Universität zu Köln

Granaes, Elin, Schroeder, Ulrike A., Arman, Mohammad A., Andersen, Mie ORCID: 0000-0002-9943-1534, Gerber, Timm, Schulte, Karina, Andersen, Jesper N., Michely, Thomas ORCID: 0000-0003-1657-1847, Hammer, Bjork ORCID: 0000-0002-7849-6347 and Knudsen, Jan (2022). Water Chemistry beneath Graphene: Condensation of a Dense OH-H2O Phase under Graphene. J. Phys. Chem. C, 126 (9). S. 4347 - 4355. WASHINGTON: AMER CHEMICAL SOC. ISSN 1932-7455

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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 exposure converts the mixed O-OH-H2O phases back to pure OH-H2O with a reduced areal coverage underneath graphene.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Granaes, Elin UNSPECIFIED UNSPECIFIED UNSPECIFIED Schroeder, Ulrike A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Arman, Mohammad A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Andersen, Mie UNSPECIFIED orcid.org/0000-0002-9943-1534 UNSPECIFIED Gerber, Timm UNSPECIFIED UNSPECIFIED UNSPECIFIED Schulte, Karina UNSPECIFIED UNSPECIFIED UNSPECIFIED Andersen, Jesper N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Michely, Thomas UNSPECIFIED orcid.org/0000-0003-1657-1847 UNSPECIFIED Hammer, Bjork UNSPECIFIED orcid.org/0000-0002-7849-6347 UNSPECIFIED Knudsen, Jan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-681113
DOI:	10.1021/acs.jpcc.1c10289
Journal or Publication Title:	J. Phys. Chem. C
Volume:	126
Number:	9
Page Range:	S. 4347 - 4355
Date:	2022
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1932-7455
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language OXYGEN INTERCALATION; RU(0001); OXIDATION; CO; REACTIVITY; KINETICS; O-2 Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68111