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Platinum-rich shell, platinum-poor core
Date:10/23/2007

reducing activity of our new electrocatalytic material is unsurpassedit is four to five times higher than that of pure platinum. In addition, we have demonstrated how to incorporate and activate this material in situ in a fuel cell, says Strasser. The observed increase in surface area of the nanoparticles is not enough to explain the increased activity. Strasser suspects that special altered structural characteristics of the surface play a role. Although the surface consists mostly of platinum, the distances between the platinum atoms on the particle surface seem to be shorter than those in pure platinum. This compression can be stabilized by the alloy core, which shows even shorter Pt-Pt distances because of the presence of copper and cobalt. In addition, the copper-rich core seems to influence the electronic properties of the platinum shell. Theoretical calculations have suggested that the oxygen can thus bind optimally to the particle surface, allowing it to be more easily reduced.


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Contact: Peter Strasser
pstrasser@uh.edu
713-743-4310
John Wiley & Sons, Inc.
Source:Eurekalert

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