| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Fiordaliso, Elisabetta Maria
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2022Doping Profiles in Ultrathin Vertical VLS-Grown InAs Nanowire MOSFETs with High Performance.
- 2021Doping Profiles in Ultrathin Vertical VLS-Grown InAs Nanowire MOSFETs with High Performancecitations
- 2020Effect of Cold Sintering Process (CSP) on the Electro-Chemo-Mechanical Properties of Gd-doped Ceria (GDC)citations
- 2020Shadow Epitaxy for In Situ Growth of Generic Semiconductor/Superconductor Hybridscitations
- 2019Evolution of intermetallic GaPd2/SiO2 catalyst and optimization for methanol synthesis at ambient pressurecitations
- 2015Intermetallic GaPd2 Nanoparticles on SiO2 for Low-Pressure CO2 Hydrogenation to Methanolcitations
- 2015Intermetallic GaPd 2 Nanoparticles on SiO 2 for Low-Pressure CO 2 Hydrogenation to Methanol:Catalytic Performance and In Situ Characterizationcitations
- 2012H2 splitting on Pt, Ru and Rh nanoparticles supported on sputtered HOPGcitations
- 2012Size dependent reactivity of metal nanoparticles and alloys supported on HOPG, probed by the H-D exchange and the NH3 decomposition reactions
- 2012Strong Metal Support Interaction of Pt and Ru Nanoparticles Deposited on HOPG Probed by the H-D Exchange Reactioncitations
- 2011H2-splitting on Pt/Ru alloys supported on sputtered HOPGcitations
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article
H2-splitting on Pt/Ru alloys supported on sputtered HOPG
Abstract
The equilibrium hydrogen exchange rate between adsorbed and gas phase hydrogen at 1 bar is measured on three Pt/Ru systems: Pt overlayers on Ru films, Ru overlayers on Pt films, and Pt/Ru bulk alloys, with different Pt/Ru compositions. The catalysts are prepared by electron beam physical vapor deposition and supported on a sputtered HOPG substrate. The hydrogen exchange rate is measured in the temperature range 40-200 °C at 1 bar, by utilization of the H-D exchange reaction. We find that the exchange rate, r, and the dissociative sticking probability, S, as a function of surface concentration exceed the values measured on the individual metals and have a maximum for a composition of 2/7 Pt in the bulk alloys. The Pt overlayers on Ru films give similar results for r and S, and maximum activity is found when 4 Å of Pt are deposited on 50 Å Ru films. ISS spectra show that both Ru and Pt are on the surface, which indicates the formation of a surface alloy already at 200 °C. We also find that the maximum activity is given by the alloys with a surface composition of Pt/Ru equal to a 1:1 ratio. Experiments are also carried out in the presence of 10 ppm CO for the Pt-Ru bulk alloys. We find that alloying Pt with Ru improves significantly the resistance toward CO poisoning with respect to pure Pt, and the resistance increases with an increasing amount of Ru in the bulk alloys. The faster hydrogen exchange rate with respect to the pure metals and the higher CO tolerance of the alloys are attributed to strain and ligand effects, caused by the compression of the surface due to the presence of the larger Pt atoms in the neighboring Ru atoms. The apparent energy of desorption at equilibrium, Eapp, for the three Pt-Ru systems is found to decrease with an increasing amount of Ru in the alloys, and it is attributed to geometrical ensemble effects. © 2011 American Chemical Society.