Methanol oxidation on Pt(111)/Ru in alkaline media

Jacob S. Spendelow, Jason D. Goodpaster, Christina M. Johnston, Paul J A Kenis, Andrzej Wieckowski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Dehydrogenation and oxidation of methanol has been studied on well-ordered Pt(111), vicinal Pt(111), and Pt(111)/Ru in alkaline media. Multiple mechanisms of promotion have been identified. Steps with (110) orientation promote methanol dehydrogenation through a geometric effect, while they promote CO oxidation through a change in electronic structure. Adsorbed Ru promotes methanol dehydrogenation through two distinct electronic (ligand) effects: it increases the intrinsic activity of nearby R sites for methanol dehydrogenation, and it decreases the local CO coverage at the active sites even when the overall CO coverage is high. Ru also promotes methanol oxidation through a ligand effect on CO oxidation. The bifunctional effect of Ru is concluded to be much weaker in alkaline media than in acidic media. STM imaging confirms the stability of adsorbed Ru even during extended potential cycling and oxidizing treatments, demonstrating the promising characteristics of Pt/Ru surfaces for fuel cells.

Original languageEnglish (US)
Title of host publicationECS Transactions - 7th Symposium Devoted to Proton Exchange Membrane Fuel Cells
Pages1333-1346
Number of pages14
Edition1 PART 2
DOIs
StatePublished - 2007
Event7th Symposium Devoted to Proton Exchange Membrane Fuel Cells - 212th ECS Meeting - Washington, DC, United States
Duration: Oct 7 2007Oct 12 2007

Publication series

NameECS Transactions
Number1 PART 2
Volume11
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other7th Symposium Devoted to Proton Exchange Membrane Fuel Cells - 212th ECS Meeting
CountryUnited States
CityWashington, DC
Period10/7/0710/12/07

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