In situ atomic-scale observation of oxygen-driven core-shell formation in Pt3Co nanoparticles
The catalytic performance of core-shell platinum alloy nanoparticles is typically superior to that of pure platinum nanoparticles for the oxygen reduction reaction in fuel cell cathodes. Thorough understanding of core-shell formation is critical for atomic-scale design and control of the platinum sh...
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| Published in | Nature communications Vol. 8; no. 1; pp. 1 - 8 |
|---|---|
| Main Authors | , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
London
Nature Publishing Group UK
07.08.2017
Nature Publishing Group Nature Portfolio |
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| Abstract | The catalytic performance of core-shell platinum alloy nanoparticles is typically superior to that of pure platinum nanoparticles for the oxygen reduction reaction in fuel cell cathodes. Thorough understanding of core-shell formation is critical for atomic-scale design and control of the platinum shell, which is known to be the structural feature responsible for the enhancement. Here we reveal details of a counter-intuitive core-shell formation process in platinum-cobalt nanoparticles at elevated temperature under oxygen at atmospheric pressure, by using advanced in situ electron microscopy. Initial segregation of a thin platinum, rather than cobalt oxide, surface layer occurs concurrently with ordering of the intermetallic core, followed by the layer-by-layer growth of a platinum shell via Ostwald ripening during the oxygen annealing treatment. Calculations based on density functional theory demonstrate that this process follows an energetically favourable path. These findings are expected to be useful for the future design of structured platinum alloy nanocatalysts.
Core-shell platinum alloy nanoparticles are promising catalysts for oxygen reduction, however a deeper understanding of core-shell formation is still required. Here the authors report oxygen-driven formation of core-shell Pt
3
Co nanoparticles, seen at the atomic scale with in situ electron microscopy at ambient pressure. |
|---|---|
| AbstractList | The catalytic performance of core-shell platinum alloy nanoparticles is typically superior to that of pure platinum nanoparticles for the oxygen reduction reaction in fuel cell cathodes. Thorough understanding of core-shell formation is critical for atomic-scale design and control of the platinum shell, which is known to be the structural feature responsible for the enhancement. Here we reveal details of a counter-intuitive core-shell formation process in platinum-cobalt nanoparticles at elevated temperature under oxygen at atmospheric pressure, by using advanced in situ electron microscopy. Initial segregation of a thin platinum, rather than cobalt oxide, surface layer occurs concurrently with ordering of the intermetallic core, followed by the layer-by-layer growth of a platinum shell via Ostwald ripening during the oxygen annealing treatment. Calculations based on density functional theory demonstrate that this process follows an energetically favourable path. These findings are expected to be useful for the future design of structured platinum alloy nanocatalysts.
Core-shell platinum alloy nanoparticles are promising catalysts for oxygen reduction, however a deeper understanding of core-shell formation is still required. Here the authors report oxygen-driven formation of core-shell Pt
3
Co nanoparticles, seen at the atomic scale with in situ electron microscopy at ambient pressure. The catalytic performance of core-shell platinum alloy nanoparticles is typically superior to that of pure platinum nanoparticles for the oxygen reduction reaction in fuel cell cathodes. Thorough understanding of core-shell formation is critical for atomic-scale design and control of the platinum shell, which is known to be the structural feature responsible for the enhancement. Here we reveal details of a counter-intuitive core-shell formation process in platinum-cobalt nanoparticles at elevated temperature under oxygen at atmospheric pressure, by using advanced in situ electron microscopy. Initial segregation of a thin platinum, rather than cobalt oxide, surface layer occurs concurrently with ordering of the intermetallic core, followed by the layer-by-layer growth of a platinum shell via Ostwald ripening during the oxygen annealing treatment. Calculations based on density functional theory demonstrate that this process follows an energetically favourable path. These findings are expected to be useful for the future design of structured platinum alloy nanocatalysts. Core-shell platinum alloy nanoparticles are promising catalysts for oxygen reduction, however a deeper understanding of core-shell formation is still required. Here the authors report oxygen-driven formation of core-shell Pt3Co nanoparticles, seen at the atomic scale with in