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Direct Observations of Oxygen-induced Platinum Nanoparticle Ripening Studied by In Situ TEM
Open accessAbstract
This study addresses the sintering mechanism of Pt nanoparticles dispersed on a planar, amorphous Al(2)O(3) support as a model system for a catalyst for automotive exhaust abatement. By means of in situ transmission electron microscopy (TEM), the model catalyst was monitored during the exposure to 10 mbar air at 650 degrees C. Time-resolved image series unequivocally reveal that the sintering of Pt nanoparticles was mediated by an Ostwald ripening process. A statistical analysis of an ensemble of Pt nanoparticles shows that the particle size distributions change shape from an initial Gaussian distribution via a log-normal distribution to a Lifshitz-Slyozov-Wagner (LSW) distribution. Furthermore, the time-dependency of the ensemble-averaged particle size and particle density is determined. A mean field kinetic description captures the main trends in the observed behavior. However, at the individual nanoparticle level, deviations from the model are observed suggesting in part that the local environment influences the atom exchange process.
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Cites
Atom-Resolved Imaging of Dynamic Shape Changes in Supported Copper Nanocrystals
Hansen, P. L., Wagner, J. B., Helveg, S., Rostrup-Nielsen, J. R., Clausen, B. S., & Topsøe, H. (2002) · Science · doi:10.1126/science.1069325 · Cited by 1,261
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Design criteria for stable Pt/C fuel cell catalysts
Meier, J. C., Galeano, C., Katsounaros, I., Witte, J., Bongard, H. J., Topalov, A. A., Baldizzone, C., Mezzavilla, S., Schüth, F., & Mayrhofer, K. J. J. (2014) · Beilstein Journal of Nanotechnology · doi:10.3762/bjnano.5.5 · Cited by 559
Surface diffusion-limited lifetime of silver and copper nanofilaments in resistive switching devices
Wang, W., Wang, M., Ambrosi, E., Bricalli, A., Laudato, M., Sun, Z., Chen, X., & Ielmini, D. (2019) · Nature Communications · doi:10.1038/s41467-018-07979-0 · Cited by 328
Metadata
- Authors
- Simonsen, S. B., Chorkendorff, I., Dahl, S., Skoglundh, M., Sehested, J., & Helveg, S.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2010-05-19
- Volume
- 132
- Issue
- 23
- Pages
- 7968-7975
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W1999243081
- Cited by
- 428
- References
- 1
- FWCI
- 10.50
- Type
- journal article
- Language
- en
- Open access
- green
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- Simonsen, S. B., Chorkendorff, I., Dahl, S., Skoglundh, M., Sehested, J., & Helveg, S. (2010). Direct Observations of Oxygen-induced Platinum Nanoparticle Ripening Studied by In Situ TEM. Journal of the American Chemical Society. https://doi.org/10.1021/ja910094r
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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