期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 3, 期 7, 页码 934-938出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz300192b
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资金
- National 973 Project of China
- National Science Foundation of China [21003080]
Lattice strain is considered to play an important role in the oxygen reduction catalysis on Pt-based catalysts. However, so far, direct evidence of the lattice strain in the catalyst nanoparticles has not been achieved. By using aberration-corrected high-resolution transmission electron microscopy combined with image simulations, a unique core-shell structure, that is, a percolated lattice-contracted Pt-Fe alloy core and a Pt-rich surface with a gradient compressive strain, was directly demonstrated within individual dealloyed Pt-Fe nanoparticles and thus provides direct evidence for the strain effect on their enhanced oxygen reduction activity.
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