1. Surface nickel particles generated by exsolution from a perovskite structure
- Author
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Fabiola N. Agüero, Luis E. Cadús, María Asunción Fernández, and Ana M. Beltrán
- Subjects
Surface (mathematics) ,Materials science ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Inorganic Chemistry ,Materials Chemistry ,Perovskites ,Physical and Theoretical Chemistry ,Porosity ,High-resolution transmission electron microscopy ,Perovskite (structure) ,Range (particle radiation) ,Dopant ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Exsolution process ,Ni particles ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Nickel ,chemistry ,Chemical engineering ,Ceramics and Composites ,TEM ,Reduction conditions ,0210 nano-technology - Abstract
LaAl1-xNixO3 (with x = 0.05 and 0.2) perovskite oxides were successfully synthesized and its behavior under reduction atmosphere was studied. HRTEM and STEM studies, coupled to HAADF and EDX detection, allowed to evidence the Ni exsolution process to the surface of the solid and to build nano-catalytic centers. The size of these centers is independent of the reduction conditions in the range studied. The high specific surface of the raw material, its porosity and the structure defects could be responsible of the low temperature at which the exsolution process starts. The content of Ni dopants allows the control of Ni centers size on the surface and the synthesis method provides Ni-nanoparticles strongly anchored to the resultant support.
- Published
- 2019