Facile one-pot solvothermal method to synthesize sheet-on-sheet reduced graphene oxide (RGO)/ZnIn2S4 nanocomposites with superior photocatalytic performance.
Facile one-pot solvothermal method to synthesize sheet-on-sheet reduced graphene oxide (RGO)/ZnIn2S4 nanocomposites with superior photocatalytic performance.
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DOI：
10.1021/am5004415
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发表时间：
2014-02
影响因子：
9.5
通讯作者：
L. Ye;Jinlong Fu;Zhen Xu;Rusheng Yuan;Z. Li
中科院分区：
文献类型：
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作者：
L. Ye;Jinlong Fu;Zhen Xu;Rusheng Yuan;Z. Li
以N，N-二甲基甲酰胺（DMF）和乙二醇（EG）为溶剂，采用一锅法制备了具有片叠片形貌的高还原性氧化石墨烯（RGO）/ZnIn 2S 4纳米复合材料。同时实现了GO（氧化石墨烯）还原为RGO和在高度还原的RGO上形成ZnIn 2S 4纳米片。研究了溶剂对产物形貌的影响，并提出了形成机理。采用X射线粉末衍射（XRD）、傅里叶变换红外光谱（FT-IR）、拉曼光谱（Raman）、X射线光电子能谱（XPS）、N2吸附BET比表面积、紫外-可见漫反射光谱（DRS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、高分辨透射电子显微镜（HRTEM）等对所制备的RGO/ZnIn 2S 4纳米复合材料进行了表征。研究了RGO/ZnIn 2S 4纳米复合材料在可见光照射下的光催化析氢活性。在可见光照射下，RGO/ZnIn 2S 4纳米复合材料的光催化析氢活性明显增强，其中以1.0wt%RGO/ZnIn 2S 4纳米复合材料的光催化活性最高。RGO/ZnIn 2S 4纳米复合材料的上级光催化性能优于RGO/ZnIn 2S 4纳米复合材料，这是由于RGO具有高度还原性，并与ZnIn 2S 4纳米片有很强的相互作用。纳米复合材料中ZnIn 2S 4纳米片与RGO之间的强相互作用促进了电子从ZnIn 2S 4向RGO的转移，RGO作为良好的电子受体、介体以及析氢助催化剂。该研究为开发RGO掺杂的纳米复合光催化剂提供了一定的指导。
Highly reductive RGO (reduced graphene oxide)/ZnIn2S4 nanocomposites with a sheet-on-sheet morphology have been prepared via a facile one-pot solvothermal method in a mixture of N,N-dimethylformamide (DMF) and ethylene glycol (EG) as solvent. A reduction of GO (graphene oxide) to RGO and the formation of ZnIn2S4 nanosheets on highly reductive RGO has been simultaneously achieved. The effect of the solvents on the morphology of final products has been investigated and the formation mechanism was proposed. The as-prepared RGO/ZnIn2S4 nanoscomposites were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), N2-adsorption BET surface area, UV-vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM). The photocatalytic activity for hydrogen evolution under visible light irradiations over the as-prepared RGO/ZnIn2S4 nanocomposites has been investigated. The as-prepared RGO/ZnIn2S4 nanocomposites show enhanced photocatalytic activity for hydrogen evolution under visible light irradiations and an optimum photocatalytic activity is observed over 1.0 wt % RGO incorporated ZnIn2S4 nanocomposite. The superior photocatalytic performance observed over RGO/ZnIn2S4 nanocomposites can be ascribed to the existence of highly reductive RGO which has strong interactions with ZnIn2S4 nanosheets. The existence of the strong interaction between ZnIn2S4 nanosheets and RGO in the nancomposites facilitates the electron transfer from ZnIn2S4 to RGO, with the latter serving as a good electron acceptor, mediator as well as the co-catalyst for hydrogen evolution. This study can provide some guidance for us in the developing of RGO-incorporated nanocomposite photocatalysts.