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Insights into the surface of mesoporous nickel oxide and its interaction with oxygen and water

Wrede, Sina ; Liu, Qianhui ; Chen, Libo ; D’Amario, Luca ; Cai, Bin ; Scardamaglia, Mattia LU ; Zhang, Zhi Bin ; Hahlin, Maria and Tian, Haining (2025) In Physical Chemistry Chemical Physics 27(24). p.12762-12773
Abstract

The surface chemistry of mesoporous nickel oxide (NiOx) plays a pivotal role in its functionality across various technological applications. Herein, we present a detailed study of NiOx surface states using multiple spectroscopic techniques, including ambient pressure X-ray photoelectron spectroscopy (XPS), ultraviolet-visible (UV-vis) spectroscopy, and Fourier-transform infrared (FTIR) spectroscopy, to observe the removal and reformation of surface species during gas dosing. Our findings reveal the presence of both surface oxygen- and hydroxide-species on the NiOx surface. Furthermore, the results suggest that NiOx surface states consist of approximately 50% hydroxides and the remainder... (More)

The surface chemistry of mesoporous nickel oxide (NiOx) plays a pivotal role in its functionality across various technological applications. Herein, we present a detailed study of NiOx surface states using multiple spectroscopic techniques, including ambient pressure X-ray photoelectron spectroscopy (XPS), ultraviolet-visible (UV-vis) spectroscopy, and Fourier-transform infrared (FTIR) spectroscopy, to observe the removal and reformation of surface species during gas dosing. Our findings reveal the presence of both surface oxygen- and hydroxide-species on the NiOx surface. Furthermore, the results suggest that NiOx surface states consist of approximately 50% hydroxides and the remainder comprising adsorbed oxygen species, likely predominantly diatomic oxygen ions (O2−), that are associated with higher valence Ni states (Ni3+). In situ experiments demonstrate that the formation and stability of hydroxides and diatomic oxygen ions depend on temperature and are significantly influenced by interactions with atmospheric oxygen and water. Our insights into the NiOx surface state composition and reactivity offer a nuanced understanding of its surface chemistry, with implications for enhancing its performance in catalysis, sensing, energy harvesting and energy storage devices where the surface states of nickel oxide are known to dictate electronic and chemical properties of the material.

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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Chemistry Chemical Physics
volume
27
issue
24
pages
12 pages
publisher
Royal Society of Chemistry
external identifiers
  • pmid:40462661
  • scopus:105007508920
ISSN
1463-9076
DOI
10.1039/d5cp00137d
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 The Royal Society of Chemistry.
id
2a63ac13-455f-446d-859c-1f4154533d24
date added to LUP
2025-12-22 13:34:50
date last changed
2025-12-22 13:35:57
@article{2a63ac13-455f-446d-859c-1f4154533d24,
  abstract     = {{<p>The surface chemistry of mesoporous nickel oxide (NiO<sub>x</sub>) plays a pivotal role in its functionality across various technological applications. Herein, we present a detailed study of NiO<sub>x</sub> surface states using multiple spectroscopic techniques, including ambient pressure X-ray photoelectron spectroscopy (XPS), ultraviolet-visible (UV-vis) spectroscopy, and Fourier-transform infrared (FTIR) spectroscopy, to observe the removal and reformation of surface species during gas dosing. Our findings reveal the presence of both surface oxygen- and hydroxide-species on the NiO<sub>x</sub> surface. Furthermore, the results suggest that NiO<sub>x</sub> surface states consist of approximately 50% hydroxides and the remainder comprising adsorbed oxygen species, likely predominantly diatomic oxygen ions (O<sub>2</sub><sup>−</sup>), that are associated with higher valence Ni states (Ni<sup>3+</sup>). In situ experiments demonstrate that the formation and stability of hydroxides and diatomic oxygen ions depend on temperature and are significantly influenced by interactions with atmospheric oxygen and water. Our insights into the NiO<sub>x</sub> surface state composition and reactivity offer a nuanced understanding of its surface chemistry, with implications for enhancing its performance in catalysis, sensing, energy harvesting and energy storage devices where the surface states of nickel oxide are known to dictate electronic and chemical properties of the material.</p>}},
  author       = {{Wrede, Sina and Liu, Qianhui and Chen, Libo and D’Amario, Luca and Cai, Bin and Scardamaglia, Mattia and Zhang, Zhi Bin and Hahlin, Maria and Tian, Haining}},
  issn         = {{1463-9076}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{24}},
  pages        = {{12762--12773}},
  publisher    = {{Royal Society of Chemistry}},
  series       = {{Physical Chemistry Chemical Physics}},
  title        = {{Insights into the surface of mesoporous nickel oxide and its interaction with oxygen and water}},
  url          = {{http://dx.doi.org/10.1039/d5cp00137d}},
  doi          = {{10.1039/d5cp00137d}},
  volume       = {{27}},
  year         = {{2025}},
}