First hexagonal close packed high-entropy alloy with outstanding stability under extreme conditions and electrocatalytic activity for methanol oxidation

Kirill V. Yusenko, Sephira Riva, Patricia A. Carvalho, Maria V. Yusenko, Serena Arnaboldi, Aleksandr S. Sukhikh, Michael Hanfland, Sergey A. Gromilov

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)

Abstract

High-entropy alloys containing 5 and 6 platinum group metals have been prepared by thermal decomposition of single-source precursors non requiring high temperature or mechanical alloying. The prepared Ir0.19Os0.22Re0.21Rh0.20Ru0.19 alloy is the first example of a single-phase hexagonal high-entropy alloy. Heat treatment up to 1500 K and compression up to 45 GPa do not result in phase changes, a record temperature and pressure stability for a single-phase high-entropy alloy. The alloys show pronounced electrocatalytic activity in methanol oxidation, which opens a route for the use of high-entropy alloys as materials for sustainable energy conversion.

Original languageEnglish
Pages (from-to)22-27
Number of pages6
JournalScripta Materialia
Volume138
DOIs
Publication statusPublished - 1 Sep 2017

Keywords

  • Electrochemistry
  • High-entropy alloys
  • Platinum group alloys
  • X-ray diffraction
  • FORMIC-ACID
  • IRIDIUM
  • MULTIELEMENT NANOPARTICLES
  • BINARY
  • ELECTROOXIDATION
  • TERNARY
  • CATALYST
  • OSMIUM
  • ABSOLUTE-ZERO

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