石墨烯-ZnIn2S4纳米复合微球的制备及光催化产氢活性

doi:10.15541/jim20140591

摘要/Abstract

摘要：

采用光催化还原法制备了石墨烯-ZnIn₂S₄纳米复合微球。采用XRD、SEM、TEM、FT-IR、XPS和DRS等手段对样品进行表征, 结果表明, 经过光催化还原处理后氧化石墨被还原成石墨烯, ZnIn₂S₄纳米微球负载在石墨烯表面。光催化产氢的实验结果表明, 当石墨烯含量为2.0wt%、光催化还原时间为24 h时, 石墨烯-ZnIn₂S₄纳米复合微球在模拟太阳光下产氢量达到1540.8 μmol, 是纯ZnIn₂S₄纳米微球的9.8倍。增强光催化性能的原因归结为石墨烯在复合光催化剂中起到了电子快速传输作用, 同时还对纳米复合微球光催化产氢反应机理进行了分析讨论。

关键词: 光催化还原法, ZnIn2S4纳米微球, 石墨烯, 产氢

Abstract:

Graphene-ZnIn₂S₄ nanocomposite spheres were prepared via a facile photocatalytic reduction method. The samples were characterized by XRD, SEM, TEM, FT-IR, XPS and DRS. The results showed that the graphene oxide was reduced to graphene and ZnIn₂S₄ nanospheres were loaded on the surface of graphene sheets through a photocatalytic reduction process. The experimental results for photocatalytic hydrogen evolution of the samples indicated that the amount of evoluted H₂ under simulated sunlight irradiation using graphene-ZnIn₂S₄ nanocomposite spheres was 1540.8 μmol, 9.8 times of the pure ZnIn₂S₄ nanospheres, under optimal technological condition with the graphene content of 2.0wt% for 24 h. The enhanced performance can be attributed to the graphene which effectively promoted the transfer of photogenerated electrons. Furthermore, a detailed photocatalytic hydrogen evolution mechanism of graphene-ZnIn₂S₄ nanocomposite spheres was investigated.

Key words: photocatalytic reduction method, ZnIn2S4 nanospheres, graphene, hydrogen evolution

中图分类号:

TQ174

周民杰, 张娜, 侯朝辉. 石墨烯-ZnIn₂S₄纳米复合微球的制备及光催化产氢活性[J]. 无机材料学报, 2015, 30(7): 713-718.

ZHOU Min-Jie, ZHANG Na, HOU Zhao-Hui. Preparation and Photocatalytic Activity for Hydrogen Evolution of Graphene-ZnIn₂S₄ Nanocomposite Spheres[J]. Journal of Inorganic Materials, 2015, 30(7): 713-718.

图/表 8

图1 ZnIn2S4与GE-ZnIn2S4纳米复合微球的XRD图谱

Fig. 1 XRD patterns of ZnIn2S4 and GE- ZnIn2S4 nanocomposite spheres

图2 ZnIn2S4与GE-ZnIn2S4纳米复合微球的SEM与TEM照片

Fig. 2 SEM (a) and TEM (b) images of ZnIn2S4 nanospheres and SEM (c) and TEM (d) images of GE-Zn-In2S4 nanocomposite spheres

图3 GO与GE-ZnIn2S4纳米复合微球的红外光谱图

Fig. 3 FT-IR spectra of GO and GE-ZnIn2S4 nanocomposite spheres

图4 GO的C1s(a)、GE-ZnIn2S4中GE的C1s(b), Zn2p(c)和In3d(d)的XPS图谱

Fig. 4 C1s XPS spectra of GO (a) and C1s (b), Zn2p (c) and In3d (d) XPS spectra of GE-ZnIn2S4 nanocomposite spheres

图5 ZnIn2S4与GE-ZnIn2S4纳米复合微球的紫外-可见吸收光谱

Fig. 5 UV-Vis DRS spectra of ZnIn2S4 and GE-ZnIn2S4 nanocomposites spheres

图6 GE-ZnIn2S4中石墨烯含量对产氢活性的影响

Fig. 6 Effect of GE contents in GE-ZnIn2S4 on the amount of evoluted H2

图7 光催化还原时间对产氢活性的影响

Fig. 7 Effect of photocatalytic reduction time on the amount of evoluted H2

图8 GE-ZnIn2S4纳米复合微球的光催化产氢反应机理

Fig. 8 Photocatalytic hydrogen evolution reaction mechanism of GE-ZnIn2S4 nanocomposite spheres

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石墨烯-ZnIn₂S₄纳米复合微球的制备及光催化产氢活性

Preparation and Photocatalytic Activity for Hydrogen Evolution of Graphene-ZnIn₂S₄ Nanocomposite Spheres

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