Solid‐Solution Alloy Nanoparticles of the Immiscible Iridium–Copper System with a Wide Composition Range for Enhanced Electrocatalytic Applications |
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| Authors: | Dr. Fenglong Wang Dr. Kohei Kusada Dr. Dongshuang Wu Tomokazu Yamamoto Takaaki Toriyama Prof. Syo Matsumura Dr. Yusuke Nanba Prof. Michihisa Koyama Prof. Hiroshi Kitagawa |
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| Affiliation: | 1. Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, Japan;2. Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka, Japan;3. The Ultramicroscopy Researcher Center, Kyushu University, Fukuoka, Japan;4. INAMORI Frontier Research Center, Kyushu University, Fukuoka, Japan |
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| Abstract: | For the first time, we synthesize solid‐solution alloy nanoparticles of Ir and Cu with a size of ca. 2 nm, despite Ir and Cu being immiscible in the bulk up to their melting over the whole composition range. We performed a systematic characterization on the nature of the IrxCu1?x solid‐solution alloys using powder X‐ray diffraction, scanning transmission electron microscopy coupled with energy‐dispersive X‐ray spectroscopy and X‐ray photoelectron spectroscopy. The results showed that the IrxCu1?x alloys had a face‐centered‐cubic structure; charge transfer from Cu to Ir occurred in the alloy nanoparticles, as the core‐level Ir 4f peaks shifted to lower energy region with the increase in Cu content. Furthermore, we observed that the alloying of Ir with Cu enhanced both the electrocatalytic oxygen evolution and oxygen reduction reactions. The enhanced activities could be attributed to the electronic interaction between Ir and Cu arising from the alloying effect at atomic‐level. |
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| Keywords: | copper iridium nanoparticles oxygen evolution reaction solid-solution alloy |
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