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Tunable Oxygen Vacancies Enable Dynamic Infrared Response for Efficient CO2 Reduction on Plasmonic BiOx
Chen Liao1, Mengyu Wang1, Xiaofeng Kang1
1International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.
Chemsuschem
|June 12, 2025
Summary
Researchers developed a novel bismuth oxide (BiOx) photocatalyst that efficiently converts CO2 into fuels using infrared light. This advancement improves CO2 utilization and offers a sustainable energy solution.
Area of Science:
- Materials Science
- Catalysis
- Renewable Energy
Background:
- Photocatalytic CO2 reduction is crucial for sustainable fuel production.
- Current methods struggle with efficient utilization of infrared light.
Purpose of the Study:
- To develop a nonmetallic plasmonic photocatalyst for enhanced CO2 reduction using infrared light.
- To tune the infrared absorption properties of the catalyst through oxygen vacancies.
Main Methods:
- Synthesis of bismuth oxide (BiOx) photocatalyst with tunable oxygen vacancies via calcination.
- Characterization using XPS, Mott-Schottky analysis, and KPFM.
- In situ DRIFTS for mechanistic studies.
- Testing CO2 reduction efficiency under UV-Vis and near-infrared (NIR) light.
Main Results:
- BiOx photocatalyst demonstrated tunable infrared absorption from 700 to 1700 nm.
- Optimized BiOx-180°C achieved efficient CO2 reduction under NIR light (>800 nm) with high C2 product selectivity (50.5%).
- Synergistic effects between interband transitions and plasmonic excitations enhanced overall product yield under full-spectrum illumination.
Conclusions:
- Tunable oxygen vacancies in BiOx effectively modulate localized surface plasmon resonance (LSPR) and catalytic activity.
- LSPR facilitates C-C coupling, promoting C2 product generation.
- This work demonstrates the potential of dynamic infrared response modulation in plasmonic semiconductors for efficient, broadband-driven photocatalytic CO2 reduction.
