Abstract
Construction of oxygen vacancies is a common strategy to improve the performance of metal oxide photocatalysts. However, the oxygen vacancies can be easily filled and consumed by the oxygen atoms of CO2 molecules during CO2 photoreduction reactions, resulting in deactivation of the catalyst. In this study, bridging oxygen vacancies were introduced into SnTa2O6 nanosheets, which remarkably enhanced the photocatalytic performance with good stability. The SnTa2O6−x obtained after 40 s of flame reduction treatment showed 7.5 times higher visible-light-activity than pristine SnTa2O6 (21.1 μmol h−1 g−1 of CO), and sustained good stability even after five cycles. Accompanied by a positive shift in the d-band center, the adsorption configuration of CO2 on the catalysts changed from monodentate to bidentate after the introduction of bridging oxygen vacancies into SnTa2O6, which is beneficial for CO2 adsorption and activation. Furthermore, the bridging oxygen vacancies in SnTa2O6−x can reduce the Gibbs free energy of COOH*, and facilitate the photo conversion of CO2 by receiving photogenerated electrons. The good stability of SnTa2O6−x can be attributed to the distinct molecular configuration of CO2, which avoids filling and consuming the oxygen vacancies.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
