Electrocatalysis of oxygen reduction at well-defined iron oxide electrodes

A comparative study of O2 reduction on well defined iron oxides Fe3O4 and γ-FeOOH is presented. The Fe(III)/Fe(II) surface stoichiometry strongly depends on potential and determines the electronic conductivity and electron transfer rate to soluble redox species. A common feature of O2 reduction on b...

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Detalles Bibliográficos
Autores principales: Vago, E.R., Calvo, E.J., Stratmann, M.
Formato: JOUR
Materias:
electrocatalysis
iron oxide
oxygen
peroxide
Catalysis
Composition
Electric conductivity
Electrochemistry
Electrodes
Electrolytes
Interfaces (materials)
Iron oxides
Oxygen
Peroxides
pH
Structure (composition)
Cyclic voltammetry
Electrocatalysis
Electronic conductivity
Rotating disc electrodes
Soluble redox species
Surface stoichiometry
X ray photoelectron spectroscopy
Reduction
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00134686_v39_n11-12_p1655_Vago
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:A comparative study of O2 reduction on well defined iron oxides Fe3O4 and γ-FeOOH is presented. The Fe(III)/Fe(II) surface stoichiometry strongly depends on potential and determines the electronic conductivity and electron transfer rate to soluble redox species. A common feature of O2 reduction on both oxides is the occurrence of Fe2+ surface sites simultaneous to O2 reduction, which is necessary for the specific interaction between Fe(II) and O2. The electrocatalytic differences for γ-FeOOH and Fe3O4 are related to differences in oxide structure and different structure of the oxide-electrolyte interface. © 1994.

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