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  4. Heterogeneous adsorption and local ordering of formate on a magnetite surface
 
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Heterogeneous adsorption and local ordering of formate on a magnetite surface

Citation Link: https://doi.org/10.15480/882.3465
Publikationstyp
Journal Article
Date Issued
2021-04-22
Sprache
English
Author(s)
Creutzburg, Marcus  
Sellschopp, Kai  orcid-logo
Tober, Steffen  
Grånäs, Elin  
Vonk, Vedran  
Mayr-Schmölzer, Wernfried 
Müller, Stefan  
Noei, Heshmat  
Vonbun-Feldbauer, Gregor  orcid-logo
Stierle, Andreas  
Institut
Keramische Hochleistungswerkstoffe M-9  
TORE-DOI
10.15480/882.3465
TORE-URI
http://hdl.handle.net/11420/9343
Journal
Journal of physical chemistry letters  
Volume
12
Start Page
3847
End Page
3852
Citation
The Journal of Physical Chemistry Letters 12: 3847-3852 (2021-04-22)
Publisher DOI
10.1021/acs.jpclett.1c00209
Scopus ID
2-s2.0-85105088228
We report a novel heterogeneous adsorption mechanism of formic acid on the magnetite (111) surface. Our experimental results and density functional theory (DFT) calculations give evidence for dissociative adsorption of formic acid in quasibidentate and chelating geometries. The latter is induced by the presence of iron vacancies at the surface, making oxygen atoms accessible for hydrogen atoms from dissociated formic acid. DFT calculations predict that both adsorption geometries are energetically favorable under our experimental conditions. The calculations prove that the locally observed (√3 × √3)R 30° superstructure consists of three formate molecules in a triangular arrangement, adsorbed predominantly in a chelating geometry. The results show how defects can stabilize alternative adsorption geometries, which is a crucial ingredient for a detailed atomistic understanding of reaction barriers on magnetite and other oxide surfaces, as well as for the
stability of carboxylic acid based nanocomposite materials.
DDC Class
540: Chemie
620: Ingenieurwissenschaften
Funding(s)
SFB 986: Teilprojekt A4 - Ab-initio basierende Modellierung und Beeinflussung der mechanischen Eigenschaften von Hybridgrenzflächen  
Publication version
publishedVersion
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
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