Pd model catalysts on clean and modified HOPG: Growth, adsorption properties, and stability

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Kettner M, Stumm C, Schwarz M, Schuschke C, Libuda J
Zeitschrift: Surface Science
Verlag: ELSEVIER SCIENCE BV
Jahr der Veröffentlichung: 2019
Band: 679
Seitenbereich: 64-73
ISSN: 0039-6028


Abstract

Carbon is a common support material for noble metal nanoparticles in heterogeneous catalysis and electro-catalysis. Very few surface-science-based model studies have been performed, however, with noble metal nanoparticles on carbon supports. In this work, we present the first model study on carbon-supported noble metal nanoparticles using infrared reflection absorption spectroscopy (IRAS). The model catalyst is prepared on highly oriented pyrolytic graphite (HOPG) by physical vapor deposition (PVD) of Pd metal. We characterize the particle growth and morphology by scanning tunneling microscopy (STM) and atomic force microscopy (AFM) and probe the adsorption properties by IRAS of adsorbed CO.PVD of Pd on clean HOPG leads to the formation of very large, weakly interacting particles. In order to increase the nucleation density upon Pd deposition, the HOPG surface was modified by Ar+ and O+ bombardment. The defect structures formed were characterized by STM and by IRAS during the ion bombardment. On the pretreated HOPG, Pd nucleates homogeneously and stable Pd nanoparticles (NPs) are formed. We investigated the adsorption properties of the Pd NPs as a function of the particle size and their thermal stability upon annealing. It is shown that carbon species migrate from the HOPG modified by ion bombardment onto the Pd NPs leading to modification of the CO adsorption properties.The work shows that Pd/HOPG is a very well-suited model system for in-situ adsorption and reaction studies by IRAS, in spite of the non-metallicity of the support.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Kettner, Miroslav, Ph.D.
Lehrstuhl für Katalytische Grenzflächenforschung
Libuda, Jörg Prof. Dr.
Professur für Physikalische Chemie
Schuschke, Christian
Lehrstuhl für Physikalische Chemie II
Schwarz, Matthias
Lehrstuhl für Physikalische Chemie II
Stumm, Corinna
Lehrstuhl für Physikalische Chemie II


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Forschungsbereiche

D Catalytic Materials
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Kettner, M., Stumm, C., Schwarz, M., Schuschke, C., & Libuda, J. (2019). Pd model catalysts on clean and modified HOPG: Growth, adsorption properties, and stability. Surface Science, 679, 64-73. https://dx.doi.org/10.1016/j.susc.2018.08.022

MLA:
Kettner, Miroslav, et al. "Pd model catalysts on clean and modified HOPG: Growth, adsorption properties, and stability." Surface Science 679 (2019): 64-73.

BibTeX: 

Zuletzt aktualisiert 2019-22-07 um 07:36