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dc.contributor.author
Luque, Gisela Carina
dc.contributor.author
Fernandez, Jose Luis
dc.date.available
2020-02-02T14:17:44Z
dc.date.issued
2012-04
dc.identifier.citation
Luque, Gisela Carina; Fernandez, Jose Luis; Electrocatalysis of oxygen reduction at electrodeposited molybdenum phosphate-based films; Elsevier Science; Journal of Power Sources; 203; 4-2012; 57-64
dc.identifier.issn
0378-7753
dc.identifier.uri
http://hdl.handle.net/11336/96473
dc.description.abstract
This work reports an electrode material containing molybdenum phosphate that shows a very interesting behavior as an electrocatalyst for the reduction of oxygen to water (ORR) in acid medium. The material is electrodeposited on a glassy carbon electrode from a solution of Mo(VI) and Co(II) in phosphate buffer at pH = 7. Cobalt is required to obtain a compact and uniform film. It is a non-crystalline solid conformed by metal oxide and phosphate groups that, according to XPS analysis, contains mostly Mo(VI) and a small fraction of Mo(V). Even though most of the Co-containing phase dissolves in acid, the film keeps its integrity and shows stable ORR activity in acid at very low overpotentials (from -0.3 V). The observed current density reaches a very small limiting value (∼2 μA cm -2) that is independent of the mass-transport conditions and could be associated to the small fraction of Mo(V) centers that function as ORR active sites. Although the film is thermally stable up to temperatures of 400 °C, by heating the material at temperatures above 100 °C it looses its unusual ORR activity due to the complete oxidation of Mo(V) to Mo(VI).
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
OXYGEN REDUCTION
dc.subject
MOLYBDENUM PHOSPHATE
dc.subject
ELECTROCATALYSIS
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Pt-FREE CATHODES
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica
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Ciencias Químicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Electrocatalysis of oxygen reduction at electrodeposited molybdenum phosphate-based films
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-01-29T19:19:35Z
dc.journal.volume
203
dc.journal.pagination
57-64
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Luque, Gisela Carina. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Programa de Electroquímica Aplicada e Ingeniería Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina
dc.description.fil
Fil: Fernandez, Jose Luis. Universidad Nacional del Litoral. Facultad de Ingeniería Química. Programa de Electroquímica Aplicada e Ingeniería Electroquímica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina
dc.journal.title
Journal of Power Sources
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1016/j.jpowsour.2011.11.083
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