title: Finding the Most Catalytically Active Platinum Clusters With Low Atomicity.
abstract: On a subnanometer scale, an only one-atom difference in a metal cluster may cause significant transitions in the catalytic activity due to the electronic and geometric configurations. We now report the atomicity-specific catalytic activity of platinum clusters with significantly small atomicity, especially below 20. The atomic coordination structure is completely different from that of the larger face-centered cubic (fcc) nanocrystals. Here, an electrochemical study on such small clusters, in which the atomicity ranged between 12 and 20, revealed Pt19 as the most catalytically active species. In combination with a theoretical study, a common structure that leads to a high catalytic performance is proposed.
authors.affiliation: Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama 226-8503 (Japan).
authors.forename: Takane
authors.initials: T
authors.lastname: Imaoka
authors.affiliation: Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama 226-8503 (Japan).
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Kitazawa
authors.affiliation: Graduate School of Arts and Sciences, International Christian University, Mitaka, Tokyo 181-8585 (Japan).
authors.forename: Wang-Jae
authors.initials: WJ
authors.lastname: Chun
authors.affiliation: Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama 226-8503 (Japan). yamamoto@res.titech.ac.jp.
authors.forename: Kimihisa
authors.initials: K
authors.lastname: Yamamoto
keywords: catalysts; cluster compounds; dendrimers; oxygen reduction reaction; platinum