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The Journal of Physical Chemistry A 2022, 126 Structures of Small Platinum Cluster Anions Ptn–: Experiment and Theory. Yohannes, Stephan Kohaut, Ivan Kondov, Manfred M. This article is cited by 144 publications. The present results suggest potential activity of the metastable clusters although they have been “missing” species in conventional statistical synthesis. Theoretical analyses based on density functional theory (DFT) also supported this idea. These analyses suggested that the Pt 12 has a deformed coordination, while the Pt 13 has a well-known icosahedral atomic coordination as part of the stable cluster series. ESI-TOF-mass and EXAFS analyses provided information about the structures. It was quite surprising that the Pt 12 cluster exhibited more than 2-fold catalytic activity compared with that of the Pt 13 cluster. The synthesis with an atomic-level precision was successfully achieved by using a dendrimer ligand as the macromolecular template strictly defining the number of metal atoms. We now report that the catalytic activity for the oxygen reduction reaction (ORR) significantly increased when only one atom was removed from a magic number cluster composed of 13-platinum atoms (Pt 13).
However, application on a subnanometer scale (0.5–2 nm) is difficult, a possible reason being that the activity no longer relies on the size but rather the geometric structure as a cluster (or superatomic) compound.
A relationship between the size of metal particles and their catalytic activity has been established over a nanometer scale (2–10 nm).
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