Mass-selected nanoparticles of PtxY as model catalysts for oxygen electroreduction

Patricia Hernandez-Fernandez, Federico Masini, David Norman McCarthy, Christian Ejersbo Strebel, Daniel Friebel, Davide Deiana, Paolo Malacrida, Anders Ulrik Fregerslev Nierhoff, Anders Bodin, Anna M. Wise, Jane Hvolbæk Nielsen, Thomas Willum Hansen, Anders Nilsson, Ifan Stephens, Ib Chorkendorff

Research output: Contribution to journalJournal articleResearchpeer-review


Low-temperature fuel cells are limited by the oxygen reduction reaction, and their widespread implementation in automotive vehicles is hindered by the cost of platinum, currently the best-known catalyst for reducing oxygen in terms of both activity and stability. One solution is to decrease the amount of platinum required, for example by alloying, but without detrimentally affecting its properties. The alloy PtxY is known to be active and stable, but its synthesis in nanoparticulate form has proved challenging, which limits its further study. Herein we demonstrate the synthesis, characterization and catalyst testing of model PtxY nanoparticles prepared through the gas-aggregation technique. The catalysts reported here are highly active, with a mass activity of up to 3.05 A mgPt-1 at 0.9 V versus a reversible hydrogen electrode. Using a variety of characterization techniques, we show that the enhanced activity of PtxY over elemental platinum results exclusively from a compressive strain exerted on the platinum surface atoms by the alloy core.
Original languageEnglish
JournalNature Chemistry
Issue number8
Pages (from-to)732-738
Number of pages7
Publication statusPublished - 2014


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