Electrochemical synthesis of mesoporous Pt-Au binary alloys with tunable compositions for enhancement of electrochemical performance

Yusuke Yamauchi, Akihisa Tonegawa, Masaki Komatsu, Hongjing Wang, Liang Wang, Yoshihiro Nemoto, Norihiro Suzuki, Kazuyuki Kuroda

    Research output: Contribution to journalArticle

    191 Citations (Scopus)

    Abstract

    Mesoporous Pt-Au binary alloys were electrochemically synthesized from lyotropic liquid crystals (LLCs) containing corresponding metal species. Two-dimensional exagonally ordered LLC templates were prepared on conductive substrates from diluted surfactant solutions including water, a nonionic surfactant, ethanol, and metal species by drop-coating. Electrochemical synthesis using such LLC templates enabled the preparation of ordered mesoporous Pt-Au binary alloys without phase segregation. The framework composition in the mesoporous Pt-Au alloy was controlled simply by changing the compositional ratios in the precursor solution. Mesoporous Pt-Au alloys with low Au content exhibited well-ordered 2D hexagonal mesostructures, reflecting those of the original templates. With increasing Au content, however, the mesostructural order gradually decreased, thereby reducing the electrochemically active surface area. Wide-angle X-ray diffraction profiles, X-ray photoelectron spectra, and elemental mapping showed that both Pt and Au were atomically distributed in the frameworks. The electrochemical stability of mesoporous Pt-Au alloys toward methanol oxidation was highly improved relative to that of nonporous Pt and mesoporous Pt films, suggesting that mesoporous Pt-Au alloy films are potentially applicable as electrocatalysts for direct methanol fuel cells. Also, mesoporous Pt-Au alloy electrodes showed a highly sensitive amperometric response for glucose molecules, which will be useful in next-generation enzyme-free glucose sensors.

    Original languageEnglish
    Pages (from-to)5100-5109
    Number of pages10
    JournalJournal of the American Chemical Society
    Volume134
    Issue number11
    DOIs
    Publication statusPublished - 2012 Mar 21

    Fingerprint

    Binary alloys
    Liquid Crystals
    Liquid crystals
    Chemical analysis
    Metals
    Surface-Active Agents
    Glucose sensors
    Methanol
    Direct methanol fuel cells (DMFC)
    Electrocatalysts
    Nonionic surfactants
    Photoelectrons
    Glucose
    Surface active agents
    Ethanol
    Enzymes
    X-Ray Diffraction
    X ray diffraction
    X rays
    Coatings

    ASJC Scopus subject areas

    • Chemistry(all)
    • Catalysis
    • Biochemistry
    • Colloid and Surface Chemistry

    Cite this

    Electrochemical synthesis of mesoporous Pt-Au binary alloys with tunable compositions for enhancement of electrochemical performance. / Yamauchi, Yusuke; Tonegawa, Akihisa; Komatsu, Masaki; Wang, Hongjing; Wang, Liang; Nemoto, Yoshihiro; Suzuki, Norihiro; Kuroda, Kazuyuki.

    In: Journal of the American Chemical Society, Vol. 134, No. 11, 21.03.2012, p. 5100-5109.

    Research output: Contribution to journalArticle

    Yamauchi, Yusuke ; Tonegawa, Akihisa ; Komatsu, Masaki ; Wang, Hongjing ; Wang, Liang ; Nemoto, Yoshihiro ; Suzuki, Norihiro ; Kuroda, Kazuyuki. / Electrochemical synthesis of mesoporous Pt-Au binary alloys with tunable compositions for enhancement of electrochemical performance. In: Journal of the American Chemical Society. 2012 ; Vol. 134, No. 11. pp. 5100-5109.
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    abstract = "Mesoporous Pt-Au binary alloys were electrochemically synthesized from lyotropic liquid crystals (LLCs) containing corresponding metal species. Two-dimensional exagonally ordered LLC templates were prepared on conductive substrates from diluted surfactant solutions including water, a nonionic surfactant, ethanol, and metal species by drop-coating. Electrochemical synthesis using such LLC templates enabled the preparation of ordered mesoporous Pt-Au binary alloys without phase segregation. The framework composition in the mesoporous Pt-Au alloy was controlled simply by changing the compositional ratios in the precursor solution. Mesoporous Pt-Au alloys with low Au content exhibited well-ordered 2D hexagonal mesostructures, reflecting those of the original templates. With increasing Au content, however, the mesostructural order gradually decreased, thereby reducing the electrochemically active surface area. Wide-angle X-ray diffraction profiles, X-ray photoelectron spectra, and elemental mapping showed that both Pt and Au were atomically distributed in the frameworks. The electrochemical stability of mesoporous Pt-Au alloys toward methanol oxidation was highly improved relative to that of nonporous Pt and mesoporous Pt films, suggesting that mesoporous Pt-Au alloy films are potentially applicable as electrocatalysts for direct methanol fuel cells. Also, mesoporous Pt-Au alloy electrodes showed a highly sensitive amperometric response for glucose molecules, which will be useful in next-generation enzyme-free glucose sensors.",
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