Structural and morphological alterations induced by cobalt substitution in LaMnO3 perovskites
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Título: | Structural and morphological alterations induced by cobalt substitution in LaMnO3 perovskites |
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Autor/es: | Flores-Lasluisa, Jhony Xavier | Huerta Arráez, Francisco | Cazorla-Amorós, Diego | Morallon, Emilia |
Grupo/s de investigación o GITE: | Electrocatálisis y Electroquímica de Polímeros | Materiales Carbonosos y Medio Ambiente |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales |
Palabras clave: | LaMnO3 sol–gel synthesis | Cobalt-induced changes | Structural analysis | Materials for ORR and OER |
Área/s de conocimiento: | Química Física | Química Inorgánica |
Fecha de publicación: | 15-nov-2019 |
Editor: | Elsevier |
Cita bibliográfica: | Journal of Colloid and Interface Science. 2019, 556: 658-666. doi:10.1016/j.jcis.2019.08.112 |
Resumen: | The chemical composition of a LaMnO3 perovskite was modified sequentially by an improved sol–gel method to include cobalt centers in some B sites formerly occupied by Mn. In this way, a representative set of materials of general formula LaMn1-xCoxO3 was obtained whose composition extends from LaMnO3 to LaCoO3. These perovskites, as promising materials for oxygen reduction or oxygen evolution reactions, were characterized by several imaging (SEM), spectroscopic (XPS, EDX) and diffraction (XRD) techniques to elucidate their structure and to demonstrate the existence of composition differences between the catalytic surface and the bulk material. Specifically, it was found that lanthanum ions prevail at the surface of the catalyst but high cobalt-substitution levels stimulate the surface enrichment in B cations in their respective higher oxidation states (Mn4+ and Co3+ against Mn3+ and Co2+). This phenomenon opens the possibility of tuning their electrocatalytic properties and to synthesize suitable materials for electrochemical reactions involving molecular oxygen. |
Patrocinador/es: | The authors thank MINECO and FEDER (MAT2016-76595-R) for the financial support. J.X.F.-L. gratefully acknowledges MINECO for the financial support through FPI contract (BES-2017-081598). |
URI: | http://hdl.handle.net/10045/96432 |
ISSN: | 0021-9797 (Print) | 1095-7103 (Online) |
DOI: | 10.1016/j.jcis.2019.08.112 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2019 Elsevier Inc. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1016/j.jcis.2019.08.112 |
Aparece en las colecciones: | INV - MCMA - Artículos de Revistas INV - GEPE - Artículos de Revistas |
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Archivo | Descripción | Tamaño | Formato | |
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2019_Flores-Lasluisa_etal_JColloidInterfaceSci_final.pdf | Versión final (acceso restringido) | 1,73 MB | Adobe PDF | Abrir Solicitar una copia |
2019_Flores-Lasluisa_etal_JColloidInterfaceSci_preprint.pdf | Preprint (acceso abierto) | 1,2 MB | Adobe PDF | Abrir Vista previa |
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