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Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data

To reveal the origin of the CO oxidation activity of Ruthenium nanoparticles (Ru NPs), we structurally characterized Ru NPs through Rietveld refinement analysis of high-energy X-ray diffraction data. For hexagonal close-packed (hcp) Ru NPs, the CO oxidation activity decreased with decreasing domain...

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Autores principales: Song, Chulho, Sakata, Osami, Kumara, Loku Singgappulige Rosantha, Kohara, Shinji, Yang, Anli, Kusada, Kohei, Kobayashi, Hirokazu, Kitagawa, Hiroshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4979023/
https://www.ncbi.nlm.nih.gov/pubmed/27506187
http://dx.doi.org/10.1038/srep31400
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author Song, Chulho
Sakata, Osami
Kumara, Loku Singgappulige Rosantha
Kohara, Shinji
Yang, Anli
Kusada, Kohei
Kobayashi, Hirokazu
Kitagawa, Hiroshi
author_facet Song, Chulho
Sakata, Osami
Kumara, Loku Singgappulige Rosantha
Kohara, Shinji
Yang, Anli
Kusada, Kohei
Kobayashi, Hirokazu
Kitagawa, Hiroshi
author_sort Song, Chulho
collection PubMed
description To reveal the origin of the CO oxidation activity of Ruthenium nanoparticles (Ru NPs), we structurally characterized Ru NPs through Rietveld refinement analysis of high-energy X-ray diffraction data. For hexagonal close-packed (hcp) Ru NPs, the CO oxidation activity decreased with decreasing domain surface area. However, for face-centered cubic (fcc) Ru NPs, the CO oxidation activity became stronger with decreasing domain surface area. In comparing fcc Ru NPs with hcp Ru NPs, we found that the hcp Ru NPs of approximately 2 nm, which had a smaller domain surface area and smaller atomic displacement, showed a higher catalytic activity than that of fcc Ru NPs of the same size. In contrast, fcc Ru NPs larger than 3.5 nm, which had a larger domain surface area, lattice distortion, and larger atomic displacement, exhibited higher catalytic activity than that of hcp Ru NPs of the same size. In addition, the fcc Ru NPs had larger atomic displacements than hcp Ru NPs for diameters ranging from 2.2 to 5.4 nm. Enhancement of the CO oxidation activity in fcc Ru NPs may be caused by an increase in imperfections due to lattice distortions of close-packed planes and static atomic displacements.
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spelling pubmed-49790232016-08-19 Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data Song, Chulho Sakata, Osami Kumara, Loku Singgappulige Rosantha Kohara, Shinji Yang, Anli Kusada, Kohei Kobayashi, Hirokazu Kitagawa, Hiroshi Sci Rep Article To reveal the origin of the CO oxidation activity of Ruthenium nanoparticles (Ru NPs), we structurally characterized Ru NPs through Rietveld refinement analysis of high-energy X-ray diffraction data. For hexagonal close-packed (hcp) Ru NPs, the CO oxidation activity decreased with decreasing domain surface area. However, for face-centered cubic (fcc) Ru NPs, the CO oxidation activity became stronger with decreasing domain surface area. In comparing fcc Ru NPs with hcp Ru NPs, we found that the hcp Ru NPs of approximately 2 nm, which had a smaller domain surface area and smaller atomic displacement, showed a higher catalytic activity than that of fcc Ru NPs of the same size. In contrast, fcc Ru NPs larger than 3.5 nm, which had a larger domain surface area, lattice distortion, and larger atomic displacement, exhibited higher catalytic activity than that of hcp Ru NPs of the same size. In addition, the fcc Ru NPs had larger atomic displacements than hcp Ru NPs for diameters ranging from 2.2 to 5.4 nm. Enhancement of the CO oxidation activity in fcc Ru NPs may be caused by an increase in imperfections due to lattice distortions of close-packed planes and static atomic displacements. Nature Publishing Group 2016-08-10 /pmc/articles/PMC4979023/ /pubmed/27506187 http://dx.doi.org/10.1038/srep31400 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Song, Chulho
Sakata, Osami
Kumara, Loku Singgappulige Rosantha
Kohara, Shinji
Yang, Anli
Kusada, Kohei
Kobayashi, Hirokazu
Kitagawa, Hiroshi
Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data
title Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data
title_full Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data
title_fullStr Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data
title_full_unstemmed Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data
title_short Size dependence of structural parameters in fcc and hcp Ru nanoparticles, revealed by Rietveld refinement analysis of high-energy X-ray diffraction data
title_sort size dependence of structural parameters in fcc and hcp ru nanoparticles, revealed by rietveld refinement analysis of high-energy x-ray diffraction data
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4979023/
https://www.ncbi.nlm.nih.gov/pubmed/27506187
http://dx.doi.org/10.1038/srep31400
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