Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 130, Issue 42, Pages 13818-13819Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja802513y
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Funding
- DOE Hydrogen Initiative program [DE-FG02-05ER15728]
- National Science Foundation [DMR 02-13282]
- Asst. Sec. Renew, Energy, Vehicle Tech.
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [819762] Funding Source: National Science Foundation
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Atomically resolved structures and composition 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 (similar to 2 times relative to Pt) of acid-treated Pt3Co nanoparticles can be related to composition variations at the atomic scale and 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 similar to 4 times relative to Pt.
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