situ electron microscopy at ambient pressure. The catalytic performance of core-shell platinum alloy nanoparticles is typically superior to that of pure platinum nanoparticles for the oxygen reduction reaction in fuel cell cathodes. Thorough understanding of core-shell formation is critical for atomic-scale design and control of the platinum shell, which is known to be the structural feature responsible for the enhancement. Here we reveal details of a counter-intuitive core-shell formation process in platinum-cobalt nanoparticles at elevated temperature under oxygen at atmospheric pressure, by using advanced in situ electron microscopy. Initial segregation of a thin platinum, rather than cobalt oxide, surface layer occurs concurrently with ordering of the intermetallic core, followed by the layer-by-layer growth of a platinum shell via Ostwald ripening during the oxygen annealing treatment. Calculations based on density functional theory demonstrate that this process follows an energetically favourable path. These findings are expected to be useful for the future design of structured platinum alloy nanocatalysts.Core-shell platinum alloy nanoparticles are promising catalysts for oxygen reduction, however a deeper understanding of core-shell formation is still required. Here the authors report oxygen-driven formation of core-shell Pt3Co nanoparticles, seen at the atomic scale with in situ electron microscopy at ambient pressure. |
| ArticleNumber | 204 |
| Author | Wu, Ruqian Zhang, Shuyi Pan, Xiaoqing Dai, Sheng Xu, Mingjie Xie, Lin You, Yuan Graham, George W. Cai, Wei |
| Author_xml | – sequence: 1 givenname: Sheng surname: Dai fullname: Dai, Sheng organization: Department of Chemical Engineering and Materials Science, University of California Irvine – sequence: 2 givenname: Yuan surname: You fullname: You, Yuan organization: Department of Physics and Astronomy, University of California Irvine, School of Physics and Electronics, Yancheng Teachers University – sequence: 3 givenname: Shuyi surname: Zhang fullname: Zhang, Shuyi organization: Department of Chemical Engineering and Materials Science, University of California Irvine, Department of Materials Science and Engineering, University of Michigan – sequence: 4 givenname: Wei surname: Cai fullname: Cai, Wei organization: Department of Materials Science and Engineering, University of Michigan – sequence: 5 givenname: Mingjie surname: Xu fullname: Xu, Mingjie organization: Department of Chemical Engineering and Materials Science, University of California Irvine, Department of Materials Science and Engineering, University of Michigan – sequence: 6 givenname: Lin surname: Xie fullname: Xie, Lin organization: Department of Chemical Engineering and Materials Science, University of California Irvine, National Laboratory of Solid State Microstructures and College of Engineering and Applied Sciences, Nanjing University – sequence: 7 givenname: Ruqian surname: Wu fullname: Wu, Ruqian organization: Department of Physics and Astronomy, University of California Irvine – sequence: 8 givenname: George W. surname: Graham fullname: Graham, George W. organization: Department of Chemical Engineering and Materials Science, University of California Irvine, Department of Materials Science and Engineering, University of Michigan – sequence: 9 givenname: Xiaoqing surname: Pan fullname: Pan, Xiaoqing email: xiaoqing.pan@uci.edu organization: Department of Chemical Engineering and Materials Science, University of California Irvine, Department of Physics and Astronomy, University of California Irvine |
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| Snippet | The catalytic performance of core-shell platinum alloy nanoparticles is typically superior to that of pure platinum nanoparticles for the oxygen reduction... Core-shell platinum alloy nanoparticles are promising catalysts for oxygen reduction, however a deeper understanding of core-shell formation is still required.... |
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| SubjectTerms | 639/301/299/893 639/301/357/354 639/301/930/12 Catalysis Cathodes Cell cathodes Chemical reduction Cobalt Cobalt oxides Density functional theory Electron microscopy Fuel cells Fuel technology High temperature Humanities and Social Sciences Microprocessors multidisciplinary Nanoparticles Nuclear fuels Ostwald ripening Oxygen Oxygen reduction reactions Platinum Platinum base alloys Science Science (multidisciplinary) Surface layers |
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| Title | In situ atomic-scale observation of oxygen-driven core-shell formation in Pt3Co nanoparticles |
| URI | https://link.springer.com/article/10.1038/s41467-017-00161-y https://www.proquest.com/docview/2084328023 https://search.proquest.com/docview/1927307927 https://pubmed.ncbi.nlm.nih.gov/PMC5547122 https://doaj.org/article/27a414aa2a8a4343af8c505c47af166c |
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