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Enhanced Solar Photothermal Catalysis over Solution Plasma Activated TiO2
Fei Yu1, Changhua Wang1, Yingying Li1
1Key Laboratory of UV-Emitting Materials and Technology of Chinese Ministry of Education Northeast Normal University Changchun 130024 China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|August 25, 2020
Summary
This study enhances photocatalyst performance by creating shallow defects in yellow titanium dioxide (TiO2). This improves charge transfer, boosting efficiency for CO2 reduction and pollutant removal under visible and UV light.
Area of Science:
- Materials Science
- Photocatalysis
- Semiconductor Physics
Background:
- Colored wide-bandgap semiconductor oxides show promise as visible-light photocatalysts.
- Charge recombination at deep-level defects limits their catalytic activity.
- Addressing this defect-mediated recombination is crucial for practical applications.
Purpose of the Study:
- To develop a strategy for enhancing the photoactivity of colored wide-bandgap oxides.
- To create shallow-level defects to facilitate electron migration from deep-level defects.
- To improve photocatalytic efficiency for energy and environmental applications.
Main Methods:
- A solution plasma processing (SPP) technique was employed.
- Presynthesized yellow titanium dioxide (TiO2) with oxygen vacancies (Ov) was processed.
- Hydrogen dopants were incorporated, creating shallow-level defects above deep Ov levels.
Main Results:
- SPP-treated TiO2 retained its visible light absorption.
- A 300-fold increase in CO2 reduction conversion rate under solar light was observed.
- A 7.5-fold increase in acetaldehyde removal rate under UV light was achieved.
Conclusions:
- The proposed strategy effectively enhances the photoactivity of colored wide-bandgap oxides.
- Shallow-level defects facilitate electron migration, reducing charge recombination.
- This approach offers a pathway for advanced photocatalysts in energy and environmental remediation.
