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Efficient Visible-Light-Driven CO₂ Reduction Mediated by Defect-Engineered BiOBr Atomic Layers.

Ju Wu¹, Xiaodong Li¹, Wen Shi¹

¹Hefei National Laboratory for Physical Sciences at Microscale, University of Science & Technology of China, Hefei, Anhui, 230026, P.R. China.

Angewandte Chemie (International Ed. in English)

|May 16, 2018

Summary

This summary is machine-generated.

Engineered BiOBr atomic layers with oxygen vacancies significantly boost solar CO2 reduction. This defect engineering enhances light absorption and carrier separation, achieving a high CO2 conversion rate.

Keywords:

BiOBr atomic layers carbon dioxide oxygen vacancies photocatalysis surface defects

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Area of Science:

Materials Science
Photocatalysis
Surface Chemistry

Background:

Solar CO2 reduction is crucial for sustainable energy but limited by poor photoabsorption, charge separation, and CO2 activation.
Defect engineering offers a promising strategy to overcome these limitations in photocatalysts.

Purpose of the Study:

To optimize solar CO2 reduction efficiency by engineering defects in BiOBr atomic layers.
To investigate the role of oxygen vacancies in enhancing photocatalytic activity.

Main Methods:

Fabrication of BiOBr atomic layers with deliberate oxygen vacancies.
Characterization using X-ray absorption near-edge structure and electron paramagnetic resonance spectroscopy.
Theoretical calculations and in situ Fourier-transform infrared spectroscopy for mechanistic studies.
Surface photovoltage and time-resolved fluorescence spectroscopy to analyze carrier dynamics.

Main Results:

Oxygen vacancies were successfully introduced into BiOBr atomic layers, confirmed by spectroscopic techniques.
Defect levels created by oxygen vacancies extended photoresponse to the visible-light region.
Oxygen vacancies facilitated CO2 conversion to COOH* intermediates and promoted charge carrier separation.
Oxygen-deficient BiOBr atomic layers achieved a CO formation rate of 87.4 μmol g⁻¹ h⁻¹ under visible light.

Conclusions:

Defect engineering, specifically creating oxygen vacancies, significantly enhances the performance of BiOBr atomic layers for solar CO2 reduction.
The optimized photocatalyst demonstrates superior efficiency compared to pristine BiOBr and other reported single photocatalysts.
This work provides a pathway for designing efficient visible-light-driven photocatalysts for CO2 conversion.