Origin of the Deactivation of Spinel CuxCo3−xO4/Ti Anodes Prepared by Thermal Decomposition
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Título: | Origin of the Deactivation of Spinel CuxCo3−xO4/Ti Anodes Prepared by Thermal Decomposition |
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Autor/es: | Berenguer Betrián, Raúl | La Rosa-Toro, Adolfo | Quijada Tomás, César | Morallon, Emilia |
Grupo/s de investigación o GITE: | Electrocatálisis y Electroquímica de Polímeros |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales |
Palabras clave: | Coating materials | Electrodes | Layers | Oxides | Spinel |
Fecha de publicación: | 4-oct-2008 |
Editor: | American Chemical Society |
Cita bibliográfica: | The Journal of Physical Chemistry C. 2008, 112(43): 16945-16952. https://doi.org/10.1021/jp804403x |
Resumen: | Thin films of spinel CuxCo3−xO4 with nominal composition 0.0 ≤ x ≤ 1.0 were supported on Ti by the thermal decomposition method. The resulting electrodes were deactivated by prolonged anodic polarization in 1 M NaOH. The ensuing changes in the surface morphology, chemical composition, and crystalline properties were studied by means of scanning electron microscopy, energy dispersive X-ray microanalysis, X-ray diffraction, and X-ray photoelectron spectroscopy. The electrochemical response was inspected by cyclic voltammetry. Surface imaging shows grain sharpening and extensive loss of the oxide coating, which becomes more marked with the increasing proportion of lattice Cu2+ ions. Diffraction patterns show the rise in the relative intensity of the underlying Ti reflections and the loss of the cobalt spinel diffraction peaks. Lattice Cu2+ ions dissolve preferentially and are virtually absent in deactivated mixed oxide anodes. Photoelectron spectroscopy indicates the presence of a highly hydrated Co(II)-containing surface layer. The reduction of the spinel oxide surface layer into an inactive hydrated CoO or a Co(OH)2 layer after oxidative electrolysis is discussed. |
Patrocinador/es: | Funds from the Generalitat Valenciana (Projects GV05/136 and RED ARVIV/2007/076) and Ministerio de Educación y Ciencia-FEDER (Project MAT2007-60621) are gratefully acknowledged. |
URI: | http://hdl.handle.net/10045/140441 |
ISSN: | 1932-7447 (Print) | 1932-7455 (Online) |
DOI: | 10.1021/jp804403x |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2008 American Chemical Society |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1021/jp804403x |
Aparece en las colecciones: | INV - GEPE - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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Berenguer_etal_2008_JPhysChemC_final.pdf | Versión final (acceso restringido) | 1,8 MB | Adobe PDF | Abrir Solicitar una copia |
Berenguer_etal_2008_JPhysChemC_revised.pdf | Versión revisada (acceso abierto) | 1,89 MB | Adobe PDF | Abrir Vista previa |
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