Electrochemically enhanced metal-support interaction of highly dispersed Ru nanoparticles with a CeO2 support

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DOIResolve DOI: http://doi.org/10.1016/j.jcat.2014.07.003
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TypeArticle
Journal titleJournal of Catalysis
ISSN0021-9517
Volume318
Pages8594; # of pages: 10
SubjectCatalyst activity; Catalytic oxidation; Cerium compounds; Ethylene; Metal nanoparticles; Metals; Oxidation; Polarization; Reduction; Yttria stabilized zirconia; Catalytic performance; Electrochemical promotion; Ethylene oxidation; Faradaic efficiencies; Metal-support interactions; Mixed ionic-electronic conductors; Negative polarization; Ru nanoparticles; Ruthenium
AbstractSmall particle size (1.1 nm) Ru nanoparticles were supported on a mixed ionic-electronic conductor, CeO2, with a low metal loading (1 wt%), interfaced with a YSZ electrolyte. A pronounced enhancement (up to about 2.5 times) of the catalytic rate for the complete oxidation of ethylene was observed for negative polarization. The opposite effect was observed for positive polarization. Apparent Faradaic efficiencies up to 96 were determined, indicating a non-Faradaic effect. The modification of the cerium oxidation state (i.e., reduction from Ce4+ to Ce3+) is proposed to enhance the catalytic performance of the Ru nanoparticles. XPS analysis was performed to confirm this reduction of ceria. The enhancement of catalytic activity is attributed to the presence of more oxygen vacancies in the ceria interlayer causing a stronger metal-support interaction. Results demonstrate the feasibility of in-situ modification of the metal support-interaction between Ru nanoparticles and CeO2 catalytic support by a small current (-2 μA) application.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNational Research Council Canada; Energy, Mining and Environment
Peer reviewedYes
NPARC number21272803
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Record identifier784bb68e-bd4a-4d5e-849f-bdfa6ed166e3
Record created2014-12-03
Record modified2016-05-09
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