Impact of Rh–CeO interaction on CO oxidation mechanisms

Ševčíková, Klára; Kolářová, Tatiana; Škála, Tomáš; Tsud, Nataliya; Václavů, Michal; Lykhach, Yaroslava; Matolín, Vladimı́r; Nehasil, V.

doi:10.1016/j.apsusc.2015.01.197

Cited by 27 publications

(6 citation statements)

References 52 publications

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“…In consequence, the net charge transfer is a function of the degree of reduction of the ceria support. 35,139,140 Depending on the specific system, metal particles can bear a positive charge on highly oxidized ceria supported and a negative charge on highly reduced supports.…”

Section: Redox Coupling With the Reducing Agentmentioning

confidence: 99%

Oxide-based nanomaterials for fuel cell catalysis: the interplay between supported single Pt atoms and particles

Lykhach

Bruix

Fabris

et al. 2017

Catal. Sci. Technol.

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The concept of single atom catalysis offers maximum noble metal efficiency for the development of lowcost 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 subnanometer 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 Pt 2+ species. The conversion of Pt 2+ species to subnanometer Pt particles is triggered by a redox process involving Ce 3+ 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-CeO x films that still allows reversible switching between the atomically dispersed Pt and sub-nanometer particles yielding high activity and durability during fuel cell operation.

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Section: Redox Coupling With the Reducing Agentmentioning

confidence: 99%

Oxide-based nanomaterials for fuel cell catalysis: the interplay between supported single Pt atoms and particles

Lykhach

Bruix

Fabris

et al. 2017

Catal. Sci. Technol.

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“…Structure-activity relationships of metal doped nano-Au catalysts were then elucidated in Reddy’s work 7 . CO oxidation mechanisms were studied and metal-support interaction between nanoparticles and the supports partly accounted for the improvement of catalytic activities 8 9 10 . However, those noble metal based catalysts are still expensive, scarce and sensitive to impurities for deactivation 11 , which hinder their widespread applications.…”

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confidence: 99%

Transition-Metal Doped Ceria Microspheres with Nanoporous Structures for CO Oxidation

Zhou

Yao

et al. 2016

Sci Rep

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Catalytic oxidation of carbon monoxide (CO) is of great importance in many different fields of industry. Until now it still remains challenging to use non-noble metal based catalysts to oxidize CO at low temperature. Herein, we report a new class of nanoporous, uniform, and transition metal-doped cerium (IV) oxide (ceria, CeO2) microsphere for CO oxidation catalysis. The porous and uniform microsphere is generated by sacrificed polymer template. Transition-metals, like Cu, Co, Ni, Mn and Fe, were doped into CeO2 microspheres. The combination of hierarchical structure and metal doping afford superior catalytic activities of the doped ceria microspheres, which could pave a new way to advanced non-precious metal based catalysts for CO oxidation.

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“…It is well known that dopants in CeO 2 lead to higher oxygen storage capacity. 10,16,45,46 A recent study by Boronin et al 16 showed that with increasing Pt loading in CeO 2 , the onset of the CO 2 evolution shis dramatically to lower temperatures. In particular, the authors reported an onset of CO 2 formation in the absence of an external oxygen supply at 270 K (−3 °C) for 20 wt% Pt-CeO 2 .…”

Section: Involvement Of Ceo 2 In Co Oxidation Reactionmentioning

confidence: 99%

“…[2][3][4][5][6][7] Also, from a fundamental point of view, CO oxidation is of great interest as it is a prototype reaction for determining the activity of oxidation catalysts. 8 Multicomponent systems which contain platinum-group metals as the active phase and reducible oxides as supports show high activity for LTO of CO. [9][10][11][12][13][14] In these materials, metallic Pt is found in the form of nanoparticles (Pt 0 NPs) or clusters, oxidized NPs or clusters, and atomically dispersed species. It is known that the Pt undergoes dynamic structural transformations between these forms depending on the reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Probing the redox capacity of Pt–CeO₂ model catalyst for low-temperature CO oxidation

et al. 2023

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Impact of Rh–CeO interaction on CO oxidation mechanisms

Cited by 27 publications

References 52 publications

Oxide-based nanomaterials for fuel cell catalysis: the interplay between supported single Pt atoms and particles

Oxide-based nanomaterials for fuel cell catalysis: the interplay between supported single Pt atoms and particles

Transition-Metal Doped Ceria Microspheres with Nanoporous Structures for CO Oxidation

Probing the redox capacity of Pt–CeO₂ model catalyst for low-temperature CO oxidation

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Impact of Rh–CeO interaction on CO oxidation mechanisms

Cited by 27 publications

References 52 publications

Oxide-based nanomaterials for fuel cell catalysis: the interplay between supported single Pt atoms and particles

Oxide-based nanomaterials for fuel cell catalysis: the interplay between supported single Pt atoms and particles

Transition-Metal Doped Ceria Microspheres with Nanoporous Structures for CO Oxidation

Probing the redox capacity of Pt–CeO2 model catalyst for low-temperature CO oxidation

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Probing the redox capacity of Pt–CeO₂ model catalyst for low-temperature CO oxidation