Emergence of high ORR activity through controlling local density-of-states by alloying immiscible Au and Ir

Kohei Kusada, Dongshuang Wu, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Wei Xie, Michihisa Koyama, Shogo Kawaguchi, Yoshiki Kubota, Hiroshi Kitagawa

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The electronic structure of surface atoms has a great effect on catalytic activity because the binding energy of reactants is closely related to the electronic structure. Therefore, designing and controlling the local density of states (LDOS) of the catalyst surface would be a rational way to develop innovative catalysts. Herein, we first demonstrate a highly active AuIr solid-solution alloy electrocatalyst for the oxygen reduction reaction (ORR) by emulating the Pt LDOS profile. The calculated LDOS of Ir atoms on the Au 0.5 Ir 0.5 (111) surface closely resembled that of Pt(111), resulting in suitable oxygen adsorption energy on the alloy surface for the ORR. We successfully synthesized AuIr solid-solution alloys, while Ir and Au are immiscible even above their melting points in the bulk state. Although monometallic Ir or Au is not active for the ORR, the synthesized Au 0.5 Ir 0.5 alloy demonstrated comparable activity to Pt at 0.9 V versus a reversible hydrogen electrode.

Original languageEnglish
Pages (from-to)652-656
Number of pages5
JournalChemical Science
Volume10
Issue number3
DOIs
Publication statusPublished - Jan 1 2019

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Alloying
Oxygen
Electronic structure
Solid solutions
Atoms
Catalysts
Electrocatalysts
Binding energy
Melting point
Hydrogen
Reactive Oxygen Species
Catalyst activity
Adsorption
Electrodes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Emergence of high ORR activity through controlling local density-of-states by alloying immiscible Au and Ir. / Kusada, Kohei; Wu, Dongshuang; Yamamoto, Tomokazu; Toriyama, Takaaki; Matsumura, Syo; Xie, Wei; Koyama, Michihisa; Kawaguchi, Shogo; Kubota, Yoshiki; Kitagawa, Hiroshi.

In: Chemical Science, Vol. 10, No. 3, 01.01.2019, p. 652-656.

Research output: Contribution to journalArticle

Kusada, K, Wu, D, Yamamoto, T, Toriyama, T, Matsumura, S, Xie, W, Koyama, M, Kawaguchi, S, Kubota, Y & Kitagawa, H 2019, 'Emergence of high ORR activity through controlling local density-of-states by alloying immiscible Au and Ir', Chemical Science, vol. 10, no. 3, pp. 652-656. https://doi.org/10.1039/c8sc04135k
Kusada, Kohei ; Wu, Dongshuang ; Yamamoto, Tomokazu ; Toriyama, Takaaki ; Matsumura, Syo ; Xie, Wei ; Koyama, Michihisa ; Kawaguchi, Shogo ; Kubota, Yoshiki ; Kitagawa, Hiroshi. / Emergence of high ORR activity through controlling local density-of-states by alloying immiscible Au and Ir. In: Chemical Science. 2019 ; Vol. 10, No. 3. pp. 652-656.
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AU - Matsumura, Syo

AU - Xie, Wei

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