Reactivity of Graphene-Supported Pt Nanocluster Arrays

Gotterbarm K, Späth F, Bauer U, Bronnbauer C, Steinrück HP, Papp C (2015)

Publication Type: Journal article

Publication year: 2015


Publisher: American Chemical Society

Book Volume: 5

Pages Range: 2397--2403

Volume: 5

Issue: 4

Journal Issue: 4

DOI: 10.1021/acscatal.5b00245


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.

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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.


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

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