Adsorption of CO on various M@Pt core-shell nanoparticles: Surface-enhanced infrared absorption and DFT studies.
PBN-AR
Instytucja
Wydział Chemii (Uniwersytet Warszawski)
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
en
Czasopismo
VIBRATIONAL SPECTROSCOPY
ISSN
0924-2031
EISSN
Wydawca
ELSEVIER SCIENCE BV
DOI
URL
Rok publikacji
2014
Numer zeszytu
Strony od-do
11-18
Numer tomu
75
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
CO adsorption
Surface-enhanced infrared absorption
SEIRA
Direct ethanol fuel cells
Streszczenia
Język
en
Treść
Addition of some other metals to platinum causes significant increase of its catalytic activity towardsethanol electrochemical oxidation. This may be caused by different adsorption of CO molecules on thesurface of the catalyst, and hence different resistance of the M@Pt nanostructures to poisoning by CO. Inthis work we attempt to verify this hypothesis analyzing vibrational spectra of CO adsorbed on variousmetal nanoparticles. Au@Pt nanoparticles revealing significantly higher catalytic activity towards ethanoloxidation than one-element Pt nanoparticles have been synthesized. Surface-enhanced infrared absorp-tion (SEIRA) spectra of CO adsorbed on Au@Pt and Pt nanoparticles have been measured. Obtained spectrawere very similar, which suggests that the higher catalytic activity of Au@Pt nanoparticles is rather notcaused by different adsorption of CO molecules on Pt and Au@Pt nanoparticles. We suppose that bet-ter performance of core–shell M@Pt nanoparticles than one elements Pt nanoparticles towards ethanolelectrochemical oxidation can be explained as follows: core–shell nanoparticles are probably much moredefected than one-element nanoparticles, hence the M@Pt nanoparticles posses greater number of activesites (kinks, adatoms, and so on) for ethanol electrochemical oxidation. Analysis of the catalytic activ-ity and CO adsorption have been also carried out for other nanoparticles including: Sn@Pt, Pb@Pt, Pd,Au@Pd, Sn@Pd and Pb@Pd. Density functional theory (DFT) calculations of C O modes for CO adsorbedon tetrahedral Pt10or Pd10clusters with different metal–metal distance have been also performed.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
540797
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