Repositorio de producción científica de la Universidad de Sevilla

Structural and chemical reactivity modifications of a cobalt perovskite induced by Sr-substitution. An in situ XAS study

Opened Access Structural and chemical reactivity modifications of a cobalt perovskite induced by Sr-substitution. An in situ XAS study

Citas

buscar en

Estadísticas
Icon
Exportar a
Autor: Hueso Martos, José Luis
Holgado Vázquez, Juan Pedro
Pereniguez Rodríguez, Rosa María
González de la Cruz, Víctor Manuel
Caballero Martínez, Alfonso
Departamento: Universidad de Sevilla. Departamento de Química Inorgánica
Fecha: 2015
Publicado en: Materials Chemistry and Physics, 151, 21-33.
Tipo de documento: Artículo
Resumen: LaCoO3 and La0.5Sr0.5CoO3-δ perovskites have been studied by in situ Co K-edge XAS. Although the partial substitution of La(III) by Sr(II) species induces an important increase in the catalytic oxidation activity and modifies the electronic state of the perovskite, no changes could be detected in the oxidation state of cobalt atoms. So, maintaining the electroneutrality of the perovskite requires the generation of oxygen vacancies in the network. The presence of these vacancies explains that the substituted perovskite is now much more reducible than the original LaCoO3 perovskite. As detected by in situ XAS, after a consecutive reduction and oxidation treatment, the original crystalline structure of the LaCoO3 perovskite is maintained, although in a more disordered state, which is not the case for the Sr doped perovskite. So, the La0.5Sr0.5CoO3-δ perovskite submitted to the same hydrogen reduction treatment produces metallic cobalt, while as determined by in situ XAS spectroscopy the ...
[Ver más]
Cita: Hueso Martos, J.L., Holgado Vázquez, J.P., Pereniguez Rodríguez, R.M., González de la Cruz, V.M. y Caballero Martínez, A. (2015). Structural and chemical reactivity modifications of a cobalt perovskite induced by Sr-substitution. An in situ XAS study. Materials Chemistry and Physics, 151, 21-33.
Tamaño: 335.3Kb
Formato: PDF

URI: http://hdl.handle.net/11441/64487

DOI: 10.1016/j.matchemphys.2014.11.015

Ver versión del editor

Mostrar el registro completo del ítem


Esta obra está bajo una Licencia Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internacional

Este registro aparece en las siguientes colecciones