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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.

Authors :
Dai, Weili
Hu, Xu
Wang, Tengyao
Xiong, Wuwan
Luo, Xubiao
Zou, Jianping
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