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Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation. / Yusenko, Kirill V.; Bykova, Elena; Bykov, Maxim и др.
в: Acta Materialia, Том 139, 15.10.2017, стр. 236-243.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation
AU - Yusenko, Kirill V.
AU - Bykova, Elena
AU - Bykov, Maxim
AU - Riva, Sephira
AU - Crichton, Wilson A.
AU - Yusenko, Maria V.
AU - Sukhikh, Aleksandr S.
AU - Arnaboldi, Serena
AU - Hanfland, Michael
AU - Dubrovinsky, Leonid S.
AU - Gromilov, Sergey A.
N1 - Publisher Copyright: © 2017 Acta Materialia Inc.
PY - 2017/10/15
Y1 - 2017/10/15
N2 - 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.
AB - 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.
KW - Alloys
KW - Electrocatalysis
KW - High-pressure
KW - High-temperature
KW - Phase diagrams
KW - X-ray diffraction
KW - SYSTEM
KW - HIGH-PRESSURE
KW - HYDROGENOLYSIS
KW - THERMAL-EXPANSION
KW - STABILITY
KW - HIGH-TEMPERATURE
KW - COMPRESSIBILITY
KW - RHENIUM
KW - MODIFIED IRIDIUM CATALYST
KW - PHASE-DIAGRAM
UR - http://www.scopus.com/inward/record.url?scp=85027417673&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2017.08.012
DO - 10.1016/j.actamat.2017.08.012
M3 - Article
AN - SCOPUS:85027417673
VL - 139
SP - 236
EP - 243
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
ER -
ID: 9076485