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Bimetallic Au–Ni Nanoparticles Embedded in SiO 2 Nanospheres: Synergetic Catalysis in Hydrolytic Dehydrogenation of Ammonia Borane
Author(s) -
Jiang HaiLong,
Umegaki Tetsuo,
Akita Tomoki,
Zhang XinBo,
Haruta Masatake,
Xu Qiang
Publication year - 2010
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200902829
Subject(s) - ammonia borane , bimetallic strip , catalysis , dehydrogenation , nickel , cyclohexane , nanoparticle , materials science , inorganic chemistry , micelle , hydrolysis , aqueous solution , colloidal gold , ammonia , chemistry , chemical engineering , nuclear chemistry , nanotechnology , organic chemistry , metallurgy , engineering
Gold–nickel nanoparticles (NPs) of 3–4 nm diameter embedded in silica nanospheres of around 15 nm have been prepared by using [Au(en) 2 Cl 3 ] and [Ni(NH 3 ) 6 Cl 2 ] as precursors in a NP‐5/cyclohexane reversed‐micelle system, and by in situ reduction in an aqueous solution of NaBH 4 /NH 3 BH 3 . Compared with monometallic Au@SiO 2 and Ni@SiO 2 , the as‐synthesized Au–Ni@SiO 2 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 H 2 , 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.