Search: onr:"swepub:oai:DiVA.org:kth-261961" >
Interaction of Atom...
Interaction of Atomic Hydrogen with the Cu2O(100) and (111) Surfaces
-
- Tissot, Heloise (author)
- KTH,Material- och nanofysik
-
- Wang, Chunlei (author)
- KTH,Material- och nanofysik
-
- Halldin Stenlid, Joakim (author)
- Stockholms universitet,Fysikum
-
show more...
-
- Panahi, Mohammad (author)
- Koc Univ, TUPRAS Energy Ctr KUTEM, TR-34450 Istanbul, Turkey.;Koc Univ, Chem Dept, TR-34450 Istanbul, Turkey.
-
- Kaya, Sarp (author)
- Koc Univ, TUPRAS Energy Ctr KUTEM, TR-34450 Istanbul, Turkey.;Koc Univ, Chem Dept, TR-34450 Istanbul, Turkey.
-
- Soldemo, Markus (author)
- KTH,Material- och nanofysik
-
- Ghadami Yazdi, Milad (author)
- KTH,Material- och nanofysik
-
- Brinck, Tore, 1965- (author)
- KTH,Tillämpad fysikalisk kemi
-
- Weissenrieder, Jonas (author)
- KTH,Material- och nanofysik
-
show less...
-
(creator_code:org_t)
- 2019-08-16
- 2019
- English.
-
In: The Journal of Physical Chemistry C. - : AMER CHEMICAL SOC. - 1932-7447 .- 1932-7455. ; 123:36, s. 22172-22180
- Related links:
-
https://urn.kb.se/re...
-
show more...
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
show less...
Abstract
Subject headings
Close
- Reduction of Cu2O by hydrogen is a common preparation step for heterogeneous catalysts; however, a detailed understanding of the atomic reaction pathways is still lacking. Here, we investigate the interaction of atomic hydrogen with the Cu2O(100):(3,0;1,1) and Cu2O(111):(root 3 x root 3)R30 degrees surfaces using scanning tunneling microscopy (STM), low-energy electron diffraction, temperature-programmed desorption (TPD), and X-ray photoelectron spectroscopy (XPS). The experimental results are compared to density functional theory simulations. At 300 K, we identify the most favorable adsorption site on the Cu2O(100) surface: hydrogen atoms bind to an oxygen site located at the base of the atomic rows intrinsic to the (3,0;1,1) surface. The resulting hydroxyl group subsequently migrates to a nearby Cu trimer site. TPD analysis identifies H-2 as the principal desorption product. These observations imply that H-2 is formed through a disproportionation reaction of surface hydroxyl groups. The interaction of H with the (111) surface is more complex, including coordination to both Cu+ and O-CUS sites. STM and XPS analyses reveal the formation of metallic copper clusters on the Cu2O surfaces after cycles of hydrogen exposure and annealing. The interaction of the Cu clusters with the substrate is notably different for the two surface terminations studied: after annealing, the Cu clusters coalesce on the (100) termination, and the (3,0;1,1) reconstruction is partially recovered. Clusters formed on the (111) surface are less prone to coalescence, and the (root 3 x root 3)R30 degrees reconstruction was not recovered by heat treatment, indicating a weaker Cu cluster to support interaction on the (100) surface.
Subject headings
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
-
Tissot, Heloise
-
Wang, Chunlei
-
Halldin Stenlid, ...
-
Panahi, Mohammad
-
Kaya, Sarp
-
Soldemo, Markus
-
show more...
-
Ghadami Yazdi, M ...
-
Brinck, Tore, 19 ...
-
Weissenrieder, J ...
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Chemical Science ...
-
and Physical Chemist ...
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Chemical Science ...
- Articles in the publication
-
The Journal of P ...
- By the university
-
Royal Institute of Technology
-
Stockholm University