A new approach to fuel cell electrodes: lanthanum aluminate yielding fine Pt nanoparticle exsolution for oxygen reduction reaction

Selda Ozkan, Seo Jin Kim, David N. Miller, John T. S. Irvine*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Designing an electrocatalyst with low Pt content is an immediate need for essential reactions in low temperature fuel cell systems. In the present work, La0.9925Ba0.0075Al0.995Pt0.005O3 is aimed at using with low (only 0.5%) Pt doping as an electrocatalyst for oxygen reduction reaction (ORR). The low doping level renders exsolution of 1–2 nm nanoparticles with uniform dispersion upon reduction in H2/N2 at low temperatures. Pt exsolved perovskite oxides deliver significantly enhanced catalytic activity for ORR and improved stability in alkaline media. This study demonstrates that LaAlO3 with low noble metal content holds immense potential as an electrocatalyst in real fuel cell systems.
Original languageEnglish
JournalAdvanced Energy Materials
VolumeEarly View
Early online date13 Feb 2024
DOIs
Publication statusE-pub ahead of print - 13 Feb 2024

Keywords

  • Alkaline fuel cells
  • Electrocatalyst
  • LaAIO3
  • Oxygen reduction reaction
  • ORR
  • Perovskite oxides
  • Pt exsolution

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