論文

査読有り 国際誌
2019年1月21日

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

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

10
3
開始ページ
652
終了ページ
656
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1039/c8sc04135k

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 Au0.5Ir0.5(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 Au0.5Ir0.5 alloy demonstrated comparable activity to Pt at 0.9 V versus a reversible hydrogen electrode.

リンク情報
DOI
https://doi.org/10.1039/c8sc04135k
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/30774865
PubMed Central
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6349063
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000457304200035&DestApp=WOS_CPL
ID情報
  • DOI : 10.1039/c8sc04135k
  • ISSN : 2041-6520
  • PubMed ID : 30774865
  • PubMed Central 記事ID : PMC6349063
  • Web of Science ID : WOS:000457304200035

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