Artículo
Surface diffusion of poisoning species during CO and formic acid oxidation on PtAu surface. The key role of the active site
Minudri, Daniela
; Tesio, Alvaro Yamil
; Fungo, Florencia; Palacios, Rodrigo Emiliano
; Cappellari, Paula Sofía
; Pastor, Elena; Planes, Gabriel Angel
Fecha de publicación:
31/01/2021
Editorial:
Elsevier Science
Revista:
Journal of Power Sources
ISSN:
0378-7753
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
A comparative study of the Pt and Pt/Au surface towards CO and formic acid oxidation was performed by conventional electrochemical techniques used in combination with an electrochemical flow cell (four-electrode configuration) and in-situ Fourier Transform Infrared Spectroscopy. With this purpose, a polycrystalline Pt electrode was modified by spontaneous deposition of gold atoms, achieving a gold surface coverage (θ) in the range of 0 ≤ θ ≤ 0.47. Formic acid and carbon monoxide electrooxidation on polycrystalline Pt and Au-modified Pt surfaces were studied by cyclic voltammetry, linear sweep voltammetry, chronoamperometry and in-situ FTIR techniques. The electrochemical and in-situ FTIR evidence collected for CO and FA oxidation on Pt/Au support the idea of a strongly modified Pt surface. At the Pt/Au electrode, Au operates as a barrier between surface domains, and the main observable result is the uncoupling of the catalytic activity. The free (fast) surface diffusion of reactants at a low potential, which leads to characterize Ptpc as a “homogeneous surface” towards CO and FA oxidation, is not possible when Au is present.
Palabras clave:
ELECTROLESS
,
FORMIC ACID
,
IN-SITU FTIR
,
PT/AU
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos (CIDMEJu)
Articulos de CENTRO DE INVESTIGACION Y DESARROLLO EN MATERIALES AVANZADOS Y ALMACENAMIENTO DE ENERGIA DE JUJUY
Articulos de CENTRO DE INVESTIGACION Y DESARROLLO EN MATERIALES AVANZADOS Y ALMACENAMIENTO DE ENERGIA DE JUJUY
Articulos (IITEMA)
Articulos de INSTITUTO DE INVESTIGACIONES EN TECNOLOGIAS ENERGETICAS Y MATERIALES AVANZADOS
Articulos de INSTITUTO DE INVESTIGACIONES EN TECNOLOGIAS ENERGETICAS Y MATERIALES AVANZADOS
Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos(CCT - SALTA-JUJUY)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - SALTA-JUJUY
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - SALTA-JUJUY
Citación
Minudri, Daniela; Tesio, Alvaro Yamil; Fungo, Florencia; Palacios, Rodrigo Emiliano; Cappellari, Paula Sofía; et al.; Surface diffusion of poisoning species during CO and formic acid oxidation on PtAu surface. The key role of the active site; Elsevier Science; Journal of Power Sources; 483; 31-1-2021; 1-10
Compartir
Altmétricas