Bimetallic Au–Ni Nanoparticles Embedded in SiO2 Nanospheres: Synergetic Catalysis in Hydrolytic Dehydrogenation of Ammonia Borane

Authors

  • Hai-Long Jiang Dr.,

    1. National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577 (Japan), Fax: (+81) 72-751-7942
    2. CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012 (Japan)
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  • Tetsuo Umegaki Dr.,

    1. National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577 (Japan), Fax: (+81) 72-751-7942
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  • Tomoki Akita Dr.,

    1. National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577 (Japan), Fax: (+81) 72-751-7942
    2. CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012 (Japan)
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  • Xin-Bo Zhang Dr.,

    1. National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577 (Japan), Fax: (+81) 72-751-7942
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  • Masatake Haruta Prof. Dr.,

    1. Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397 (Japan)
    2. CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012 (Japan)
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  • Qiang Xu Prof. Dr.

    1. National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577 (Japan), Fax: (+81) 72-751-7942
    2. CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012 (Japan)
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Abstract

Gold–nickel nanoparticles (NPs) of 3–4 nm diameter embedded in silica nanospheres of around 15 nm have been prepared by using [Au(en)2Cl3] and [Ni(NH3)6Cl2] as precursors in a NP-5/cyclohexane reversed-micelle system, and by in situ reduction in an aqueous solution of NaBH4/NH3BH3. Compared with monometallic Au@SiO2 and Ni@SiO2, the as-synthesized Au–Ni@SiO2 catalyst shows higher catalytic activity and better durability in the hydrolysis of ammonia borane, generating a nearly stoichiometric amount of hydrogen. During the generation of H2, the synergy effect between gold and nickel is apparent: The nickel species stabilizes the gold NPs and the existence of gold helps to improve the catalytic activity and durability of the nickel NPs.

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