In this paper,CuO nano-spheres were successfully synthesized by immersing-annealing technique with the reproducible,low-cost,porous sawdust and copper compound as raw materials.The obtained samples were characterized ...In this paper,CuO nano-spheres were successfully synthesized by immersing-annealing technique with the reproducible,low-cost,porous sawdust and copper compound as raw materials.The obtained samples were characterized using X-ray diffraction(XRD),transmission electron microscopy(TEM) and high resolution transmission electron microscopy(HRTEM).The results indicated that the as-synthesized sample was CuO with monoclinic phase,the sample exhibited a spherical structure with average diameter of ca.12nm.In addition,the sample dispersed well and there was no obvious hard aggromeration.展开更多
Herein,we successfully prepare highly dispersed and uniform small nano-size nickel nanoparticles embedded on core-shell carbon spheres by confined-deposition method.The mesoporous silica layer containing surfactant co...Herein,we successfully prepare highly dispersed and uniform small nano-size nickel nanoparticles embedded on core-shell carbon spheres by confined-deposition method.The mesoporous silica layer containing surfactant coated on the surface of the polymer sphere provides confined space and effectively controls the growth of nickel nanoparticles during pyrolysis.At the same time,the introduction of nickel species has an impact on structure of the obtained carbon spheres,and it can promote the deposition of carbon to realize the adjustment from hollow to core-shell and then to solid spheres.Owing to the uniform distribution of Ni nanoparticles with small size,mesoporous structure,N-doping groups,high specified surface areas,and core-shell structure,the obtained catalyst shows exciting ability for the production of CO by reduction of CO_(2)with a maximum CO Faradaic efficiency of 98%,indicating its promising prospect in electro-reduction of CO_(2).展开更多
文摘In this paper,CuO nano-spheres were successfully synthesized by immersing-annealing technique with the reproducible,low-cost,porous sawdust and copper compound as raw materials.The obtained samples were characterized using X-ray diffraction(XRD),transmission electron microscopy(TEM) and high resolution transmission electron microscopy(HRTEM).The results indicated that the as-synthesized sample was CuO with monoclinic phase,the sample exhibited a spherical structure with average diameter of ca.12nm.In addition,the sample dispersed well and there was no obvious hard aggromeration.
基金financially supported by the Natural Science Foundation of Hebei(Nos.B02020208088,H2020206514 and B2021208074)S&T Program of Hebei(Nos.20544401D,20314401D,206Z4406G,21314402D,22344402D,22373709D,22284601Z and 21344601D)Tianjin Science and Technology Project(No.19YFSLQY00070)。
文摘Herein,we successfully prepare highly dispersed and uniform small nano-size nickel nanoparticles embedded on core-shell carbon spheres by confined-deposition method.The mesoporous silica layer containing surfactant coated on the surface of the polymer sphere provides confined space and effectively controls the growth of nickel nanoparticles during pyrolysis.At the same time,the introduction of nickel species has an impact on structure of the obtained carbon spheres,and it can promote the deposition of carbon to realize the adjustment from hollow to core-shell and then to solid spheres.Owing to the uniform distribution of Ni nanoparticles with small size,mesoporous structure,N-doping groups,high specified surface areas,and core-shell structure,the obtained catalyst shows exciting ability for the production of CO by reduction of CO_(2)with a maximum CO Faradaic efficiency of 98%,indicating its promising prospect in electro-reduction of CO_(2).
