Journal
SCIENCE
Volume 349, Issue 6246, Pages 412-416Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aab0801
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Funding
- Georgia Institute of Technology
- China Scholarship Council
- U.S. Department of Energy (DOE)-Basic Energy Sciences (BES), Office of Chemical Sciences [DE-FG02-05ER15731]
- DOE Office of Biological and Environmental Research at the Pacific Northwest National Laboratory
- DOE [DE-AC02-06CH11357, DE-AC02-05CH11231]
- Oak Ridge National Laboratory's Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility
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A cost-effective catalyst should have a high dispersion of the active atoms, together with a controllable surface structure for the optimization of activity, selectivity, or both. We fabricated nanocages by depositing a few atomic layers of platinum (Pt) as conformal shells on palladium (Pd) nanocrystals with well-defined facets and then etching away the Pd templates. Density functional theory calculations suggest that the etching is initiated via a mechanism that involves the formation of vacancies through the removal of Pd atoms incorporated into the outermost layer during the deposition of Pt. With the use of Pd nanoscale cubes and octahedra as templates, we obtained Pt cubic and octahedral nanocages enclosed by {100} and {111} facets, respectively, which exhibited distinctive catalytic activities toward oxygen reduction.
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