Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 12, Pages 4234-4243Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta14574c
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Funding
- EU PF7's initiative Fuel Cell and Hydrogen Joint Undertaking's project CathCat [GA 303492]
- Danish National Research Foundation's Center for Individual Nanoparticle Functionality [DNRF54]
- Danish Ministry of Science's UNIK initiative CAtalysis for Sustainable Energy (CASE)
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Three different Pt-lanthanide metal alloys (Pt5La, Pt5Ce and Pt3La) have been studied as oxygen reduction reaction (ORR) electrocatalysts. Sputter-cleaned polycrystalline Pt5La and Pt5Ce exhibit more than a 3-fold activity enhancement compared to polycrystalline Pt at 0.9 V, while Pt3La heavily corrodes in 0.1 M HClO4 electrolyte. Angle Resolved X-ray Photoelectron Spectroscopy (AR-XPS) and Low Energy Ion Scattering (LEIS) have been extensively combined with electrochemical techniques to follow the chemical and structural changes at the surface. The highly reactive lanthanide atoms are not stable in the presence of oxygen and readily oxidize. The surface oxides are completely dissolved in the electrolyte. In Pt5La and Pt5Ce the so formed Pt overlayer provides kinetic stability against the further oxidation and dissolution. At the same time, it ensures a very high stability during ORR potential cycling, suggesting that these alloys hold promise as cathode catalysts in Proton Exchange Membrane Fuel Cells (PEMFCs).
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