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Origin of Oxygen Reduction Reaction Activity on “Pt3Co” Nanoparticles: Atomically Resolved Chemical Compositions and Structures
Abstract
Rotating disk electrode measurements of acid-treated “Pt 3 Co” nanoparticles showed specific oxygen reduction reaction (ORR) activity (∼0.7 mA/cm Pt 2 at 0.9 V vs RHE in 0.1 M HClO 4 at room temperature), twice that of Pt nanoparticles. Upon annealing at 1000 K in vacuum, the ORR activity at 0.9 V was increased to ∼1.4 mA/cm Pt 2 (four times that of Pt nanoparticles). High-resolution transmission electron microscopy and aberration-corrected high-angle annular dark-field in the scanning transmission electron microscope was used to reveal surface atomic structure and chemical composition variations of “Pt 3 Co” nanoparticles on the atomic scale. Such information was then correlated to averaged Pt−Pt distance obtained from synchrotron X-ray powder diffraction data, surface coverage of oxygenated species from cyclic voltammograms, and synchrotron X-ray absorption spectroscopy. It is proposed that ORR activity enhancement of acid-leached “Pt 3 Co” relative to Pt nanoparticles is attributed to the formation of a percolated structure with Pt-rich and Pt-poor regions within individual particles, while the increase in the specific ORR activity of annealed “Pt 3 Co” nanoparticles relative to Pt can be attributed to the presence of surface Pt segregation.
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Metadata
- Authors
- Chen, S., Sheng, W., Yabuuchi, N., Ferreira, P. J., Allard, L. F., & Shao-Horn, Y.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-12-24
- Volume
- 113
- Issue
- 3
- Pages
- 1109-1125
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2021880540
- Cited by
- 273
- References
- 19
- FWCI
- 11.69
- Type
- journal article
- Language
- en
- Open access
- closed
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