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Hierarchical CeO2/Bi2MoO6 heterostructured nanocomposites for photoreduction of CO2 into hydrocarbons under visible light irradiation.
Hierarchical CeO2/Bi2MoO6 heterostructured nanocomposites for photoreduction of CO2 into hydrocarbons under visible light irradiation.
- Source :
-
Applied Surface Science . Mar2018, Vol. 434, p481-491. 11p. - Publication Year :
- 2018
-
Abstract
- CeO 2 /Bi 2 MoO 6 heterostructured microspheres with excellent and stable catalytic activity for CO 2 photoreduction were successfully synthesized via a solvothermal route. The morphology, porosity, phase, chemical structure, optical and electronic properties of the as-prepared samples are characterized. It is observed that the CeO 2 /Bi 2 MoO 6 nanocomposites with heterojunction showed greatly increased specific surface area, enhanced response to visible light, promoted charge carrier separation and transfer efficiency. Furthermore, the mechanism of CO 2 photoreduction was also investigated. It demonstrates that the CO 3 2− and HCO 3 − would be the reactive species, proving the thermodynamic feasibility of CO 2 photoreduction. Notably, the presence of basic CeO 2 on Bi 2 MoO 6 surface dramatically enhances the adsorption ability of CO 2 , which could be further transferred into b-CO 3 2− and b-HCO 3 − species as reactive intermediates for the photoreduction reaction. Consequently, introduction of CeO 2 could significantly enhance the CO 2 photoreduction performance of CeO 2 /Bi 2 MoO 6 nanocomposites, attributing to the synergistic role of CeO 2 as photosensitizer and CO 2 adsorbent. The maximum total yield of CH 3 OH and C 2 H 5 OH was 58.4 μmol gcat −1 obtained over 5C-BM, which was about 1.9 and 4.1 times higher than that over pure Bi 2 MoO 6 and pure CeO 2 . Moreover, the CeO 2 /Bi 2 MoO 6 nanocomposites exhibit excellent chemical stability and recyclability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 434
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 127034419
- Full Text :
- https://doi.org/10.1016/j.apsusc.2017.10.207