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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10371524" target="_blank" >RIV/00216208:11320/17:10371524 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1039/c7cy00710h" target="_blank" >http://dx.doi.org/10.1039/c7cy00710h</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c7cy00710h" target="_blank" >10.1039/c7cy00710h</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Catalysis: Science and Technology

ISSN

2044-4753

e-ISSN

—

Volume of the periodical

7

Issue of the periodical within the volume

19

Country of publishing house

GB - UNITED KINGDOM

Number of pages

31

Pages from-to

4315-4345

UT code for WoS article

000413190800008

EID of the result in the Scopus database

2-s2.0-85027682299