Local atomic structure in disordered and nanocrystalline catalytic materials

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

doi:10.1524/zkri.2007.222.11.617

Local atomic structure in disordered and nanocrystalline catalytic materials

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

Chemical Sciences Division

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

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 nonmetallic 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.

Original language	English
Pages (from-to)	617-624
Number of pages	8
Journal	Zeitschrift fur Kristallographie
Volume	222
Issue number	11
DOIs	https://doi.org/10.1524/zkri.2007.222.11.617
State	Published - 2007

Funding

Foundation through grant DMR04-04781 and in part by the Office of Naval Research. WY, SD and SHO are supported by the Office of Basic Energy Sciences, U.S. Department of Energy. We would like to thank D. Robinson (APS, MUCAT) and J. Karapetrova (APS, UNI-CAT), W. Calibe (NSLS, X19A) for the help with experimental setup. The operation of the National Synchrotron Light Source is supported by the Department of Energy, Division of Materials Sciences and of Chemical Sciences. Use of the Advanced Photon Source is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The Midwest Universities Collaborative Access Team (MUCAT) sector at the APS is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, through the Ames Laboratory under Contract No. W-7405-Eng-82. Acknowledgments. This work was supported by the National Science

Funders	Funder number
Midwest Universities Collaborative Access Team
National Science
Office of Basic Energy Sciences
Office of Naval Research
U.S. Department of Energy
Office of Science
Ames Laboratory
Division of Materials Sciences and Engineering

Keywords

Catalysts
Nanocrystalline materials
Pair distribution function
X-ray scattering

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10.1524/zkri.2007.222.11.617

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AU - Dai, Sheng

AU - Overbury, Steven H.

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AB - 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 nonmetallic 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.

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Local atomic structure in disordered and nanocrystalline catalytic materials

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