Chemistry

Mild Metal Mixing

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Science  18 Jan 2008:
Vol. 319, Issue 5861, pp. 259
DOI: 10.1126/science.319.5861.259c

Combining a second metal with platinum (Pt) to form an intermetallic can reduce costs, inhibit poisoning, and in certain cases improve the reactivity of this widely used catalyst. However, the need for particle annealing at high temperature causes sintering that reduces the particle surface area and introduces shape and size distortions. Bauer et al. present a milder technique whereby Pt nanoparticles synthesized with specific shape and size dispersity are treated in low-temperature solution with metal salts to form Pt-M intermetallics (M can be tin, lead, or several other metals). When stabilized by growth on a support such as alumina or ceria, the Pt particles did not aggregate. In the case of PtPb particles supported on Vulcan XC-72, a conductive carbon black pigment, the electrocatalytic oxidation of formic acid occurred at a lower onset potential in comparison with commercial PtRu particles on the same support. — MSL

J. Mater. Chem. 18, 275 (2008).

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