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Chem Sci. 2019 Apr 25;10(19):5133-5137. doi: 10.1039/c9sc00496c. eCollection 2019 May 21.

Solid-solution alloy nanoparticles of a combination of immiscible Au and Ru with a large gap of reduction potential and their enhanced oxygen evolution reaction performance.

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Division of Chemistry , Graduate School of Science , Kyoto University , Kitashirakawa- Oiwakecho, Sakyo-ku , Kyoto 606-8502 , Japan . Email: ; Email:
Department of Applied Quantum Physics and Nuclear Engineering , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka 819-0395 , Japan.
The Ultramicroscopy Research Center , Kyushu University , Motooka 744, Nishi-ku , Fukuoka 819-0395 , Japan.
INAMORI Frontier Research Center , Kyushu University , Motooka 744, Nishi-ku , Fukuoka 819-0395 , Japan.
Japan Synchrotron Radiation Research Insitute (JASRI) , SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun , Hyogo 679-5198 , Japan.
Department of Physical Science , Graduate School of Science , Osaka Prefecture University , 1-1 Gakuen-cho, Naka-ku, Sakai , Osaka 599-8531 , Japan.


Au and Ru are elements that are immiscible in the bulk state and have the largest gap in reduction potential among noble metals. Here, for the first time, Au x Ru1-x solid-solution alloy nanoparticles (NPs) were successfully synthesized over the whole composition range through a chemical reduction method. Powder X-ray diffraction and scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy showed that Au and Ru atoms are homogeneously mixed at the atomic level. We investigated the catalytic performance of Au x Ru1-x NPs for the oxygen evolution reaction, for which Ru is well known to be one of the best monometallic catalysts, and we found that even alloying with a small amount of Au could significantly enhance the catalytic performance.

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