Enhanced activity and stability of Pt–La and Pt–Ce alloys for oxygen electroreduction: the elucidation of the active surface phase
Abstract
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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The leakage level (or Pt enrichment) and the thickness of the dealloyed region vary with different alloys, preparation techniques and electrochemical treatments.
“The leakage level (or Pt enrichment) and the thickness of the dealloyed region vary with different alloys, preparation techniques and electrochemical treatments.18,19”
From A comprehensive review of Pt electrocatalysts for the oxygen reduction reaction: Nanostructure, activity, mechanism and carbon support in PEM fuel cells (2017) · cites this paper as [18]
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- Authors
- Malacrida, P., Escudero-Escribano, M., Verdaguer-Casadevall, A., Stephens, I. E. L., & Chorkendorff, I.
- Affiliations
- Technical University of Denmark (DK)
- Corresponding author
- Chorkendorff, Ib
- Venue
- Journal of Materials Chemistry A
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2014
- Volume
- 2
- Issue
- 12
- Pages
- 4234
- ISSN
- 2050-7488 (ISSN-L)
- 2050-7496
- OpenAlex
- W1996148062
- Cited by
- 138
- References
- 72
- Citations by year
- 2026: 8 · 2025: 12 · 2024: 16 · 2023: 15 · 2022: 8 · 2021: 7 · 2020: 10 · 2019: 8 · 2018: 14 · 2017: 8 · 2016: 16 · 2015: 11 · 2014: 5
- FWCI
- 4.40
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Materials Chemistry A (publishedVersion)
- Technical University of Denmark, DTU Orbit (Technical University of Denmark, DTU) (submittedVersion)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Fuel Cells and Related Materials
- Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
- Keywords
- oxygen reduction reaction, electrocatalysts, corrosion resistance, catalyst stability, proton exchange membrane fuel cells, potential cycling
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