Artículo
Volcano plots in hydrogen electrocatalysis: uses and abuses
Fecha de publicación:
06/2014
Editorial:
Beilstein-Institut
Revista:
Beilstein Journal of Nanotechnology
ISSN:
2190-4286
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Sabatier’s principle suggests, that for hydrogen evolution a plot of the rate constant versus the hydrogen adsorption energy should result in a volcano, and several such plots have been presented in the literature. A thorough examination of the data shows, that there is no volcano once the oxide-covered metals are left out. We examine the factors that govern the reaction rate in the light of our own theory and conclude, that Sabatier’s principle is only one of several factors that determine the rate. With the exception of nickel and cobalt, the reaction rate does not decrease for highly exothermic hydrogen adsorption as predicted, because the reaction passes through more suitable intermediate states. The case of nickel is given special attention; since it is a 3d metal, its orbitals are compact and the overlap with hydrogen is too low to make it a good catalyst.
Palabras clave:
Electrocatalysis
,
Hydrogen Evolution
,
Sabatier'S Principle
,
Volcano Curve
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
Articulos(IFEG)
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Citación
Schmickler, Wolfgang; Santos, Elizabeth del Carmen; Juarez, Maria Fernanda; Quaino, Paola Monica; Volcano plots in hydrogen electrocatalysis: uses and abuses; Beilstein-Institut; Beilstein Journal of Nanotechnology; 5; 6-2014; 846-854
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