Journal
NANO LETTERS
Volume 12, Issue 1, Pages 490-497Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl203975u
Keywords
Atomic-scale spectroscopic imaging; proton exchange membrane fuel cell; Pt-Co; catalyst degradation; coalescence; Ostwald ripening
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Funding
- Energy Materials Center at Cornell (EMC2), an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001086]
- Nanoscale Science and Engineering Initiative of the National Science Foundation under NSF [EEC-0117770, 064654]
- NDSEG
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The thousand-fold increase in data-collection speed enabled by aberration-corrected optics allows us to overcome an electron microscopy paradox: how to obtain atomic-resolution chemical structure in individual nanoparticles yet record a statistically significant sample from an inhomogeneous population. This allowed us to map hundreds of Pt-Co nanoparticles to show atomic-scale elemental distributions across different stages of the catalyst aging in a proton-exchange-membrane fuel cell, and relate Pt-shell thickness to treatment, particle size, surface orientation, and ordering.
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