期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 41, 页码 15980-15985出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta05517f
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [26630408]
- Hod Sciences and Arts Foundation
- Japan Petroleum Institute
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.
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