Structural Surface Investigations of Cerium-Zirconium Mixed Oxide Nanocrystals with Enhanced Reducibility

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• 作者：Juan C. Hern&aacute ; ndez ; Ana B. Hungr&iacute ; a ; Jos&eacute ; A. P&eacute ; rez-Omil ; Susana Trasobares ; Seraf&iacute ; n Bernal ; Paul A. Midgley ; Ali Alavi ; Jos&eacute ; J. Calvino
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：July 5, 2007
• 年：2007
• 卷：111
• 期：26
• 页码：9001 - 9004
• 全文大小：331K
• 年卷期：v.111,no.26(July 5, 2007)
• ISSN：1932-7455

文摘

High-resolution electron microscopy, high-angle annular dark field images, electron tomography data, anddensity functional theory calculations are presented that show the occurrence of significant structural andsurface modifications in a nanocrystalline sample of cerium-zirconium mixed oxide upon high-temperaturereduction with hydrogen followed by mild oxidation. Our findings may lend further support to a recentlyproposed model in accordance with which the enhanced reducibility exhibited by the mixed oxide after thistreatment is due to parallel modifications occurred in its surface chemistry.