Rich oxygen vacancies mediated bismuth oxysulfide crystals towards photocatalytic CO2-to-CH4 conversion

Oxygen vacancy-rich bismuth oxysulfide (Bi 2 O 2 S) with layered structure was prepared for efficient photocatalytic CO 2 reduction under visible light irradiation. The existence of rich oxygen vacancies in Bi 2 O 2 S, which was proven by sufficient characterization, can provide abundant active site...

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Bibliographic Details
Published in:Science China materials 2021-09, Vol.64 (9), p.2230-2241
Main Authors: Jiang, Lisha, Li, Yuan, Wu, Xiaoyong, Zhang, Gaoke
Format: Article
Language:English
Subjects:
Bismuth
Carbon dioxide
Chemistry and Materials Science
Chemistry/Food Science
Conversion
Lattice vacancies
Light irradiation
Materials Science
Methane
Oxygen
Photocatalysis
Reduction
Vacancies
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Summary:Oxygen vacancy-rich bismuth oxysulfide (Bi 2 O 2 S) with layered structure was prepared for efficient photocatalytic CO 2 reduction under visible light irradiation. The existence of rich oxygen vacancies in Bi 2 O 2 S, which was proven by sufficient characterization, can provide abundant active sites, improve CO 2 adsorption and activation abilities and boost the separation efficiency of photogenerated carriers, as determined by theoretical and experimental analyses. As a result, Bi 2 O 2 S with rich oxygen vacancies achieves excellent CO 2 conversion with a CH 4 production of 65.8 µmol g −1 under 90 min of visible light irradiation, which was 27-fold higher than the pristine Bi 2 O 2 S. The mechanism of photocatalytic conversion of CO 2 to CH 4 was also determined by in situ FT-IR analyses. This study provides an in-depth understanding of the development of Bi-O-S system photocatalysts through defect engineering for photocatalytic CO 2 reduction.
ISSN:2095-8226
2199-4501
DOI:10.1007/s40843-020-1622-8