Journal Article

PUBDB-2024-06483

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Probing active sites on Pd/Pt alloy nanoparticles by CO adsorption

Dolling, S. (Corresponding author)DESY* ; chen, j. ; Schober, J.-C.DESY* ; Creutzburg, M.DESY* ; Jeromin, A.DESY* ; Vonk, V.DESY* ; Sharapa, D. I. ; Keller, T. F.DESY* ; Plessow, P. N. ; Noei, H. (Corresponding author)DESY* ; Stierle, A. (Corresponding author)DESY*

2024
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acsnano.4c08291  doi:10.3204/PUBDB-2024-06483

Abstract: We studied the adsorption of CO on Pd/Pt nanoparticles (NPs) with varying com-positions using polarization-dependent Fourier transform infrared reflection absorptionspectroscopy (FT-IRRAS) and theoretical calculations (DFT). We prepared PtPd al-loy nanoparticles via physical vapor co-deposition on α-Al$_2$O$_3$(0001) supports. Ourmorphological and structural characterization by scanning electron microscopy andgrazing incidence x-ray diffraction revealed well-defined, epitaxial nanoparticles. Weused CO as a probe molecule to identify the particles’ surface active sites. Polarization-dependent FT-IRRAS enabled us to distinguish CO adsorption on top and side facets ofthe NPs. The role of the Pd/Pt alloy ratio on CO adsorption was investigated by com-paring the experimental CO stretching band frequency for different alloy arrangementsto the results for pure Pd and Pt nanoparticles. Moreover, we studied the influence ofhydrogen adsorption on the NP surface composition. We determined the dependenceof the IR bands on the local atomic arrangement via DFT calculations, revealing thatboth bulk alloy composition and neighboring atoms influence the wavenumber of thebands.

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Contributing Institute(s):

1. Nanolab (FS-NL)
2. externe Institute im Bereich Photon Science (KIT)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. DFG project G:(GEPRIS)426888090 - SFB 1441: Verfolgung der aktiven Zentren in heterogenen Katalysatoren für die Emissionskontrolle (TrackAct) (426888090) (426888090)

Experiment(s):

1. DESY NanoLab: Surface Spectroscopy
2. DESY NanoLab: Sample Preparation
3. DESY NanoLab: X-Ray Diffraction
4. DESY NanoLab: Microscopy

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 15 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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