Adsorption and Activation of CO on Co3O4(111) Thin Films

Journal article
(Original article)


Publication Details

Author(s): Ferstl P, Mehl S, Arman MA, Schuler M, Toghan A, Laszlo B, Lykhach Y, Brummel O, Lundgren E, Knudsen J, Hammer L, Schneider MA, Libuda J
Journal: Journal of Physical Chemistry C
Publisher: American Chemical Society
Publication year: 2015
Volume: 119
Journal issue: 29
Pages range: 16688-16699
ISSN: 1932-7447
eISSN: 1932-7455
Language: English


Abstract


To explore the catalytic properties of cobalt oxide at the atomic level, we have studied the interaction of CO and O2 with well-ordered Co3O4(111) thin films using scanning tunneling microscopy (STM), high-resolution X-ray photoelectron spectroscopy (HR-XPS), infrared reflection absorption spectroscopy (IRAS), and temperature-programmed desorption spectroscopy (TPD) under ultrahigh vacuum (UHV) conditions. At low coverage and temperature, CO binds to surface Co2+ ions on the (111) facets. At larger exposure, a compressed phase is formed in which additional CO is located at sites in between the Co2+ ions. In addition, a bridging carbonate species forms that is associated with defects such as step edges of Co3O4(111) terraces or the side facets of the (111) oriented grains. Preadsorbed oxygen neither affects CO adsorption at low coverage nor the formation of the surface carbonate, but it blocks formation of the high coverage CO phase. Desorption of the molecularly bound CO occurs up to 180 K, whereas the surface carbonate decomposes in a broad temperature range up to 400 K under the release of CO and, to a lesser extent, of CO2. Upon strong loss of crystalline oxygen, the Co3O4 grains eventually switch to the CoO rocksalt structure.



FAU Authors / FAU Editors

Brummel, Olaf Dr.
Lehrstuhl für Physikalische Chemie II
Ferstl, Pascal
Professur für Experimentalphysik
Hammer, Lutz Dr.
Lehrstuhl für Festkörperphysik
Libuda, Jörg Prof. Dr.
Professur für Physikalische Chemie
Lykhach, Yaroslava
Lehrstuhl für Physikalische Chemie II
Mehl, Sascha
Lehrstuhl für Physikalische Chemie II
Schneider, M. Alexander Prof. Dr.
Professur für Experimentalphysik
Schuler, Marina
Lehrstuhl für Festkörperphysik


Additional Organisation
Exzellenz-Cluster Engineering of Advanced Materials


External institutions
Lund University / Lunds universitet
University of Szeged / József Attila Tudományegyetem Szeged


How to cite

APA:
Ferstl, P., Mehl, S., Arman, M.A., Schuler, M., Toghan, A., Laszlo, B.,... Libuda, J. (2015). Adsorption and Activation of CO on Co3O4(111) Thin Films. Journal of Physical Chemistry C, 119(29), 16688-16699. https://dx.doi.org/10.1021/acs.jpcc.5b04145

MLA:
Ferstl, Pascal, et al. "Adsorption and Activation of CO on Co3O4(111) Thin Films." Journal of Physical Chemistry C 119.29 (2015): 16688-16699.

BibTeX: 

Last updated on 2019-24-05 at 09:49