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Issue 41, 2016
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Improved hydrogen oxidation reaction under alkaline conditions by ruthenium–iridium alloyed nanoparticles

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Abstract

Carbon supported Ru–Ir (Ru–Ir/C) catalysts with their alloyed nanoparticles and those mainly having segregated Ru and Ir nanoparticles were prepared. The Ru–Ir alloyed nanoparticles improved the hydrogen oxidation reaction (HOR) activity under alkaline conditions in comparison with the segregated Ru and Ir nanoparticles as well as Ru/C and Ir/C. Furthermore, the HOR activity of Ru–Ir alloyed nanoparticles was ca. four times higher than that of Pt/C. The cause of the enhanced HOR activity of Ru–Ir alloyed nanoparticles was investigated in terms of the hydrogen-binding energy (HBE). It was found that the HOR activity increases with a decrease of the HBE, and Ru–Ir alloying lowers the HBE in comparison with the segregated Ru–Ir nanoparticles and Ir/C. Therefore, the lowered HBE by Ru–Ir alloying was considered to be responsible for the high HOR activity of Ru–Ir alloyed nanoparticles.

Graphical abstract: Improved hydrogen oxidation reaction under alkaline conditions by ruthenium–iridium alloyed nanoparticles

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Supplementary files

Article information


Submitted
01 Jul 2016
Accepted
05 Sep 2016
First published
05 Sep 2016

J. Mater. Chem. A, 2016,4, 15980-15985
Article type
Paper

Improved hydrogen oxidation reaction under alkaline conditions by ruthenium–iridium alloyed nanoparticles

J. Ohyama, D. Kumada and A. Satsuma, J. Mater. Chem. A, 2016, 4, 15980
DOI: 10.1039/C6TA05517F

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