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

2007; American Chemical Society; Volume: 111; Issue: 26 Linguagem: Inglês

10.1021/jp072466a

1932-7455

Juan Carlos Hernández‐Garrido, Ana B. Hungría, José A. Pérez‐Omil, Susana Trasobares, Serafı́n Bernal, Paul A. Midgley, Ali Alavi, José J. Calvino,

Copper-based nanomaterials and applications

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