Artículo
Oxygen Reduction in Alkaline Media—a Discussion
Ignaczak, Anna; Nazmutdinov, Renat; Goduljan, Aleksej; de Campos Pinto, Leandro Moreira; Juarez, Fernanda; Quaino, Paola Monica
; Belletti, Gustavo Daniel
; Santos, Elizabeth del Carmen
; Schmickler, Wolfgang
Fecha de publicación:
11/2017
Editorial:
Springer New York LLC
Revista:
Electrocatalysis
ISSN:
1868-5994
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We propose a complete reaction sequence for oxygen reduction in alkaline solutions, in which the first two steps occur in the outer sphere mode. The oxygen-oxygen bond is broken in the third step, which involves adsorption of OH, which is desorbed in the last step. We have investigated the sequence by quantum-chemical methods and determined the energies of activation. Whether the reaction follows a four- or a two-electron mechanism, depends critically on the energy of adsorption of OH. We surmise that our mechanism holds on all electrodes which interact weakly with oxygen, in particular on gold, silver, and graphite. We explain, why Au(100) is a better catalyst than Au(111), why at high overpotentials the reaction on Au(100) reverts to a two-electron mechanism, and why this does not happen on silver. [Figure not available: see fulltext.]
Palabras clave:
Alkaline Fuel Cells
,
Dft
,
Electron Transfer
,
Oxygen Reduction
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - SANTA FE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - SANTA FE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - SANTA FE
Citación
Ignaczak, Anna; Nazmutdinov, Renat; Goduljan, Aleksej; de Campos Pinto, Leandro Moreira; Juarez, Fernanda; et al.; Oxygen Reduction in Alkaline Media—a Discussion; Springer New York LLC; Electrocatalysis; 8; 6; 11-2017; 554-564
Compartir
Altmétricas