期刊
MARINE POLLUTION BULLETIN
卷 85, 期 2, 页码 696-699出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2014.02.011
关键词
Core-shell; Yolk-shell; Nanoreactors; H-2 fuel; Seawater; Photocatalysis
Novel photocatalysts i.e., metallic nickel and zinc oxide nanoparticles embedded in the carbon-shell ((Ni-ZnO)@C) have been used for photocatalytic splitting of seawater to generate H-2. The (Ni-ZnO)@C core-shell nanoparticles having the Zn/Ni ratios of 0-3 were prepared by carbonization of Ni2+- and Zn2+-beta-cyclodextrin at 673 K for 2 h. To increase the collision frequency of water and photoactive sites within the carbon-shell, Ni and ZnO are partially etched from the (Ni-ZnO)@C core-shell to form yolk-shell nanoparticles with a H2SO4 solution (2 N). By X-ray diffraction spectroscopy, mainly Ni and ZnO crystallites are observed in the core- and yolk-shell nanoparticles. The sizes of the Ni and ZnO in the (Ni-ZnO)@C nanoreactors are between 7 and 23 nm in diameters determined by TEM and small angel scattering spectroscopy. Under a 5-h UV-Vis light irradiation, 5.01 mu mol/hg(cat) of H-2 are yielded from photocatalytic splitting of seawater effected by (Ni-ZnO)@C nanoreactors. (C) 2014 Elsevier Ltd. All rights reserved.
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