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Mild generation of surface oxygen vacancy on CeO2 for improved CO2 photoreduction activity.

Abstract

The vacancy defects of semiconductor photocatalysts play a key role in enhancing their photocatalytic CO2 reduction activity. In this work, CeO2 was chosen as a model catalyst and oxygen vacancy was introduced at its surface by facile and mild oxalic acid treatment followed by moderate heating in N2. Such a treatment resulted in much increased ratio of Ce3+/Ce4+ in CeO2, and the oxygen vacancy-enriched CeO2 showed remarkably enhanced photocatalytic activity in CO2 reduction, with CO being the dominant reduction product, of which the yield was about 8 times that on the pristine CeO2. In-situ FT-IR spectra showed that carbonates strongly adsorbed on the photocatalyst surface might be the main obstacle to maintaining the high CO2 reduction activity and stability of CeO2 with O vacancy.

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Supplementary files

Article information


Submitted
26 Jan 2020
Accepted
06 May 2020
First published
07 May 2020

Nanoscale, 2020, Accepted Manuscript
Article type
Paper

Mild generation of surface oxygen vacancy on CeO2 for improved CO2 photoreduction activity.

M. Wang, M. Shen, X. Jin, J. Tian, Y. Zhou, Y. Shao, L. Zhang, Y. Li and J. Shi, Nanoscale, 2020, Accepted Manuscript , DOI: 10.1039/D0NR00717J

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