Strain Field in Ultrasmall Gold Nanoparticles Supported on Cerium-Based Mixed Oxides. Key Influence of the Support Redox State

Miguel Lopez-Haro (1, 2) , Kenta Yoshida (3) , Eloy Del Rio (2) , Jose A. Perez-Omil (2) , Edward D. Boyes (3) , Susana Trasobares (2) , Jian-Min Zuo (4) , Pratibha L. Gai (3) , Jose J. Calvino (2)

1 LEMMA - Laboratoire d'Etude des Matériaux par Microscopie Avancée
2 DCMIMQ - Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
3 Department of Chemistry [York, UK]
4 UIUC - University of Illinois at Urbana-Champaign [Urbana]

Using a method that combines experimental and simulated Aberration-Corrected High Resolution Electron Microscopy images with digital image processing and structure modeling, strain distribution maps within gold nanoparticles relevant to real powder type catalysts, i.e., smaller than 3 nm, and supported on a ceria-based mixed oxide have been determined. The influence of the reduction state of the support and particle size has been examined. In this respect, it has been proven that reduction even at low temperatures induces a much larger Compressive strain on the first 111 planes at the; interface. This increase in compression fully explains, in accordance with previous DFT calculations, the loss of CO adsorption capacity of the interface area previously reported for Au supported on ceria-based oxides.

Mots clés: Electron-Microscopy Techniques; Fuel-Cell Applications; CO Oxidation; Catalytic-Properties; Hydrogen-Production; Zirconia Catalysts; HREM Images

Domaines: Physique [physics]

Miguel Lopez-Haro, Kenta Yoshida, Eloy Del Rio, Jose A. Perez-Omil, Edward D. Boyes, et al.. Strain Field in Ultrasmall Gold Nanoparticles Supported on Cerium-Based Mixed Oxides. Key Influence of the Support Redox State. Langmuir, 2016, 32 (17), pp.4313-4322. ⟨10.1021/acs.langmuir.6b00758⟩. ⟨cea-01851585⟩