Probing Single Pt Atoms in Complex Intermetallic Al13Fe4

Tsunetomo Yamada; Takayuki Kojima; Eiji Abe; Satoshi Kameoka; Yumi Murakami; Peter Gille; An Pang Tsai

doi:10.1021/jacs.7b13658

Probing Single Pt Atoms in Complex Intermetallic Al₁₃Fe₄

J Am Chem Soc. 2018 Mar 21;140(11):3838-3841. doi: 10.1021/jacs.7b13658. Epub 2018 Mar 6.

Authors

Tsunetomo Yamada¹, Takayuki Kojima^{1

2}, Eiji Abe³, Satoshi Kameoka¹, Yumi Murakami¹, Peter Gille⁴, An Pang Tsai¹

Affiliations

¹ Institute of Multidisciplinary Research for Advanced Materials (IMRAM) , Tohoku University , 2-1-1 Katahira, Aoba-ku , Sendai 980-8577 , Japan.
² Frontier Research Institute for Interdisciplinary Sciences , Tohoku University , Aramaki aza Aoba 6-3, Aoba-ku , Sendai 980-8578 , Japan.
³ Department of Materials Science and Engineering , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-8656 , Japan.
⁴ Department of Earth and Environmental Sciences , Ludwig Maximilians University Munich , Theresienstr. 41 , Munich 80333 , Germany.

PMID: 29510035
DOI: 10.1021/jacs.7b13658

Abstract

The atomic structure of a 0.2 atom % Pt-doped complex metallic alloy, monoclinic Al₁₃Fe₄, was investigated using a single crystal prepared by the Czochralski method. High-angle annular dark-field scanning transmission electron microscopy showed that the Pt atoms were dispersed as single atoms and substituted at Fe sites in Al₁₃Fe₄. Single-crystal X-ray structural analysis revealed that the Pt atoms preferentially substitute at Fe(1). Unlike those that have been reported, Pt single atoms in the surface layers showed lower activity and selectivity than those of Al₂Pt and bulk Pt for propyne hydrogenation, indicating that the active state of a given single-atom Pt site is strongly dominated by the bonding to surrounding Al atoms.

Publication types

Research Support, Non-U.S. Gov't