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Article Dans Une Revue Journal of Crystal Growth Année : 2005

Electrocristallization of platinum nanoparticles supported on carbon analyzed with standard and anomalous X-ray diffraction

Résumé

X-ray powder diffraction using synchrotron radiation in classical and anomalous dispersion mode is used to determine the amount of platinum and the mean diameter of catalyst platinum nanoparticles, round 2–3 nm diameters, supported on carbon. We study the early stages of the electrochemical formation of platinum nanoparticles from PtCl42− species pre-adsorbed on carbon and embedded inside a carbon-Nafion layer, which represents a fuel cell electrode. XRD results demonstrate that, with not too high superficial concentrations, new particles appear for each current pulse. Hydrogen evolution becomes the main electrochemical reaction as the platinum particle size increases, limiting the particle growth.

Dates et versions

hal-00386426 , version 1 (21-05-2009)

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Sébastien Adora, Jean-Paul Simon, Yvonne Soldo-Olivier, René Faure, Robert Durand, et al.. Electrocristallization of platinum nanoparticles supported on carbon analyzed with standard and anomalous X-ray diffraction. Journal of Crystal Growth, 2005, 275 (1-2), pp. e2207-e2210. ⟨10.1016/j.jcrysgro.2004.11.245⟩. ⟨hal-00386426⟩
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