Solid-Solution Alloy Nanoparticles of the Immiscible Iridium–Copper System with a Wide Composition Range for Enhanced Electrocatalytic Applications

Fenglong Wang, Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Yusuke Nanba, Michihisa Koyama, Hiroshi Kitagawa

研究成果: ジャーナルへの寄稿記事

18 引用 (Scopus)

抄録

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.

元の言語英語
ページ(範囲)4505-4509
ページ数5
ジャーナルAngewandte Chemie - International Edition
57
発行部数17
DOI
出版物ステータス出版済み - 4 16 2018

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Solid solutions
Nanoparticles
Chemical analysis
Alloying
Oxygen
Core levels
X ray powder diffraction
Charge transfer
Melting
X ray photoelectron spectroscopy
Transmission electron microscopy
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

これを引用

Solid-Solution Alloy Nanoparticles of the Immiscible Iridium–Copper System with a Wide Composition Range for Enhanced Electrocatalytic Applications. / Wang, Fenglong; Kusada, Kohei; Wu, Dongshuang; Yamamoto, Tomokazu; Toriyama, Takaaki; Matsumura, Syo; Nanba, Yusuke; Koyama, Michihisa; Kitagawa, Hiroshi.

:: Angewandte Chemie - International Edition, 巻 57, 番号 17, 16.04.2018, p. 4505-4509.

研究成果: ジャーナルへの寄稿記事

Wang, Fenglong ; Kusada, Kohei ; Wu, Dongshuang ; Yamamoto, Tomokazu ; Toriyama, Takaaki ; Matsumura, Syo ; Nanba, Yusuke ; Koyama, Michihisa ; Kitagawa, Hiroshi. / Solid-Solution Alloy Nanoparticles of the Immiscible Iridium–Copper System with a Wide Composition Range for Enhanced Electrocatalytic Applications. :: Angewandte Chemie - International Edition. 2018 ; 巻 57, 番号 17. pp. 4505-4509.
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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.",
author = "Fenglong Wang and Kohei Kusada and Dongshuang Wu and Tomokazu Yamamoto and Takaaki Toriyama and Syo Matsumura and Yusuke Nanba and Michihisa Koyama and Hiroshi Kitagawa",
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AU - Wang, Fenglong

AU - Kusada, Kohei

AU - Wu, Dongshuang

AU - Yamamoto, Tomokazu

AU - Toriyama, Takaaki

AU - Matsumura, Syo

AU - Nanba, Yusuke

AU - Koyama, Michihisa

AU - Kitagawa, Hiroshi

PY - 2018/4/16

Y1 - 2018/4/16

N2 - 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.

AB - 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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