Oxide-based nanomaterials for fuel cell catalysis: the interplay between supported single Pt atoms and particles
Lykhach Y, Bruix A, Fabris S, Potin V, Matolinova I, Matolin V, Libuda J, Neyman KM (2017)
Publication Status: Published
Publication Type: Journal article, Review article
Publication year: 2017
Journal
Publisher: ROYAL SOC CHEMISTRY
Book Volume: 7
Pages Range: 4315-4345
Journal Issue: 19
DOI: 10.1039/c7cy00710h
Abstract
The concept of single atom catalysis offers maximum noble metal efficiency for the development of low-cost catalytic materials. Among possible applications are catalytic materials for proton exchange membrane fuel cells. In the present review, recent efforts towards the fabrication of single atom catalysts on nanostructured ceria and their reactivity are discussed in the prospect of their employment as anode catalysts. The remarkable performance and the durability of the ceria-based anode catalysts with ultra-low Pt loading result from the interplay between two states associated with supported atomically dispersed Pt and sub-nanometer Pt particles. The occurrence of these two states is a consequence of strong interactions between Pt and nanostructured ceria that yield atomically dispersed species under oxidizing conditions and sub-nanometer Pt particles under reducing conditions. The square-planar arrangement of four O atoms on {100} nanoterraces has been identified as the key structural element on the surface of the nanostructured ceria where Pt is anchored in the form of Pt2+ species. The conversion of Pt2+ species to sub-nanometer Pt particles is triggered by a redox process involving Ce3+ centers. The latter emerge due to either oxygen vacancies or adsorption of reducing agents. The unique properties of the sub-nanometer Pt particles arise from metal-support interactions involving charge transfer, structural flexibility, and spillover phenomena. The abundance of specific adsorption sites similar to those on {100} nanoterraces determines the ideal (maximum) Pt loading in Pt-CeOx films that still allows reversible switching between the atomically dispersed Pt and sub-nanometer particles yielding high activity and durability during fuel cell operation.
Authors with CRIS profile
Yaroslava Lykhach
Lehrstuhl für Physikalische Chemie II
Jörg Libuda
Professur für Physikalische Chemie
Additional Organisation(s)
Involved external institutions
Aarhus University
Denmark (DK)
Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy
Italy (IT)
Université Bourgogne Franche-Comté
France (FR)
Universitat de Barcelona (UB) / University of Barcelona
Spain (ES)
Univerzita Karlova v Praze / Charles University in Prague
Czech Republic (CZ)
Denmark (DK)
Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy
Italy (IT)
Université Bourgogne Franche-Comté
France (FR)
Universitat de Barcelona (UB) / University of Barcelona
Spain (ES)
Univerzita Karlova v Praze / Charles University in Prague
Czech Republic (CZ)
How to cite
APA:
Lykhach, Y., Bruix, A., Fabris, S., Potin, V., Matolinova, I., Matolin, V.,... Neyman, K.M. (2017). Oxide-based nanomaterials for fuel cell catalysis: the interplay between supported single Pt atoms and particles. Catalysis: Science and Technology, 7(19), 4315-4345. https://dx.doi.org/10.1039/c7cy00710h
MLA:
Lykhach, Yaroslava, et al. "Oxide-based nanomaterials for fuel cell catalysis: the interplay between supported single Pt atoms and particles." Catalysis: Science and Technology 7.19 (2017): 4315-4345.
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