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Title

Nanoporous Pt-based catalysts prepared by chemical dealloying of magnetron-sputtered Pt-Cu thin films for the catalytic combustion of hydrogen

AuthorsGiarratano, F.; Arzac, G.M. ; Godinho, V. ; Hufschmidt, D. ; Jiménez de Haro, María del Carmen ; Montes, O.; Fernández-Camacho, A.
KeywordsHydrogen combustion
Pt-Cu thin films
Magnetron sputtering
Nanoporous Pt
Dealloying
Issue Date30-Apr-2018
PublisherElsevier
CitationApplied Catalysis B - Environmental, 235: 168-176 (2018)
AbstractIn this work, we prepared SiC-supported Pt-Cu thin films by magnetron sputtering for use as catalysts for the combustion of hydrogen under oxidizing conditions. We tested the catalysts as prepared and after chemical dealloying. A methodology is presented to fabricate catalytic thin films of a desired composition with tailored magnetron targets with lower Pt consumption. The deposition gas was changed to prepare columnar (Ar-deposited) and closed-porous (He-deposited) films to study the effect of the microstructure on the activity. The effect of composition was also studied for the columnar samples. The as-prepared Pt-Cu thin films showed significant activity only at temperatures higher than 100 °C. Dealloying permitted an increase in the activity to achieve near room-temperature activity. The dealloyed closed-porous He-deposited sample was the most active, being able to convert as much as 13.15 LH2·min−1 gPt−1 at 70 °C (Ea = 1 kJ mol−1). This sample was preferentially dealloyed on the surface, yielding an almost pure Pt shell (96% at. Pt) and a Cu-depleted interior (71% at. Pt). This compositional inhomogeneity enabled the sample to achieve enhanced activity compared to the Ar-deposited columnar sample (with similar initial composition, but uniformly dealloyed), probably due to the compressive surface lattice strain. The dealloyed closed-porous He-deposited sample was shown to be durable over five cycles.
Publisher version (URL)https://doi.org/10.1016/j.apcatb.2018.04.064
URIhttp://hdl.handle.net/10261/164826
DOI10.1016/j.apcatb.2018.04.064
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