Skip navigation
Por favor, use este identificador para citar o enlazar este ítem: http://uvadoc.uva.es/handle/10324/29144
Título: Steric and chemical effects on the hydrogen adsorption and dissociation on free and graphene–supported palladium clusters
Autor: Granja del Río, Alejandra
Alonso Martín, Julio Alfonso
López Santodomingo, María José
Año del Documento: 2017
Editorial: Elsevier
Documento Fuente: Computational and Theoretical Chemistry 1107, 23-29 (2017)
Resumen: Palladium doping enhances the hydrogen storage capacity of nanoporous carbons. The purpose of this work is to asses the effect of the carbonaceous support on the adsorption of hydrogen on Pd clusters. Hydrogen adsorbs on Pd clusters following two channels: molecular adsorption and dissociative chemisorption. These two adsorption channels are investigated on free Pd clusters and Pd clusters supported on pristine and defective (with vacancies) graphene using the Density Functional Formalism. Pd6 is taken as case study. Free Pd6 can adsorb twelve hydrogen molecules in the molecular form, a number higher than the nine and eight molecules that can be adsorbed on the cluster supported on pristine graphene and on a graphene vacancy, respectively. However the most stable adsorption channel is, in all cases, the dissociative chemisorption of hydrogen. As the cluster is being loaded with hydrogen, there is a competition between the two adsorption channels. Pd6 supported on a graphene vacancy is able to dissociate three hydrogen molecules, whereas the free cluster can dissociate up to seven molecules. In both cases, six additional molecules can be adsorbed in the molecular form. The higher saturation limit obtained for the free clusters is explained in terms of the steric and chemical effects of the supporting layer. These effects are of primarily importance to asses the role of the Pd dopant on the adsorption and storage of hydrogen on nanoporous carbons.
Palabras Clave: hydrogen storage
graphene
palladium clusters
Revisión por Pares: SI
DOI: http://dx.doi.org/10.1016/j.comptc.2016.11.029
Patrocinador: This work was supported by MICINN of Spain (Grant MAT2014- 54378-R)
and Junta de Castilla y León (Grant VA050U14).
Idioma: eng
URI: http://uvadoc.uva.es/handle/10324/29144
Derechos: info:eu-repo/semantics/openAccess
Aparece en las colecciones:DEP33 - Artículos de revista

Ficheros en este ítem:
Fichero Descripción TamañoFormato 
postprintH2saturationPd6.pdf1,07 MBAdobe PDFThumbnail
Visualizar/Abrir

Este ítem está sujeto a una licencia Creative Commons Licencia Creative Commons Creative Commons

Comentarios
Universidad de Valladolid
Powered by MIT's. DSpace software, Version 5.5
UVa-STIC