Ag/CeO2 Nanocomposites Obtained by Deposition-Precipitation, Studied by XPS

被引：2
|
作者：
Natile, Marta Maria [1 ,2 ]
Galcnda, Alessandro [3 ]
Gliscnti, Antonclla [3 ]
机构：
[1] CNR ISTM, I-35131 Padua, Italy
[2] Dipartimento Sci Chim, I-35131 Padua, Italy
[3] Univ Padua, Dipartimento Sci Chim, Via Marzolo 1, I-35131 Padua, Italy
来源：
SURFACE SCIENCE SPECTRA | 2009年 / 16卷 / 01期
关键词：
silver; ceria; cerium dioxide; nanocomposites; methanol oxidation; fuel cells;
D O I：
10.1116/11.20070405
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Ag/CeO2 nanocomposite powders were prepared by a deposition-precipitation procedure. The supporting nanosized ceria was obtained by precipitation at 273 K (in presence of 11,02). The samples are characterized by a nominal (i.e. calculated from the weighted amount of precursors) Ag/Ce wt. ratio of 2% (Accession #1148) and 7% (Accession #1149). The surface properties and the influence of the Ag/Ce atomic ratio are investigated by means of XPS (using a standard Al K alpha source). Besides the wide scan spectra, detailed spectra for the Ce 3d, Ce 4d, Ag 3d and O is regions and related data are presented and discussed. XPS analysis reveals the presence of small amounts of silver oxides (AgO is observed in the sample with lower Ag/Ce wt. ratio while Ag2O seems to be prevalent in the sample richer in Ag). in both the samples, the surface Ag/Ce atomic ratio obtained from XPS data is rather similar to the nominal one. 2009 American Vacuum Society.
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页码：27 / 35
页数：9
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