Creating single-atom Pt-ceria catalysts by surface step decoration

Filip Dvořák, Matteo Farnesi Camellone, Andrii Tovt, Nguyen-Dung Tran, Fabio R. Negreiros, Mykhailo Vorokhta, Tomáš Skála, Iva Matolínová, Josef Mysliveček (), Vladimír Matolín and Stefano Fabris ()
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Filip Dvořák: Charles University in Prague, Faculty of Mathematics and Physics
Matteo Farnesi Camellone: CNR-IOM DEMOCRITOS, Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche
Andrii Tovt: Charles University in Prague, Faculty of Mathematics and Physics
Nguyen-Dung Tran: CNR-IOM DEMOCRITOS, Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche
Fabio R. Negreiros: CNR-IOM DEMOCRITOS, Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche
Mykhailo Vorokhta: Charles University in Prague, Faculty of Mathematics and Physics
Tomáš Skála: Charles University in Prague, Faculty of Mathematics and Physics
Iva Matolínová: Charles University in Prague, Faculty of Mathematics and Physics
Josef Mysliveček: Charles University in Prague, Faculty of Mathematics and Physics
Vladimír Matolín: Charles University in Prague, Faculty of Mathematics and Physics
Stefano Fabris: CNR-IOM DEMOCRITOS, Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Single-atom catalysts maximize the utilization of supported precious metals by exposing every single metal atom to reactants. To avoid sintering and deactivation at realistic reaction conditions, single metal atoms are stabilized by specific adsorption sites on catalyst substrates. Here we show by combining photoelectron spectroscopy, scanning tunnelling microscopy and density functional theory calculations that Pt single atoms on ceria are stabilized by the most ubiquitous defects on solid surfaces—monoatomic step edges. Pt segregation at steps leads to stable dispersions of single Pt2+ ions in planar PtO4 moieties incorporating excess O atoms and contributing to oxygen storage capacity of ceria. We experimentally control the step density on our samples, to maximize the coverage of monodispersed Pt2+ and demonstrate that step engineering and step decoration represent effective strategies for understanding and design of new single-atom catalysts.

Date: 2016
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DOI: 10.1038/ncomms10801

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