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Spectromicroscopic determinations of chemical environments of Ni in MoS2-Ag-Ni ternary systems

Talebi, Parisa ; Rani, Ekta ; Niu, Yuran LU ; Zakharov, Alexei LU and Cao, Wei (2023) In X-Ray Spectrometry 52(1). p.38-45
Abstract

Using heterogeneous photocatalysts for harvesting sunlight and converting it for water remediation and splitting are promising to mitigate the possible crisis of environment and energy. Among various composites, the MoS2-based heterostructures and Ni-based systems exhibit unique electronic, optical properties and redox capabilities, enabling their roles as photocatalysts. Herein, the impacts of chemical environments on the Ni electronic structures within the MoS2-Ag-Ni ternary systems are studied via X-ray photoemission electron spectroscopy (X-PEEM). Ni nanoparticles with two different sizes of 70 and 200 nm were loaded to MoS2 flakes with silver buffers as bridges. Heterostructures with a nominal mol... (More)

Using heterogeneous photocatalysts for harvesting sunlight and converting it for water remediation and splitting are promising to mitigate the possible crisis of environment and energy. Among various composites, the MoS2-based heterostructures and Ni-based systems exhibit unique electronic, optical properties and redox capabilities, enabling their roles as photocatalysts. Herein, the impacts of chemical environments on the Ni electronic structures within the MoS2-Ag-Ni ternary systems are studied via X-ray photoemission electron spectroscopy (X-PEEM). Ni nanoparticles with two different sizes of 70 and 200 nm were loaded to MoS2 flakes with silver buffers as bridges. Heterostructures with a nominal mol percentage of (MoS2)77Ag3.7Ni19.3 were synthesized through an ultrasound-assisted wet method. The oxidation states and various interfacial interactions of Ni with MoS2 in MoS2-Ag-Ni ternary composite are spectromicroscopically determined, combining the X-ray absorption spectroscopy near Ni L-edges and the imaging capability of the X-PEEM. Results showed that Ni mainly retrains its chemical states of metal and native oxidizations without observable electronic features subjected to bonding with the sulfur from the MoS2 flakes. The charge migration channel set up by the Ag buffer thus contributes to electron–hole migrations that facilitate the photocatalytic performance of the ternary system eventually.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
electronic structure, L-edge X-ray absorption, MoS-Ag-Ni ternary system, X-PEEM
in
X-Ray Spectrometry
volume
52
issue
1
pages
8 pages
publisher
John Wiley & Sons Inc.
external identifiers
  • scopus:85143213153
ISSN
0049-8246
DOI
10.1002/xrs.3314
language
English
LU publication?
yes
id
9fa80d53-f12b-43f4-bfd9-9ec528177dba
date added to LUP
2023-01-30 14:25:31
date last changed
2025-04-04 14:19:44
@article{9fa80d53-f12b-43f4-bfd9-9ec528177dba,
  abstract     = {{<p>Using heterogeneous photocatalysts for harvesting sunlight and converting it for water remediation and splitting are promising to mitigate the possible crisis of environment and energy. Among various composites, the MoS<sub>2</sub>-based heterostructures and Ni-based systems exhibit unique electronic, optical properties and redox capabilities, enabling their roles as photocatalysts. Herein, the impacts of chemical environments on the Ni electronic structures within the MoS<sub>2</sub>-Ag-Ni ternary systems are studied via X-ray photoemission electron spectroscopy (X-PEEM). Ni nanoparticles with two different sizes of 70 and 200 nm were loaded to MoS<sub>2</sub> flakes with silver buffers as bridges. Heterostructures with a nominal mol percentage of (MoS<sub>2</sub>)<sub>77</sub>Ag<sub>3.7</sub>Ni<sub>19.3</sub> were synthesized through an ultrasound-assisted wet method. The oxidation states and various interfacial interactions of Ni with MoS<sub>2</sub> in MoS<sub>2</sub>-Ag-Ni ternary composite are spectromicroscopically determined, combining the X-ray absorption spectroscopy near Ni L-edges and the imaging capability of the X-PEEM. Results showed that Ni mainly retrains its chemical states of metal and native oxidizations without observable electronic features subjected to bonding with the sulfur from the MoS<sub>2</sub> flakes. The charge migration channel set up by the Ag buffer thus contributes to electron–hole migrations that facilitate the photocatalytic performance of the ternary system eventually.</p>}},
  author       = {{Talebi, Parisa and Rani, Ekta and Niu, Yuran and Zakharov, Alexei and Cao, Wei}},
  issn         = {{0049-8246}},
  keywords     = {{electronic structure; L-edge X-ray absorption; MoS-Ag-Ni ternary system; X-PEEM}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{38--45}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{X-Ray Spectrometry}},
  title        = {{Spectromicroscopic determinations of chemical environments of Ni in MoS<sub>2</sub>-Ag-Ni ternary systems}},
  url          = {{http://dx.doi.org/10.1002/xrs.3314}},
  doi          = {{10.1002/xrs.3314}},
  volume       = {{52}},
  year         = {{2023}},
}