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Water Chemistry beneath Graphene : Condensation of a Dense OH-H2O Phase under Graphene

Grånäs, Elin LU ; Schröder, Ulrike A. ; Arman, Mohammad A. LU ; Andersen, Mie ; Gerber, Timm ; Schulte, Karina ; Andersen, Jesper N. LU ; Michely, Thomas ; Hammer, Bjørk and Knudsen, Jan LU (2022) In Journal of Physical Chemistry C 126(9). p.4347-4354
Abstract

Room temperature oxygen hydrogenation below graphene flakes supported by Ir(111) is investigated through a combination of X-ray photoelectron spectroscopy, scanning tunneling microscopy, and density functional theory calculations using an evolutionary search algorithm. We demonstrate how the graphene cover and its doping level can be used to trap and characterize dense mixed O-OH-H2O phases that otherwise would not exist. Our study of these graphene-stabilized phases and their response to oxygen or hydrogen exposure reveals that additional oxygen can be dissolved into them at room temperature creating mixed O-OH-H2O phases with an increased areal coverage underneath graphene. In contrast, additional hydrogen... (More)

Room temperature oxygen hydrogenation below graphene flakes supported by Ir(111) is investigated through a combination of X-ray photoelectron spectroscopy, scanning tunneling microscopy, and density functional theory calculations using an evolutionary search algorithm. We demonstrate how the graphene cover and its doping level can be used to trap and characterize dense mixed O-OH-H2O phases that otherwise would not exist. Our study of these graphene-stabilized phases and their response to oxygen or hydrogen exposure reveals that additional oxygen can be dissolved into them at room temperature creating mixed O-OH-H2O phases with an increased areal coverage underneath graphene. In contrast, additional hydrogen exposure converts the mixed O-OH-H2O phases back to pure OH-H2O with a reduced areal coverage underneath graphene.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
126
issue
9
pages
8 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:35299819
  • scopus:85125927917
ISSN
1932-7447
DOI
10.1021/acs.jpcc.1c10289
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2022 The Authors. Published by American Chemical Society.
id
48aa5c07-5137-4d58-bd06-8437fdbbcf7e
date added to LUP
2022-05-23 09:26:07
date last changed
2024-06-13 12:31:44
@article{48aa5c07-5137-4d58-bd06-8437fdbbcf7e,
  abstract     = {{<p>Room temperature oxygen hydrogenation below graphene flakes supported by Ir(111) is investigated through a combination of X-ray photoelectron spectroscopy, scanning tunneling microscopy, and density functional theory calculations using an evolutionary search algorithm. We demonstrate how the graphene cover and its doping level can be used to trap and characterize dense mixed O-OH-H<sub>2</sub>O phases that otherwise would not exist. Our study of these graphene-stabilized phases and their response to oxygen or hydrogen exposure reveals that additional oxygen can be dissolved into them at room temperature creating mixed O-OH-H<sub>2</sub>O phases with an increased areal coverage underneath graphene. In contrast, additional hydrogen exposure converts the mixed O-OH-H<sub>2</sub>O phases back to pure OH-H<sub>2</sub>O with a reduced areal coverage underneath graphene.</p>}},
  author       = {{Grånäs, Elin and Schröder, Ulrike A. and Arman, Mohammad A. and Andersen, Mie and Gerber, Timm and Schulte, Karina and Andersen, Jesper N. and Michely, Thomas and Hammer, Bjørk and Knudsen, Jan}},
  issn         = {{1932-7447}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{9}},
  pages        = {{4347--4354}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry C}},
  title        = {{Water Chemistry beneath Graphene : Condensation of a Dense OH-H<sub>2</sub>O Phase under Graphene}},
  url          = {{http://dx.doi.org/10.1021/acs.jpcc.1c10289}},
  doi          = {{10.1021/acs.jpcc.1c10289}},
  volume       = {{126}},
  year         = {{2022}},
}