The study of small clusters, particles composed of only a few atoms, is not only
interesting because of their intrinsic physical properties, strongly influenced by
quantum confinement and subjected to significant size-to-size variations, but also
because clusters are ideal model systems for the investigation of complex chemical
reactions. In this article, we describe how doped platinum clusters composed
of less than 20 atoms can be used to address questions about physical and chemical
processes taking place in proton-exchange membrane fuel cells. Combining
mass spectrometric experiments with theoretical calculations, the particular role of
dopant-induced electronic charge transfers in the interaction of platinum nanoparticles
with carbon monoxide molecules is investigated.
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