High-Resolution Spectroscopy of Europium-Doped Ceria as a Tool To Correlate Structure and Catalytic Activity

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• 作者：Philipp-Alexander Primus ; Thomas Ritschel ; Pilar Y. Sig眉enza ; Miguel A. Cauqui ; Juan C. Hern谩ndez-Garrido ; Michael U. Kumke
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：October 9, 2014
• 年：2014
• 卷：118
• 期：40
• 页码：23349-23360
• 全文大小：652K
• ISSN：1932-7455

文摘

Site-selective emission spectra of Eu³⁺-doped CeO₂ nanoparticles up to the ⁵D₀鈥?sup>7F₅ transition were recorded under cryogenic conditions to identify the local structure around the Eu³⁺ dopants in ceria. It is found that pretreatment conditions are crucial for the redistribution of dopants from a broad variety of environments to six well-defined lattice sites. The influence of the dopant and the host structure on the catalytic activity was investigated. A relationship between structure and reactivity is discussed. It is shown that oxygen transport is most efficient in particles with a pronounced amorphous character.