Atomic-Scale View of the Oxidation and Reduction of Supported Ultrathin FeO Islands

Yijia Li; Kræn C. Adamsen; Lutz Lammich; Jeppe V. Lauritsen; Stefan Wendt

doi:10.1021/acsnano.9b05470

Atomic-Scale View of the Oxidation and Reduction of Supported Ultrathin FeO Islands

Yijia Li, Kræn C. Adamsen, Lutz Lammich, Jeppe V. Lauritsen, Stefan Wendt^*

^*Corresponding author for this work

Interdisciplinary Nanoscience Center - INANO-Fysik, iNANO-huset

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

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Abstract

By means of scanning tunneling microscopy (STM) measurements, we studied in situ the oxidation and reduction of FeO bilayer islands on Au(111) by oxygen (O₂) and hydrogen (H₂), respectively. The FeO islands respond very dynamically toward O₂, with the coordinatively unsaturated ferrous (CUF) sites at the island edges being essential for O₂ dissociation and O atom incorporation. An STM movie obtained during oxidation reveals how further O₂ molecules can dissociate after the consumption of all initially existing CUF sites through the formation of new CUF sites. In contrast, we found that H₂ molecules only dissociate when vibrationally excited through the ion gauge and only at the basal plane of FeO islands, implying that the CUF sites are not relevant for H₂ dissociation. Our STM results reveal how excess O atoms are incorporated and released in O₂ and H₂ and thus shed light onto the stability of inverse catalysts during a catalyzed reaction.

Original language	English
Journal	ACS Nano
Volume	13
Issue	10
Pages (from-to)	11632-11641
Number of pages	10
ISSN	1936-0851
DOIs	https://doi.org/10.1021/acsnano.9b05470
Publication status	Published - Oct 2019

Keywords

catalysis
dissociation
H
iron oxide
O adatom dislocation lines
O
STM movies

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10.1021/acsnano.9b05470

Li_et al_FeO_Au

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@article{d52b1d3168c54334b8e352c4d97a864c,

title = "Atomic-Scale View of the Oxidation and Reduction of Supported Ultrathin FeO Islands",

abstract = "By means of scanning tunneling microscopy (STM) measurements, we studied in situ the oxidation and reduction of FeO bilayer islands on Au(111) by oxygen (O2) and hydrogen (H2), respectively. The FeO islands respond very dynamically toward O2, with the coordinatively unsaturated ferrous (CUF) sites at the island edges being essential for O2 dissociation and O atom incorporation. An STM movie obtained during oxidation reveals how further O2 molecules can dissociate after the consumption of all initially existing CUF sites through the formation of new CUF sites. In contrast, we found that H2 molecules only dissociate when vibrationally excited through the ion gauge and only at the basal plane of FeO islands, implying that the CUF sites are not relevant for H2 dissociation. Our STM results reveal how excess O atoms are incorporated and released in O2 and H2 and thus shed light onto the stability of inverse catalysts during a catalyzed reaction.",

keywords = "catalysis, dissociation, H, iron oxide, O adatom dislocation lines, O, STM movies",

author = "Yijia Li and Adamsen, {Kr{\ae}n C.} and Lutz Lammich and Lauritsen, {Jeppe V.} and Stefan Wendt",

year = "2019",

month = oct,

doi = "10.1021/acsnano.9b05470",

language = "English",

volume = "13",

pages = "11632--11641",

journal = "ACS Nano",

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T1 - Atomic-Scale View of the Oxidation and Reduction of Supported Ultrathin FeO Islands

AU - Li, Yijia

AU - Adamsen, Kræn C.

AU - Lammich, Lutz

AU - Lauritsen, Jeppe V.

AU - Wendt, Stefan

PY - 2019/10

Y1 - 2019/10

N2 - By means of scanning tunneling microscopy (STM) measurements, we studied in situ the oxidation and reduction of FeO bilayer islands on Au(111) by oxygen (O2) and hydrogen (H2), respectively. The FeO islands respond very dynamically toward O2, with the coordinatively unsaturated ferrous (CUF) sites at the island edges being essential for O2 dissociation and O atom incorporation. An STM movie obtained during oxidation reveals how further O2 molecules can dissociate after the consumption of all initially existing CUF sites through the formation of new CUF sites. In contrast, we found that H2 molecules only dissociate when vibrationally excited through the ion gauge and only at the basal plane of FeO islands, implying that the CUF sites are not relevant for H2 dissociation. Our STM results reveal how excess O atoms are incorporated and released in O2 and H2 and thus shed light onto the stability of inverse catalysts during a catalyzed reaction.

AB - By means of scanning tunneling microscopy (STM) measurements, we studied in situ the oxidation and reduction of FeO bilayer islands on Au(111) by oxygen (O2) and hydrogen (H2), respectively. The FeO islands respond very dynamically toward O2, with the coordinatively unsaturated ferrous (CUF) sites at the island edges being essential for O2 dissociation and O atom incorporation. An STM movie obtained during oxidation reveals how further O2 molecules can dissociate after the consumption of all initially existing CUF sites through the formation of new CUF sites. In contrast, we found that H2 molecules only dissociate when vibrationally excited through the ion gauge and only at the basal plane of FeO islands, implying that the CUF sites are not relevant for H2 dissociation. Our STM results reveal how excess O atoms are incorporated and released in O2 and H2 and thus shed light onto the stability of inverse catalysts during a catalyzed reaction.

KW - catalysis

KW - dissociation

KW - H

KW - iron oxide

KW - O adatom dislocation lines

KW - O

KW - STM movies

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EP - 11641

JO - ACS Nano

JF - ACS Nano

IS - 10

ER -

Atomic-Scale View of the Oxidation and Reduction of Supported Ultrathin FeO Islands

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Keywords

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