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Issue 22, 2004
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Noble metal decoration of single crystal platinum surfaces to create well-defined bimetallic electrocatalysts

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Abstract

Electrocatalytic studies on bimetallic single crystal electrodes present a unique opportunity to explore the reactivity of complex surfaces with known structure and composition. Such electrochemical studies, together with measurements in ultra-high vacuum, provide the theoretical and experimental basis for rational design of more active electrocatalysts. Pure platinum, though the most active single-component electrocatalyst for many reactions, is still not active enough for some applications, particularly in fuel cell technology, and cannot be considered as a true catalyst for most electrocatalytic processes. Therefore, a concerted effort has been made in the last 40 years to enhance the electrocatalytic activity of Pt via modification by a second metal. Most early work used polycrystalline alloys, but in recent years, many workers have begun modifying (decorating) Pt single crystals by deposition of a second noble metal, which is usually ruthenium, palladium, rhodium, osmium, or silver. A critical review of electrocatalysis on such well-defined bimetallic surfaces is offered, and a brief analysis of the inverted approach, in which single crystal noble metal surfaces are modified by Pt deposition, is also presented.

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Article information


Submitted
15 Jun 2004
Accepted
30 Sep 2004
First published
20 Oct 2004

Phys. Chem. Chem. Phys., 2004,6, 5094-5118
Article type
Invited Article

Noble metal decoration of single crystal platinum surfaces to create well-defined bimetallic electrocatalysts

J. S. Spendelow and A. Wieckowski, Phys. Chem. Chem. Phys., 2004, 6, 5094
DOI: 10.1039/B409140J

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