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Boosting hot electron flux and catalytic activity at metal–oxide interfaces of PtCo bimetallic nanoparticles

Author

Listed:
  • Hyosun Lee

    (Institute for Basic Science (IBS))

  • Juhyung Lim

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Changhwan Lee

    (Institute for Basic Science (IBS)
    Korea Advanced Institute of Science and Technology (KAIST))

  • Seoin Back

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Kwangjin An

    (Ulsan National Institute of Science and Technology (UNIST))

  • Jae Won Shin

    (Institute for Basic Science (IBS))

  • Ryong Ryoo

    (Institute for Basic Science (IBS)
    Korea Advanced Institute of Science and Technology (KAIST))

  • Yousung Jung

    (Korea Advanced Institute of Science and Technology (KAIST))

  • Jeong Young Park

    (Institute for Basic Science (IBS)
    Korea Advanced Institute of Science and Technology (KAIST)
    Korea Advanced Institute of Science and Technology (KAIST))

Abstract

Despite numerous studies, the origin of the enhanced catalytic performance of bimetallic nanoparticles (NPs) remains elusive because of the ever-changing surface structures, compositions, and oxidation states of NPs under reaction conditions. An effective strategy for obtaining critical clues for the phenomenon is real-time quantitative detection of hot electrons induced by a chemical reaction on the catalysts. Here, we investigate hot electrons excited on PtCo bimetallic NPs during H2 oxidation by measuring the chemicurrent on a catalytic nanodiode while changing the Pt composition of the NPs. We reveal that the presence of a CoO/Pt interface enables efficient transport of electrons and higher catalytic activity for PtCo NPs. These results are consistent with theoretical calculations suggesting that lower activation energy and higher exothermicity are required for the reaction at the CoO/Pt interface.

Suggested Citation

  • Hyosun Lee & Juhyung Lim & Changhwan Lee & Seoin Back & Kwangjin An & Jae Won Shin & Ryong Ryoo & Yousung Jung & Jeong Young Park, 2018. "Boosting hot electron flux and catalytic activity at metal–oxide interfaces of PtCo bimetallic nanoparticles," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04713-8
    DOI: 10.1038/s41467-018-04713-8
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