Bimetallic Au–Ni Nanoparticles Embedded in SiO2 Nanospheres: Synergetic Catalysis in Hydrolytic Dehydrogenation of Ammonia Borane |
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| Authors: | Hai‐Long Jiang Dr Tetsuo Umegaki Dr Tomoki Akita Dr Xin‐Bo Zhang Dr Masatake Haruta Prof?Dr Qiang Xu Prof?Dr |
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| Institution: | 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);3. Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Hachioji, Tokyo 192‐0397 (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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| Keywords: | dehydrogenation gold heterogeneous catalysis nanoparticles nickel |
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