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标题：One-pot synthesis of core-shell Cu@SiO₂ nanospheres and their catalysis for hydrolytic dehydrogenation of ammonia borane and hydrazine borane
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作者：Qilu Yao ; Zhang-Hui Lu ; Zhujun Zhang 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep07597
出版社：Springer Nature
摘要：Ultrafine copper nanoparticles (Cu NPs) within porous silica nanospheres (Cu@SiO₂) were prepared via a simple one-pot synthetic route in a reverse micelle system and characterized by SEM, TEM, EDX, XRD, N₂ adsorption-desorption, CO-TPD, XPS, and ICP methods. The characterized results show that ultrafine Cu NPs with diameter of around 2 nm are effectively embedded in the center of well-proportioned spherical SiO₂ NPs of about 25 nm in diameter. Compared to commercial SiO₂ supported Cu NPs, SiO₂ nanospheres supported Cu NPs, and free Cu NPs, the synthesized core-shell nanospheres Cu@SiO₂ exhibit a superior catalytic activity for the hydrolytic dehydrogenation of ammonia borane (AB, NH₃BH₃) and hydrazine borane (HB, N₂H₄BH₃) under ambient atmosphere at room temperature. The turnover frequencies (TOF) for the hydrolysis of AB and HB in the presence of Cu@SiO₂ nanospheres were measured to be 3.24 and 7.58 mol H₂ (mol Cu min)⁻¹, respectively, relatively high values for Cu nanocatalysts in the same reaction. In addition, the recycle tests show that the Cu@SiO₂ nanospheres are still highly active in the hydrolysis of AB and HB, preserving 90 and 85% of their initial catalytic activity even after ten recycles, respectively.