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

Abstract 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 L3-edge. VTC-XES measurements reveal that the Pt d-band centroid shifts away from th...

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Autores principales:	Jiatang Chen, Y. Zou Finfrock, Zhiqiang Wang, Tsun-Kong Sham
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/997405a4c51245259d3b6ff756e5ec2e
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spelling	oai:doaj.org-article:997405a4c51245259d3b6ff756e5ec2e2021-12-02T16:10:24ZStrain and ligand effects in Pt-Ni alloys studied by valence-to-core X-ray emission spectroscopy10.1038/s41598-021-93068-02045-2322https://doaj.org/article/997405a4c51245259d3b6ff756e5ec2e2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93068-0https://doaj.org/toc/2045-2322Abstract 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 L3-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 Pt3Ni and PtNi are broader than that of Pt metal due to compressive strain which overcompensates the effect of dilution, while it is narrower in PtNi3 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.Jiatang ChenY. Zou FinfrockZhiqiang WangTsun-Kong ShamNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jiatang Chen Y. Zou Finfrock Zhiqiang Wang Tsun-Kong Sham Strain and ligand effects in Pt-Ni alloys studied by valence-to-core X-ray emission spectroscopy
description	Abstract 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 L3-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 Pt3Ni and PtNi are broader than that of Pt metal due to compressive strain which overcompensates the effect of dilution, while it is narrower in PtNi3 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.
format	article
author	Jiatang Chen Y. Zou Finfrock Zhiqiang Wang Tsun-Kong Sham
author_facet	Jiatang Chen Y. Zou Finfrock Zhiqiang Wang Tsun-Kong Sham
author_sort	Jiatang Chen
title	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_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_sort	strain and ligand effects in pt-ni alloys studied by valence-to-core x-ray emission spectroscopy
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/997405a4c51245259d3b6ff756e5ec2e
work_keys_str_mv	AT jiatangchen strainandligandeffectsinptnialloysstudiedbyvalencetocorexrayemissionspectroscopy AT yzoufinfrock strainandligandeffectsinptnialloysstudiedbyvalencetocorexrayemissionspectroscopy AT zhiqiangwang strainandligandeffectsinptnialloysstudiedbyvalencetocorexrayemissionspectroscopy AT tsunkongsham strainandligandeffectsinptnialloysstudiedbyvalencetocorexrayemissionspectroscopy
_version_	1718384426007658496

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

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