Strain and ligand effects in Pt-Ni alloys studied by valence-to-core X-ray emission spectroscopy

Experimental detection of the Pt 5d densities of states in the valence band is conducted on a series of Pt-Ni alloys by high energy resolution valence-to-core X-ray emission spectroscopy (VTC-XES) at the Pt L(3)-edge. VTC-XES measurements reveal that the Pt d-band centroid shifts away from the Fermi...

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Autores principales: Chen, Jiatang, Finfrock, Y. Zou, Wang, Zhiqiang, Sham, Tsun-Kong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8249455/
https://www.ncbi.nlm.nih.gov/pubmed/34211031
http://dx.doi.org/10.1038/s41598-021-93068-0
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author Chen, Jiatang
Finfrock, Y. Zou
Wang, Zhiqiang
Sham, Tsun-Kong
author_facet Chen, Jiatang
Finfrock, Y. Zou
Wang, Zhiqiang
Sham, Tsun-Kong
author_sort Chen, Jiatang
collection PubMed
description Experimental detection of the Pt 5d densities of states in the valence band is conducted on a series of Pt-Ni alloys by high energy resolution valence-to-core X-ray emission spectroscopy (VTC-XES) at the Pt L(3)-edge. VTC-XES measurements reveal that the Pt d-band centroid shifts away from the Fermi level upon dilution, accompanied by concentration-dependent Pt d-band width. The competition between the strain effect and ligand effect is observed experimentally for the first time. It is found that the d-band widths in Pt(3)Ni and PtNi are broader than that of Pt metal due to compressive strain which overcompensates the effect of dilution, while it is narrower in PtNi(3) where the ligand effect dominates. VTC-XES is demonstrated to be a powerful tool to study the Pt d-band contribution to the valence band of Pt-based bimetallic. The implication for the enhanced activity of Pt-Ni catalysts in oxygen reduction reaction is discussed.
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spelling pubmed-82494552021-07-06 Strain and ligand effects in Pt-Ni alloys studied by valence-to-core X-ray emission spectroscopy Chen, Jiatang Finfrock, Y. Zou Wang, Zhiqiang Sham, Tsun-Kong Sci Rep Article Experimental detection of the Pt 5d densities of states in the valence band is conducted on a series of Pt-Ni alloys by high energy resolution valence-to-core X-ray emission spectroscopy (VTC-XES) at the Pt L(3)-edge. VTC-XES measurements reveal that the Pt d-band centroid shifts away from the Fermi level upon dilution, accompanied by concentration-dependent Pt d-band width. The competition between the strain effect and ligand effect is observed experimentally for the first time. It is found that the d-band widths in Pt(3)Ni and PtNi are broader than that of Pt metal due to compressive strain which overcompensates the effect of dilution, while it is narrower in PtNi(3) where the ligand effect dominates. VTC-XES is demonstrated to be a powerful tool to study the Pt d-band contribution to the valence band of Pt-based bimetallic. The implication for the enhanced activity of Pt-Ni catalysts in oxygen reduction reaction is discussed. Nature Publishing Group UK 2021-07-01 /pmc/articles/PMC8249455/ /pubmed/34211031 http://dx.doi.org/10.1038/s41598-021-93068-0 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Chen, Jiatang
Finfrock, Y. Zou
Wang, Zhiqiang
Sham, Tsun-Kong
Strain and ligand effects in Pt-Ni alloys studied by valence-to-core X-ray emission spectroscopy
title Strain and ligand effects in Pt-Ni alloys studied by valence-to-core X-ray emission spectroscopy
title_full Strain and ligand effects in Pt-Ni alloys studied by valence-to-core X-ray emission spectroscopy
title_fullStr Strain and ligand effects in Pt-Ni alloys studied by valence-to-core X-ray emission spectroscopy
title_full_unstemmed Strain and ligand effects in Pt-Ni alloys studied by valence-to-core X-ray emission spectroscopy
title_short Strain and ligand effects in Pt-Ni alloys studied by valence-to-core X-ray emission spectroscopy
title_sort strain and ligand effects in pt-ni alloys studied by valence-to-core x-ray emission spectroscopy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8249455/
https://www.ncbi.nlm.nih.gov/pubmed/34211031
http://dx.doi.org/10.1038/s41598-021-93068-0
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AT wangzhiqiang strainandligandeffectsinptnialloysstudiedbyvalencetocorexrayemissionspectroscopy
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