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

Pt single atoms on ceria stabilized by the monoatomic step edges were studied by photoemission spectroscopy, scanning tunnelling microscopy and DFT calculations, aiming to new single-atom catalysts.

Dvořák et al., Nature Communications 7 (2016) 10801

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.

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Creating single-atom Pt-ceria catalysts by surface step decoration
F. Dvořák, M. Farnesi Camellone, A. Tovt, N.-D. Tran, F.R. Negreiros, M. Vorokhta, T. Skála, I. Matolínová, J. Mysliveček, V. Matolín, S. Fabris
Nature Communications 7 (2016) 10801

DOI:  10.1038/ncomms10801
Last Updated on Saturday, 23 April 2016 16:26