Tuning the Activity of Pt(111) for Oxygen Electroreduction by Subsurface Alloying

Publication: Research - peer-reviewJournal article – Annual report year: 2011

View graph of relations

To enable the development of low temperature fuel cells, significant improvements are required to the efficiency of the Pt electrocatalysts at the cathode, where oxygen reduction takes place. Herein, we study the effect of subsurface solute metals on the reactivity of Pt, using a Cu/Pt(111) near-surface alloy. Our investigations incorporate electrochemical measurements, ultrahigh vacuum experiments, and density functional theory. Changes to the OH binding energy, ΔEOH, were monitored in situ and adjusted continuously through the subsurface Cu coverage. The incorporation of submonolayer quantities of Cu into Pt(111) resulted in an 8-fold improvement in oxygen reduction activity. The most optimal catalyst for oxygen reduction has an ΔEOH ≈ 0.1 eV weaker than that of pure Pt, validating earlier theoretical predictions.
Original languageEnglish
JournalAmerican Chemical Society. Journal
Publication date2011
Volume133
Issue14
Pages5485
ISSN0002-7863
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 78
Download as:
Download as PDF
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
PDF
Download as HTML
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
HTML
Download as Word
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
Word

ID: 5669211