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

Ifan Stephens, A.S. Bondarenko, F.J. Perez-Alonso, Federico Calle Vallejo, Lone Bech, Tobias Peter Johansson, A.K. Jepsen, R. Frydendal, Brian Peter Knudsen, Jan Rossmeisl, Ib Chorkendorff

Research output: Contribution to journalJournal articleResearchpeer-review


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
JournalJournal of the American Chemical Society
Issue number14
Pages (from-to)5485
Publication statusPublished - 2011


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