Revealing the atomic restructuring of Pt-Co nanoparticles.
We studied Pt-Co bimetallic nanoparticles during oxidation in O2 and reduction in H2 atmospheres using an aberration corrected environmental transmission electron microscope. During oxidation Co migrates to the nanoparticle surface forming a strained epitaxial CoO film. It subsequently forms islands via strain relaxation. The atomic restructuring is captured as a function of time. During reduction cobalt migrates back to the bulk, leaving a monolayer of platinum on the surface.
Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720 United States.
Huolin L
HL
Xin
Selim
S
Alayoglu
Runzhe
R
Tao
Arda
A
Genc
Chong-Min
CM
Wang
Libor
L
Kovarik
Eric A
EA
Stach
Lin-Wang
LW
Wang
Miquel
M
Salmeron
Gabor A
GA
Somorjai
Haimei
H
Zheng