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Synthesis of Nanohole-Structured Single-Crystalline Platinum Nanosheets Using Surfactant-Liquid-Crystals and their Electrochemical Characterization

Authors

  • Tsuyoshi Kijima,

    Corresponding author
    1. Department of Applied Chemistry, Faculty of Engineering, Miyazaki University Miyazaki, 889-2192 (Japan)
    • Department of Applied Chemistry, Faculty of Engineering, Miyazaki University Miyazaki, 889-2192 (Japan).
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  • Yu Nagatomo,

    1. Department of Applied Chemistry, Faculty of Engineering, Miyazaki University Miyazaki, 889-2192 (Japan)
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  • Hirokatsu Takemoto,

    1. Department of Applied Chemistry, Faculty of Engineering, Miyazaki University Miyazaki, 889-2192 (Japan)
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  • Masafumi Uota,

    1. CREST, Japan Science and Technology Cooperation 4-1-8 Honcho, Kawaguchi (Japan)
    2. Present address: DIC Corporation, Central Research Laboratories, 631 Sakato, Sakura, Chiba 285-8668, Japan
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  • Daisuke Fujikawa,

    1. Department of Applied Chemistry, Faculty of Engineering, Miyazaki University Miyazaki, 889-2192 (Japan)
    2. Present address: Corporate Research Laboratories Mitsubishi Rayon Co. Ltd., Ohtake, Hiroshima, 739-0693, Japan
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  • Yuzo Sekiya,

    1. Department of Applied Chemistry, Faculty of Engineering, Miyazaki University Miyazaki, 889-2192 (Japan)
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  • Teppei Kishishita,

    1. Department of Applied Chemistry, Faculty of Engineering, Miyazaki University Miyazaki, 889-2192 (Japan)
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  • Makoto Shimoda,

    1. Department of Applied Chemistry, Faculty of Engineering, Miyazaki University Miyazaki, 889-2192 (Japan)
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  • Takumi Yoshimura,

    1. Department of Applied Chemistry, Faculty of Engineering, Miyazaki University Miyazaki, 889-2192 (Japan)
    2. Present address: Sumika Chemical Analysis Service, Ltd., Tsukuba Laboratory, 6, Kitahara, Tsukuba, Ibaraki, 300-3266, Japan
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  • Hideya Kawasaki,

    1. Department of Applied Chemistry, Faculty of Engineering, Miyazaki University Miyazaki, 889-2192 (Japan)
    2. Department of Chemistry and Materials Engineering Faculty of Chemistry, Materials and Bioengineering, Kansai University Suita, Osaka 564-8680 (Japan)
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  • Go Sakai

    1. Department of Applied Chemistry, Faculty of Engineering, Miyazaki University Miyazaki, 889-2192 (Japan)
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Abstract

Nanohole-structured single-crystalline Pt nanosheets have been synthesized by the borohydride reduction of Na2PtCl6 confined to the lyotropic liquid crystals (LLCs) of polyoxyethylene (20) sorbitan monooleate (Tween 80) with or without nonaethylene-glycol (C12EO9). The Pt nanosheets of around 4–10 nm in central thickness and up to 500 nm or above in diameter have a number of hexagonal-shaped nanoholes ∼1.8 nm wide. High-resolution electron microscope images of the nanosheets showed atomic fringes with a spacing of 0.22 nm indicating that the nanosheets are crystallographically continuous through the nanoholed and non-holed areas. The inner-angle distributions for the hexagonal nanoholes indicate that the six sides of the nanoholes are walled with each two Pt (111), Pt (1equation image1) and Pt (010) planes. The formation mechanism of nanoholed Pt nanosheets is discussed on the basis of structural and compositional data for the resulting solids and their precursory LLCs, with the aid of similar nanohole growth observed for a Tween 80 free but oleic acid-incorporated system. It is also demonstrated that the nanoholed Pt nanostructures loaded on carbon exhibit fairly high electrocatalytic activity for oxygen reduction reaction and a high performance as a cathode material for polymer-electrolyte fuel cells, along with their extremely high thermostability revealed through the effect of electron-irradiation.

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