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

机译:嵌入SiO2纳米球的双金属Au-Ni纳米颗粒:氨硼烷水解脱氢中的能动催化

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摘要

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 [NiACHTUNGTRENUNG(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.
机译:通过使用[Au(en)2Cl3]和[NiACHTUNGTRENUNG(NH3)6Cl2]作为前体在NP-5 /环己烷中制备了嵌入在约15 nm的二氧化硅纳米球中的直径为3-4 nm的金镍纳米颗粒(NPs)逆胶束系统,并原位还原NaBH4 / NH3BH3水溶液。与单金属Au @ SiO2和Ni @ SiO2相比,合成后的Au-Ni @ SiO2催化剂在氨硼烷水解中显示出更高的催化活性和更好的耐久性,产生了接近化学计量的氢。在生成H2的过程中,金和镍之间的协同作用显而易见:镍物种稳定了金纳米颗粒,金的存在有助于提高镍纳米颗粒的催化活性和耐久性。

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