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

Research output: Research - peer-reviewJournal article

  • Jakob Fester
  • Michal Bajdich
    Michal BajdichSLAC National Accelerator Laboratory
  • Alexander Walton
    Alexander WaltonUniversity of Manchester
  • Zhaozong Sun
  • Philipp N. Plessow
    Philipp N. PlessowSLAC National Accelerator LaboratoryUnited States
  • Aleksandra Vojvodic
    Aleksandra VojvodicSLAC National Accelerator LaboratoryDenmark
  • Jeppe V. Lauritsen
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.
Original languageEnglish
JournalTopics in Catalysis
Volume60
Issue number6-7
Pages (from-to)503–512
Number of pages10
ISSN1022-5528
StatePublished - May 2017

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