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Topics in Catalysis
Published in: Topics in Catalysis 6-7/2017

12-09-2016 | Original Paper

Comparative Analysis of Cobalt Oxide Nanoisland Stability and Edge Structures on Three Related Noble Metal Surfaces: Au(111), Pt(111) and Ag(111)

Authors: Jakob Fester, Michal Bajdich, Alex S. Walton, Z. Sun, Philipp N. Plessow, Aleksandra Vojvodic, Jeppe V. Lauritsen

Published in: Topics in Catalysis | Issue 6-7/2017

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Abstract

Metal oxide nanostructures and thin films grown on metallic substrates have attracted strong attention as model catalysts and as interesting inverse catalyst systems in their own right. In this study, we investigate the role of metal support in the growth and stabilization of cobalt oxide nanostructures on the three related (111) surfaces of Au, Pt and Ag, as investigated by means of high-resolution scanning tunneling microscopy and DFT calculations. All three substrates promote the growth of crystalline CoOx (x = 1−2) islands under oxidative conditions, but we find several noteworthy differences in the occurrence and stabilization of four distinct cobalt oxide island phases: Co–O bilayers, O–Co–O trilayers, Co–O–Co–O double bilayers and O–Co–O–Co–O multilayers. Using atom-resolved images combined with analysis of defect lines in bilayer islands on Au and Pt, we furthermore unambiguously determine the edge structure. Interestingly, the island shape and abundances of edge types in bilayers change radically from mixed Co/O edge terminations on Au(111) to a predominance of Co terminated edges (~91 %) on Pt(111) which is especially interesting since the Co metal edges are expected to host the most active sites for water dissociation.
previous article Fe Oxides on Ag Surfaces: Structure and Reactivity
next article Cerium Oxide Epitaxial Nanostructures on Pt(111): Growth, Morphology and Structure

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Appendix
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Metadata
Title
Comparative Analysis of Cobalt Oxide Nanoisland Stability and Edge Structures on Three Related Noble Metal Surfaces: Au(111), Pt(111) and Ag(111)
Authors
Jakob Fester
Michal Bajdich
Alex S. Walton
Z. Sun
Philipp N. Plessow
Aleksandra Vojvodic
Jeppe V. Lauritsen
Publication date
12-09-2016
Publisher
Springer US
Published in
Topics in Catalysis / Issue 6-7/2017
Print ISSN: 1022-5528
Electronic ISSN: 1572-9028
DOI
https://doi.org/10.1007/s11244-016-0708-6

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