Comparison of hydrogen atom adsorption on Pt clusters with that on Pt surfaces: A study from density-functional calculations

Density-functional calculations were performed to study hydrogen adsorption on Pt clusters and Pt surfaces. The calculations show that hydrogen atom adsorption energy on the clusters gradually decreases with increasing Pt cluster size. The adsorption on the facets of Pt147 clusters is similar to that on the corresponding Pt surfaces. On the other hand, Pt13, Pt38, and Pt55 clusters show quite different hydrogen adsorption behavior.