Structural and electrocatalytic properties of molten core Sn@SnOx nanoparticles on ceria
| Autor: | Luca Bardini, Marta Boaro, Alessandro Trovarelli, Jordi Llorca, Alfonsina Pappacena, Montserrat Dominguez-Escalante |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Química, Universitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
H2 electroxidation
Materials science Inorganic chemistry Oxide Electrochemical analysis Nanoparticle chemistry.chemical_element molten core Sn@SnOx nanoparticles ceria SOFC H2 electroxidation 02 engineering and technology 010402 general chemistry 01 natural sciences Catalysis chemistry.chemical_compound Enginyeria química [Àrees temàtiques de la UPC] Ceria SOFC High-resolution transmission electron microscopy molten core Sn@SnOx nanoparticles Fuel cells General Environmental Science Core-shell Piles de combustible d'òxid sòlid Process Chemistry and Technology 021001 nanoscience & nanotechnology Tin oxide 0104 chemical sciences Amorphous solid ceria Electroquímica chemistry Solid oxide fuel cell 0210 nano-technology Triple phase boundary Tin Molten tin |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | The morphological and chemical modifications following reduction in hydrogen at 873 K of stannic oxide deposited on ceria particles were studied in order to gain insights into the nature of Ce-Sn interaction under reducing atmosphere, simulating the operating conditions in a solid oxide fuel cell. It is shown that the co-presence of the two materials improves the power output of fuel cells up to a factor of 10 when compared to ceria alone. Through high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and in-situ X-ray diffraction (XRD) data we show the formation of a novel system made up of nanoparticles composed of a molten Sn0 core capped by an amorphous tin oxide layer. SnOx shell acts as a binding agent which stabilizes Sn0 nanoparticles on ceria even after reductive treatment at temperatures well above the melting point of tin. This occurs through an interfacial redox communication between ceria and tin, likely involving a transfer of oxygen from ceria to the metal and electrons from metal to ceria. It is highlighted how the Sn@SnOx nanostructures and their spontaneous formation could be used as a model for the development of catalyst nano-assembly comprising an amorphous metal oxide triple phase boundary, opening the way for a new paradigm in the development of multifunctional catalytic systems |
| Databáze: | OpenAIRE |
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