Pt-surface stabilization by high-entropy alloys for enhancing oxygen reduction reaction property: Single-crystal model catalyst study

Yoshihiro Chida, Takeru Tomimori, Naoto Todoroki, Toshimasa Wadayama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this work, we study the oxygen reduction reaction (ORR) properties of Pt-containing 3d transition-metal high-entropy alloy (Pt-HEA) surfaces, focusing on the constituent alloying elements. The surface Pt and underlying Cr-Mn-Co-Ni(1 1 1) (Pt/Cr-Mn-Co-Ni(1 1 1)) stacked lattice layers, which are synthesized through the vacuum deposition of the underlying alloy and surface Pt stacking layers on Pt(1 1 1) substrate, exhibit high pristine ORR activity and structural stability under potential-cycle loading, compared to Pt/Cr-Co-Ni, Pt/Mn-Co-Ni, and Pt/Co-Ni(1 1 1) surfaces. The outperformed ORR properties are attributed to the effective suppression of the surface segregation of Cr. This study demonstrates that not only the “high-entropy” effect induced by increasing the numbers of constituent elements but also the “chemical affinity” of Pt and the individual HEA constituent elements determine the ORR performances of Pt-HEA.

Original languageEnglish
Article number107657
JournalElectrochemistry Communications
Volume159
DOIs
Publication statusPublished - 2024 Feb

Keywords

  • High-entropy alloys
  • Model catalyst study
  • Oxygen reduction reaction
  • Platinum
  • Surface free energy
  • Surface segregation

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