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Enhanced Activity for Oxygen Reduction Reaction on “Pt3Co” Nanoparticles: Direct Evidence of Percolated and Sandwich-Segregation Structures
Abstract
Atomically resolved structures and compositions of Pt alloy nanoparticles were obtained using aberration-corrected high-angle dark field imaging, which was correlated to specific ORR activity based on a Pt surface area. The enhanced specific ORR activity (approximately 2 times relative to Pt) of acid-treated "Pt3Co" nanoparticles can be related to composition variations at the atomic scale and the formation of percolated Pt-rich and Pt-poor regions within individual particles. Upon annealing, we show direct evidence of surface Pt sandwich-segregation structures, which correspond to a specific ORR activity approximately 4 times relative to Pt.
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Metadata
- Authors
- Chen, S., Ferreira, P. J., Sheng, W., Yabuuchi, N., Allard, L. F., & Shao-Horn, Y.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-09-24
- Volume
- 130
- Issue
- 42
- Pages
- 13818-13819
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W1964022307
- Cited by
- 277
- References
- 25
- FWCI
- 13.02
- Type
- journal article
- Language
- en
- Open access
- closed
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