Unraveling Ce3+ detection at the surface of ceria nanopowders by UPS analysis

A sequential analysis using Ultra-violet Photoelectron Spectroscopy (UPS) and X-ray Photoelectron Spectroscopy (XPS) on ceria nanopowders has been implemented to identify the influence of the X-ray beam on the surface of this oxide. For the first time, UPS analysis evidenced the photoreductive effec...

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Published in:Physical chemistry chemical physics : PCCP 2022-09, Vol.24 (37), p.22815-22822
Main Authors: Cardenas, Luis, Clément Molinet-Chinaglia, Loridant, Stéphane
Format: Article
Language:English
Subjects:
Catalysis
Cerium oxides
Chemical Sciences
Photoelectrons
Sequential analysis
X ray photoelectron spectroscopy
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creator Cardenas, Luis
Clément Molinet-Chinaglia
Loridant, Stéphane
description A sequential analysis using Ultra-violet Photoelectron Spectroscopy (UPS) and X-ray Photoelectron Spectroscopy (XPS) on ceria nanopowders has been implemented to identify the influence of the X-ray beam on the surface of this oxide. For the first time, UPS analysis evidenced the photoreductive effect of XPS analysis on ceria after an oxidative in situ pretreatment, leading to an overestimation of the Ce3+/Ce4+ ratio obtained by XPS. Based on this spectroscopy methodology, UPS imposes itself as a leading technique for analyzing powders with minimal impact on the authentic chemical state, thus paving the way for identifying the real ratio of Ce4+ and Ce3+ of ceria after oxidative and reductive in situ treatments.
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subjects Catalysis
Cerium oxides
Chemical Sciences
Photoelectrons
Sequential analysis
X ray photoelectron spectroscopy
title Unraveling Ce3+ detection at the surface of ceria nanopowders by UPS analysis
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