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Hydrothermal Synthesis of Cu@C Composite Spheres by a One‐Step Method and Their Use as Sacrificial Templates to Synthesize a CuO@SiO 2 Core–Shell Structure
Author(s) -
Cheng Yi,
Niu Xiaoyu,
Zhao Tieying,
Yuan Fulong,
Zhu Yujun,
Fu Honggang
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201300624
Subject(s) - thermogravimetric analysis , copper , chemistry , scanning electron microscope , transmission electron microscopy , composite number , nanoparticle , spheres , fourier transform infrared spectroscopy , chemical engineering , raman spectroscopy , catalysis , hydrothermal circulation , aqueous solution , nanotechnology , composite material , materials science , organic chemistry , physics , optics , astronomy , engineering
Cu@C composite spheres with copper nanoparticles dispersed in the carbonaceous matter have been synthesized by a one‐step hydrothermal method by using different copper salts mixed with an aqueous glucose solution. The spheres have been characterized by X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric–differential thermal analysis, inductively coupled plasma atomic emission spectrometry, Fourier transform infrared spectroscopy, and Raman spectrocopy. The results show that Cu(NO 3 ) 2 , CuSO 4 ,and CuCl 2 exhibit an accelerating effect on the size of the composite spheres, and microsized composites were obtained. However, a morphological change from irregular cubes and spheres to uniform spheres with a narrow size distribution of 340–400 nm was observed when cupric acetate [Cu(Ac) 2 ] was used. Interestingly, Cu 2 O, generated in situ from Cu(ac) 2 , plays an important role in the size of the composite spheres. Moreover, a CuO@SiO 2 core–shell structure has been synthesized by using the Cu@C composite spheres as a sacrificial template, and the CO + NO reaction was used as a probe reaction to evaluate its catalytic performance. CuO@SiO 2 exhibits excellent catalytic performance in the CO + NO reaction.