Preparation of a MWCNTs/ZnIn2S4 composite and its enhanced photocatalytic hydrogen production under visible-light irradiation
Preparation of a MWCNTs/ZnIn2S4 composite and its enhanced photocatalytic hydrogen production under visible-light irradiation
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DOI：
10.1039/c1dt11308a
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发表时间：
2012-01-01
影响因子：
4
通讯作者：
Zhang, Xiaohu
中科院分区：
文献类型：
--
作者：
Chai, Bo;Peng, Tianyou;Zhang, Xiaohu
采用水热法制备了多壁碳纳米管(MWCNTs)/硫化锌复合材料，并将其用于可见光(波长420 nm)下的制氢反应。用X射线衍射仪(XRD)、热重-差示扫描量热仪(TG-DSC)、场发射扫描电子显微镜(FESEM)、高分辨透射电子显微镜(HRTEM)、能量色散X射线能谱(EDS)、X射线光电子能谱(XPS)、紫外-可见漫反射吸收光谱(DRS)、傅立叶变换红外光谱(FTIR)和光致发光光谱(PL)对MWCNTs/ZnIn2S4复合材料进行了表征。结果表明，多壁碳纳米管嵌入到了花纹结构的硫化锌微球的内部。考察了MWCNTs/ZnIn2S4复合比例对光催化制氢活性的影响。结果表明，在420 nm光照下，3wt%的MWCNTs/ZnIn2S4复合材料具有最高的光催化产氢效率，表观量子效率高达23.3%。本复合材料的光活性显著提高源于其各组分的本征性质的协同效应。提出了MWCNTs/ZnIn2S4复合材料作为光催化剂催化析氢的可能机理。
Multiwalled carbon nanotubes (MWCNTs) and ZnIn2S4 composites were prepared by a facile hydrothermal method, which was used for hydrogen production under visible-light (lambda >= 420 nm) irradiation. The obtained MWCNTs/ZnIn2S4 composites were characterized by X-ray diffraction (XRD), thermogravimetric and differential scanning calorimetry analyses (TG-DSC), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance absorption spectra (DRS), Fourier transform IR spectroscopy (FTIR) and Photoluminescence spectra (PL). It was found that the MWCNTs were embedded into the interior of floriated ZnIn2S4 microspheres. The effects of the composite ratio in the MWCNTs/ZnIn2S4 on the photocatalytic activity for hydrogen production were investigated. The results show that the 3 wt% MWCNTs/ZnIn2S4 composite reaches its maximum photocatalytic hydrogen production efficiency with an apparent quantum efficiency as high as 23.3% under 420 nm light irradiation. The significantly enhanced photoactivity for the present composite originates from the synergetic effect of its component intrinsic properties. A possible mechanism of the MWCNTs/ZnIn2S4 composite as a photocatalyst for H-2 evolution was proposed.