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Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation

Kirill Yusenko, Elena Bykova, Maxim Bykov, Sephira Riva, Wilson A. Crichton, Maria V. Yusenko, Aleksandr S. Sukhikh, Serena Arnaboldi, Michael Hanfland, Leonid S. Dubrovinsky, Sergey A. Gromilov

Acta Materialia, Volume: 139, Pages: 236 - 243

Swansea University Author: Kirill Yusenko

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DOI (Published version): 10.1016/j.actamat.2017.08.012

Abstract

The formation of the hcp-Ir0.70Re0.30 alloy from the single-source precursor (NH4)2[Ir0.70Re0.30Cl6] upon heating in hydrogen atmosphere can be associated with the formation of two intermediates: a crystalline iridium-based intermediate and a fcc-structured alloy. Ir–Re alloys show lower thermal exp...

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Published in: Acta Materialia
ISSN: 1359-6454
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa34955
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spelling 2017-10-09T11:00:37.8395609 v2 34955 2017-08-21 Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation 5f69729173cc92ee7f08d59ffcef3e81 Kirill Yusenko Kirill Yusenko true false 2017-08-21 EEN The formation of the hcp-Ir0.70Re0.30 alloy from the single-source precursor (NH4)2[Ir0.70Re0.30Cl6] upon heating in hydrogen atmosphere can be associated with the formation of two intermediates: a crystalline iridium-based intermediate and a fcc-structured alloy. Ir–Re alloys show lower thermal expansion coefficients and smaller compressibility in comparison with individual metals. The high-temperature high-pressure treatment of hcp-Ir0.70Re0.30 alloy enable us to probe the Ir–Re pressure dependent phase diagram. The miscibility gap between hcp and fcc alloys slightly shifts towards the rhenium side below 4 GPa. Above 4 GPa, the miscibility gap does not drift with pressure and narrows with compression. The electrocatalytic activity of Ir–Re alloys has been tested for methanol oxidation in acidic water solution. Ir–Re alloys show higher electrocatalytic activity in comparison with pure Ir and Re, which makes them perspective candidates for fuel cells application. The highest electrocatalytic activity has been obtained for the two-phase Ir0.85Re0.15 composition. Journal Article Acta Materialia 139 236 243 1359-6454 High-pressure; High-temperature; Alloys; Phase diagrams; X-ray diffraction; Electrocatalysis 15 10 2017 2017-10-15 10.1016/j.actamat.2017.08.012 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2017-10-09T11:00:37.8395609 2017-08-21T15:40:56.6619426 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Kirill Yusenko 1 Elena Bykova 2 Maxim Bykov 3 Sephira Riva 4 Wilson A. Crichton 5 Maria V. Yusenko 6 Aleksandr S. Sukhikh 7 Serena Arnaboldi 8 Michael Hanfland 9 Leonid S. Dubrovinsky 10 Sergey A. Gromilov 11 0034955-21082017154312.pdf yusenko2017.pdf 2017-08-21T15:43:12.7100000 Output 3013592 application/pdf Accepted Manuscript true 2018-08-10T00:00:00.0000000 true eng
title Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation
spellingShingle Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation
Kirill Yusenko
title_short Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation
title_full Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation
title_fullStr Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation
title_full_unstemmed Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation
title_sort Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation
author_id_str_mv 5f69729173cc92ee7f08d59ffcef3e81
author_id_fullname_str_mv 5f69729173cc92ee7f08d59ffcef3e81_***_Kirill Yusenko
author Kirill Yusenko
author2 Kirill Yusenko
Elena Bykova
Maxim Bykov
Sephira Riva
Wilson A. Crichton
Maria V. Yusenko
Aleksandr S. Sukhikh
Serena Arnaboldi
Michael Hanfland
Leonid S. Dubrovinsky
Sergey A. Gromilov
format Journal article
container_title Acta Materialia
container_volume 139
container_start_page 236
publishDate 2017
institution Swansea University
issn 1359-6454
doi_str_mv 10.1016/j.actamat.2017.08.012
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description The formation of the hcp-Ir0.70Re0.30 alloy from the single-source precursor (NH4)2[Ir0.70Re0.30Cl6] upon heating in hydrogen atmosphere can be associated with the formation of two intermediates: a crystalline iridium-based intermediate and a fcc-structured alloy. Ir–Re alloys show lower thermal expansion coefficients and smaller compressibility in comparison with individual metals. The high-temperature high-pressure treatment of hcp-Ir0.70Re0.30 alloy enable us to probe the Ir–Re pressure dependent phase diagram. The miscibility gap between hcp and fcc alloys slightly shifts towards the rhenium side below 4 GPa. Above 4 GPa, the miscibility gap does not drift with pressure and narrows with compression. The electrocatalytic activity of Ir–Re alloys has been tested for methanol oxidation in acidic water solution. Ir–Re alloys show higher electrocatalytic activity in comparison with pure Ir and Re, which makes them perspective candidates for fuel cells application. The highest electrocatalytic activity has been obtained for the two-phase Ir0.85Re0.15 composition.
published_date 2017-10-15T03:43:24Z
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score 11.036116

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