Designing Efficient Catalysts through Bimetallic Architecture: Rh@Pt Nanocubes as a Case Study
Abstract
Bimetallic nanocatalysts often have increased activities and stabilities over their monometallic counterparts due to surface strain effects and electron transfer between the two metals. We demonstrate that the performance of a nanocatalyst can be precisely manipulated in shape-controlled nanocrystals through a bimetallic core@shell architecture. This ability is achieved in a model core@shell Rh@Pt nanocube system through control of shell thickness. The enhanced performance with thin-shelled nanocrystals is correlated with the weakening of surface–adsorbate interactions. In these thin-shelled Rh@Pt nanocubes, the maximum current density achieved during formic acid oxidation was over 2 times greater than that achieved with similarly sized Pt nanocubes, with a decreased CO poisoning ratio as well. Finally, the strategy employed here should also enhance the performance of many other bimetallic nanomaterials composed of more cost-effective metals too.
- Authors:
-
[1]
- Indiana Univ., Bloomington, IN (United States). Dept. of Chemistry
- Rockhurst Univ., Kansas City, MO (United States). Dept. of Chemistry
- Publication Date:
- Research Org.:
- Indiana Univ., Bloomington, IN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1482343
- Alternate Identifier(s):
- OSTI ID: 1377949
- Grant/Contract Number:
- SC0010489; CHE-1048613; DMR-1126394
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ChemNanoMat
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 11; Journal ID: ISSN 2199-692X
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; bimetallic nanoparticles; formic acid oxidation; platinum; rhodium; Sabatier principle
Citation Formats
Harak, Ethan W., Koczkur, Kallum M., Harak, Dale W., Patton, Paul, and Skrabalak, Sara E. Designing Efficient Catalysts through Bimetallic Architecture: Rh@Pt Nanocubes as a Case Study. United States: N. p., 2017.
Web. doi:10.1002/cnma.201700167.
Harak, Ethan W., Koczkur, Kallum M., Harak, Dale W., Patton, Paul, & Skrabalak, Sara E. Designing Efficient Catalysts through Bimetallic Architecture: Rh@Pt Nanocubes as a Case Study. United States. https://doi.org/10.1002/cnma.201700167
Harak, Ethan W., Koczkur, Kallum M., Harak, Dale W., Patton, Paul, and Skrabalak, Sara E. Wed .
"Designing Efficient Catalysts through Bimetallic Architecture: Rh@Pt Nanocubes as a Case Study". United States. https://doi.org/10.1002/cnma.201700167. https://www.osti.gov/servlets/purl/1482343.
@article{osti_1482343,
title = {Designing Efficient Catalysts through Bimetallic Architecture: Rh@Pt Nanocubes as a Case Study},
author = {Harak, Ethan W. and Koczkur, Kallum M. and Harak, Dale W. and Patton, Paul and Skrabalak, Sara E.},
abstractNote = {Bimetallic nanocatalysts often have increased activities and stabilities over their monometallic counterparts due to surface strain effects and electron transfer between the two metals. We demonstrate that the performance of a nanocatalyst can be precisely manipulated in shape-controlled nanocrystals through a bimetallic core@shell architecture. This ability is achieved in a model core@shell Rh@Pt nanocube system through control of shell thickness. The enhanced performance with thin-shelled nanocrystals is correlated with the weakening of surface–adsorbate interactions. In these thin-shelled Rh@Pt nanocubes, the maximum current density achieved during formic acid oxidation was over 2 times greater than that achieved with similarly sized Pt nanocubes, with a decreased CO poisoning ratio as well. Finally, the strategy employed here should also enhance the performance of many other bimetallic nanomaterials composed of more cost-effective metals too.},
doi = {10.1002/cnma.201700167},
journal = {ChemNanoMat},
number = 11,
volume = 3,
place = {United States},
year = {2017},
month = {8}
}
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Figures / Tables:
Figure 1: TEM images of Rh@Pt nanocubes with Pt shell thicknesses of (A) 1.2 ML (B) 2.6 ML (C) 5.6 ML and (D) 7.4 ML. The scatter plot in (E) shows the linear relationship between the amount of Pt(acac)2 used and the resulting Pt shell thickness. Scale bars are 5more »
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