.
- Symmetry-broken Ru-CeO2 demonstrated significantly enhanced photocatalytic performance compared to pristine counterparts.
- Optimized adsorption and activation of reactant molecules were observed due to modulated electronic states.
Conclusions:
- Symmetry modulation is an effective strategy for designing and controlling atomically dispersed catalysts.
- Symmetry breaking in SACs can significantly improve photocatalytic efficiency.
- This approach advances the development of high-performance catalysts for photocatalysis.
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