Platinum-based nanocages with subnanometer-thick walls and well-defined, controllable facets
Abstract
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.
- Authors:
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); University of Wisconsin-Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Contributing Org.:
- China Scholarship Council; EMSL; CNM at ANL; NERSC; ORNL’s Center for Nanophase Materials Sciences; Arizona State University
- OSTI Identifier:
- 1355818
- Alternate Identifier(s):
- OSTI ID: 1265782; OSTI ID: 1395998; OSTI ID: 1994818
- Grant/Contract Number:
- AC05-00OR22725; AC02-05CH11231; AC02-06CH11357; FG02-05ER15731
- Resource Type:
- Published Article
- Journal Name:
- Science
- Additional Journal Information:
- Journal Name: Science Journal Volume: 349 Journal Issue: 6246; Journal ID: ISSN 0036-8075
- Publisher:
- American Association for the Advancement of Science (AAAS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
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., and Xia, Y. Platinum-based nanocages with subnanometer-thick walls and well-defined, controllable facets. United States: N. p., 2015.
Web. doi:10.1126/science.aab0801.
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. Platinum-based nanocages with subnanometer-thick walls and well-defined, controllable facets. United States. https://doi.org/10.1126/science.aab0801
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., and Xia, Y. Thu .
"Platinum-based nanocages with subnanometer-thick walls and well-defined, controllable facets". United States. https://doi.org/10.1126/science.aab0801.
@article{osti_1355818,
title = {Platinum-based nanocages with subnanometer-thick walls and well-defined, controllable facets},
author = {Zhang, L. and Roling, L. T. and Wang, X. and Vara, M. and Chi, M. and Liu, J. and Choi, S. -I. and Park, J. and Herron, J. A. and Xie, Z. and Mavrikakis, M. and Xia, Y.},
abstractNote = {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.},
doi = {10.1126/science.aab0801},
journal = {Science},
number = 6246,
volume = 349,
place = {United States},
year = {Thu Jul 23 00:00:00 EDT 2015},
month = {Thu Jul 23 00:00:00 EDT 2015}
}
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https://doi.org/10.1126/science.aab0801
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