Platinum-based nanocages with subnanometer-thick walls and well-defined, controllable facets

Zhang, L.; Roling, L. T.; Wang, X.; Vara, M.; Chi, M.; Liu, J.; Choi, S. -I.; Park, J.; Herron, J. A.; Xie, Z.; Mavrikakis, M.; Xia, Y.

doi:10.1126/science.aab0801

Title: Platinum-based nanocages with subnanometer-thick walls and well-defined, controllable facets

Journal Article · Thu Jul 23 00:00:00 EDT 2015 · Science

DOI:https://doi.org/10.1126/science.aab0801· OSTI ID:1355818

Zhang, L.; Roling, L. T.; Wang, X.; Vara, M.; Chi, M.; Liu, J.; Choi, S. -I.; Park, J.; Herron, J. A.; Xie, Z.; Mavrikakis, M.; Xia, Y.

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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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); University of Wisconsin-Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Contributing Organization:: China Scholarship Council; EMSL; CNM at ANL; NERSC; ORNL’s Center for Nanophase Materials Sciences; Arizona State University

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231; AC02-06CH11357; FG02-05ER15731

OSTI ID:: 1355818

Alternate ID(s):: OSTI ID: 1265782; OSTI ID: 1395998; OSTI ID: 1994818

Journal Information:: Science, Journal Name: Science Vol. 349 Journal Issue: 6246; ISSN 0036-8075

Publisher:: American Association for the Advancement of Science (AAAS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 784 works

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