Reactivity of Graphene-Supported Pt Nanocluster Arrays

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Gotterbarm K, Späth F, Bauer U, Bronnbauer C, Steinrück HP, Papp C
Zeitschrift: ACS Catalysis
Verlag: American Chemical Society
Jahr der Veröffentlichung: 2015
Band: 5
Heftnummer: 4
Seitenbereich: 2397--2403
ISSN: 2155-5435


Abstract


Nanocluster arrays on graphene (Gr) are intriguing model systems for catalysis. We studied the adsorption and oxidation of CO on Pt/Gr/Rh(111) with synchrotron-based high-resolution X-ray photoelectron spectroscopy. On the nanoclusters, CO is found to adsorb at three different sites: namely, on-top, bridge, and step. The C 1s spectra exhibit remarkable similarities to those on the stepped Pt(355) surface. Similar to the case for stepped Pt surfaces, a clear preference for the adsorption on the step sites is found, while the preference for the adsorption on the on-top site over the bridge site on the terraces is much less pronounced in comparison to that on Pt single crystals. Temperature-programmed X-ray photoelectron spectroscopy revealed an enhanced binding energy for the cluster step sites, similar to the situation on stepped Pt surfaces. The oxidation of CO on graphene-supported Pt nanoclusters follows a pseudo-first-order rate law. Applying an Arrhenius analysis, we found an activation energy of 13 ± 4 kJ/mol, which is much smaller than that on Pt(111), due to the more reactive step and kink sites on the nanoclusters.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Bauer, Udo Dr.
Lehrstuhl für Physikalische Chemie II
Bronnbauer, Carina
Lehrstuhl für Physikalische Chemie II
Gotterbarm, Karin
Lehrstuhl für Physikalische Chemie II
Papp, Christian PD Dr.
Lehrstuhl für Physikalische Chemie II
Späth, Florian
Lehrstuhl für Physikalische Chemie II
Steinrück, Hans-Peter Prof. Dr.
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:
Gotterbarm, K., Späth, F., Bauer, U., Bronnbauer, C., Steinrück, H.-P., & Papp, C. (2015). Reactivity of Graphene-Supported Pt Nanocluster Arrays. ACS Catalysis, 5(4), 2397--2403. https://dx.doi.org/10.1021/acscatal.5b00245

MLA:
Gotterbarm, Karin, et al. "Reactivity of Graphene-Supported Pt Nanocluster Arrays." ACS Catalysis 5.4 (2015): 2397--2403.

BibTeX: 

Zuletzt aktualisiert 2019-24-04 um 08:32