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  Catalytic Pt-on-Au Nanostructures: Why Pt Becomes More Active on Smaller Au Particles

Zhang, G.-R., Zhao, D. S., Feng, Y.-Y., Zhang, B. S., Su, D. S., Liu, G., et al. (2012). Catalytic Pt-on-Au Nanostructures: Why Pt Becomes More Active on Smaller Au Particles. ACS Nano, 6(3), 2226-2236. doi:10.1021/nn204378t.

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 Urheber:
Zhang, Gui-Rong1, Autor
Zhao, Dang Sheng1, Autor
Feng, Yuan-Yuan1, Autor
Zhang, Bing Sen2, Autor           
Su, Dang Sheng2, Autor           
Liu, Gang1, Autor
Xu, Bo-Qing1, Autor
Affiliations:
1Innovative Catalysis Program, Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China, ou_persistent22              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Schlagwörter: gold; platinum; bimetallic nanostructure; formic acid electrooxidation; oxygen reduction; size effect; surface electronic structure
 Zusammenfassung: Platinum is a widely used precious metal in many catalytic nanostructures. Engineering the surface electronic structure of Pt-containing bi- or multimetallic nanostructure to enhance both the intrinsic activity and dispersion of Pt has remained a challenge. By constructing Pt-on-Au (PtAu) nanostructures using a series of monodisperse Au nanoparticles in the size range of 2–14 nm, we disclose herein a new approach to steadily change both properties of Pt in electrocatalysis with downsizing of the Au nanoparticles. A combined tuning of Pt dispersion and its surface electronic structure is shown as a consequence of the changes in the size and valence-band structure of Au, which leads to significantly enhanced Pt mass-activity on the small Au nanoparticles. Fully dispersed Pt entities on the smallest Au nanoparticles (2 nm) exhibit the highest mass-activity to date towards formic acid electrooxidation, being 2 orders of magnitude (75–300 folds) higher than conventional Pt/C catalyst. Fundamental relationships correlating the Pt intrinsic activity in PtAu nanostructures with the experimentally determined surface electronic structures (d-band center energies) of the Pt entities and their underlying Au nanoparticles are established.

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Sprache(n): eng - English
 Datum: 2012-02-102012-03-27
 Publikationsstatus: Erschienen
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 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1021/nn204378t
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Titel: ACS Nano
Genre der Quelle: Zeitschrift
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Seiten: - Band / Heft: 6 (3) Artikelnummer: - Start- / Endseite: 2226 - 2236 Identifikator: -