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Wojtek Dmowski, Takeshi Egami, Karen E. Swider-Lyons, Wen-Fu Yan, Sheng Dai, Steven H. Overbury

Local atomic structure in disordered and nanocrystalline catalytic materials

Keywords: Pair distribution function, X-ray scattering, Nanocrystalline materials, Catalysts

The power of the atomic pair density function method to study the local atomic structure of dispersed materials is discussed for three examples (I) supercapacitor hydrous ruthenia, (II) electroctalyst platinum-iron phosphate and (III) nanoparticle gold catalyst. Hydrous ruthenia appears to be amorphous, but was found to be nanocomposite with RuO₂ nanocrystals supporting electronic and hydrous boundaries protonic conductivity. A platinum-iron phosphate electrocatalyst, that exhibits activity for the oxygen reduction reaction has platinum in a non-metallic state. In catalysts comprised of gold nanoparticles supported on TiO₂, atomic correlations in the second atomic shell were observed suggesting interaction with the support that could modify gold chemical activity.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 222, 11/2007
Pages: 617 - 624

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