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          Institute: Fritz-Haber-Institut     Collection: Molecular Physics     Display Documents



ID: 60105.0, Fritz-Haber-Institut / Molecular Physics
Structural and electrochemical studies of Pt-Sn nanoparticulate catalysts
Authors:Boucher, A.-C.; Alonso-Vante, Nicolas; Dassenoy, Fabrice; Vogel, Walter
Language:English
Date of Publication (YYYY-MM-DD):2003-11-21
Title of Journal:Langmuir
Journal Abbrev.:Langmuir
Volume:19
Issue / Number:26
Start Page:10885
End Page:10891
Copyright:2003 American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Structural and stability studies of bimetallic Pt-Sn (3:1) nanoparticles were performed in situ via X-ray diffraction at wide angles (WAXS). The homemade bimetallic catalyst (Pt-Sn) ccomp (ccomp = from carbonyl complex) was synthesized in mild conditions from a Pt-carbonyl chemical precursor. A relatively narrow size distribution (2.4 ± 0.9 nm) of such a bimetallic catalyst supported onto carbon Vulcan XC72 was obtained at room temperature. Its electrochemical behavior was compared to that of a commercial catalyst. The WAXS study revealed that such a catalyst, prepared via the carbonyl route, has a certain degree of surface disorder (high Debye parameter, B), which enhances the electrocatalytic activity for hydrogen adsorption. Furthermore, WAXS also demonstrated that the structural stability of this bimetallic catalyst is maintained at the annealing temperature employed (500 C), although the particle size increases from 1.6 to 2.2 nm. Electrochemical underpotential deposition studies, via copper deposition, also provide information concerning the state of the nanoparticulate surface of the various platinum-based catalysts investigated.
External Publication Status:published
Document Type:Article
Communicated by:Gerard Meijer
Affiliations:Fritz-Haber-Institut/Molecular Physics
Identifiers:URL:http://pubs.acs.org/cgi-bin/abstract.cgi/langd5/20...
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