ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Pt nano-particles are supported on carbon materials at the electrode catalysts of protonexchangemenbrane fuel cells. Pt nano-particles are desirable to be strongly adsorbed on carbonmaterials for high dispersion, although strong Pt-C interactions may affect the catalytic activity ofsmall clusters. Thus we have examined H-atom absorption on Pt clusters supported or unsupportedon graphene sheets, using first-principles calculations. For Pt-atom/graphene systems, a H atom ismore weakly adsorbed than for a free Pt atom, and the H-Pt interaction becomes weaker if theinteraction between a Pt atom and graphene becomes stronger. For the Ptn-cluster/graphene systems(n=2-4), the H-Pt interactions are also substantially changed from those for free Pt clusters. In the Ptclusters on graphene, the Pt-Pt distances are substantially changed associated with the electronicstructurechanges by the Pt-C interactions. These structural and electronic changes in the Pt clustersas well as the presence of graphene itself seem to cause the changes in the absorption energies andpreferential sites of H-atom absorption
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.139.41.pdf
