Journal
CHEMISTRY OF MATERIALS
Volume 25, Issue 4, Pages 530-535Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm3029164
Keywords
PEM fuel cells; platinum-alloyed catalysts; aberration-corrected STEM; nanoparticles
Funding
- DOE Hydrogen Initiative program [DE-FG02-05ER15728]
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Fuel Cell Technologies Program through Argonne National Laboratory [DE-AC02-06CH11357]
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program
- R.A. Welch Foundation [F-1535]
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Pt3Co nanoparticles are used to promote the oxygen reduction kinetics and increase the efficiency of proton exchange membrane (PEM) fuel cells. For the first time, aberration-corrected scanning transmission electron microscopy (STEM), STEM image simulations, and DFT calculations are combined to provide insight into the origin of enhanced catalysis of Pt3Co nanoparticles. Acid-leached nanoparticles exhibit a solid-solution structure but heterogeneous composition, while heat-treated nanoparticles exhibit an ordered structure, except for the first three surface layers where Pt enrichment is observed.
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