Details

Autor(en) / Beteiligte

• Zhao, Jiangting
• Xiong, Zhuo
• Wang, Junyi
• Chen, Xiaoxiang
• Wan, Jianlong
• Xu, Zuwei
• Qiu, Yaqin
• Zhao, Yongchun
• Zhang, Junying

Titel

Constructing bridging oxygen vacancies in SnTa2O6−x for efficient and stable photocatalytic CO2 reduction under visible light irradiation

Ist Teil von

• Applied surface science, 2023-11, Vol.636, p.157833, Article 157833

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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. The good stability of SnTa2O6−x can be attributed to the distinct molecular configuration of CO2, which avoids filling and consuming of the oxygen vacancies. [Display omitted] •The bridging oxygen vacancies were constructed in SnTa2O6−x by an improved flame reduction method.•40-SnTa2O6−x showed 7.5 times improved visible light catalytic activity with a CO yield of 21.1 μmol h−1 g−1.•The transition of adsorption configuration of CO2 on the catalysts boosts adsorption and activation.•The bidentate configuration avoids filling of oxygen vacancies and ensures its stability. 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.