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

DOI: 10.1016/j.scriptamat.2017.05.022 DOI Help

Authors: Kirill V. Yusenko (Swansea University; Institute of Solid State Chemistry) , Sephira Riva (Swansea University) , Patricia A. Carvalho (SINTEF Materials and Chemistry; CEFEMA) , Maria V. Yusenko , Serena Arnaboldi (Università degli Studi di Milano) , Aleksandr S. Sukhikh (Novosibirsk State University; Nikolaev Institute of Inorganic Chemistry) , Michael Hanfland (ESRF-The European Synchrotron) , Sergey A. Gromilov (Novosibirsk State University; Nikolaev Institute of Inorganic Chemistry)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scripta Materialia , VOL 138 , PAGES 22 - 27

State: Published (Approved)
Published: September 2017
Diamond Proposal Number(s): 13987

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.

Journal Keywords: High-entropy alloys; X-ray diffraction; Platinum group alloys; Electrochemistry

Subject Areas: Materials, Chemistry


Instruments: I11-High Resolution Powder Diffraction

Other Facilities: ESRF