Maximum Noble‐Metal Efficiency in Catalytic Materials: Atomically Dispersed Surface Platinum1. Issue 39 (11th June 2014)

• Record Type: Journal Article
• Authors: Bruix, Albert; Lykhach, Yaroslava; Matolínová, Iva; Neitzel, Armin; Skála, Tomáš; Tsud, Nataliya; Vorokhta, Mykhailo; Stetsovych, Vitalii; Ševčíková, Klára; Mysliveček, Josef; Fiala, Roman; Václavů, Michal; Prince, Kevin C.; Bruyère, Stéphanie; Potin, Valérie; Illas, Francesc; Matolín, Vladimír; Libuda, Jörg; Neyman, Konstantin M.
• Is Part Of: Angewandte Chemie international edition. Volume 53:Issue 39(2014)
• Page Start: 10525
• Page End: 10530
• Publication Date: 2014-06-11
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201402342
• Languages: English
• ISSNs: 1433-7851

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Platinum is the most versatile element in catalysis, but it is rare and its high price limits large‐scale applications, for example in fuel‐cell technology. Still, conventional catalysts use only a small fraction of the Pt content, that is, those atoms located at the catalyst's surface. To maximize the noble‐metal efficiency, the precious metal should be atomically dispersed and exclusively located within the outermost surface layer of the material. Such atomically dispersed Pt surface species can indeed be prepared with exceptionally high stability. Using DFT calculations we identify a specific structural element, a ceria "nanopocket", which binds Pt²⁺ so strongly that it withstands sintering and bulk diffusion. On model catalysts we experimentally confirm the theoretically predicted stability, and on real Pt‐CeO₂ nanocomposites showing high Pt efficiency in fuel‐cell catalysis we also identify these anchoring sites.</p> </abstract>