Lattice Strain Distributions in Individual Dealloyed Pt-Fe Catalyst Nanoparticles.
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.
Beijing National Center for Electron Microscopy, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Lin
L
Gan
Beijing National Center for Electron Microscopy, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Rong
R
Yu
Beijing National Center for Electron Microscopy, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Jun
J
Luo
Beijing National Center for Electron Microscopy, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Zhiying
Z
Cheng
Beijing National Center for Electron Microscopy, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Jing
J
Zhu
Pt bimetallic catalyst; core−shell nanoparticles; electron microscopy; lattice strain; oxygen reduction