Synthesis of ZnO@ZnS–Bi2S3 core–shell nanorod grown on reduced graphene oxide sheets and its enhanced photocatalytic performance
Synthesis of ZnO@ZnS–Bi2S3 core–shell nanorod grown on reduced graphene oxide sheets and its enhanced photocatalytic performance
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DOI：
10.1039/c4ta00696h
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发表时间：
2014-05
影响因子：
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通讯作者：
Wang Xitao;Lv Rong;W. Kang
中科院分区：
文献类型：
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作者：
Wang Xitao;Lv Rong;W. Kang
采用水热法和离子交换法制备了ZnO@ ZnS-Bi 2S 3核壳纳米棒，并将其固定在还原氧化石墨烯（RGO）上。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、拉曼光谱（Raman）、X射线光电子能谱（XPS）、紫外-可见漫反射光谱（UV-Vis）、室温光致发光谱（PL）等手段对复合材料进行了表征，并在300 W氙灯照射下考察了复合材料的光催化析氢性能。与RGO/ZnO纳米棒和RGO/ZnO@ZnS核壳纳米棒相比，RGO/ZnO @ ZnS-Bi 2S 3核壳纳米棒在可见光区具有较强的光吸收，并具有较高的光催化活性。在最佳的Bi 2S 3/ZnS摩尔比下，光催化产氢速率达到310 μmol h−1 g−1。复合材料性能的显著提高可归因于增加的光吸收和有效的电荷分离。
ZnO@ZnS–Bi2S3 core–shell nanorods anchored on reduced graphene oxide (RGO) were prepared by combining the hydrothermal treatment and ion exchange technique. The nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction, Raman, X-ray photoelectron spectroscopy (XPS), UV-Vis diffusion reflectance spectroscopy, room-temperature photoluminescence spectra (PL), and their photocatalytic performance for H2 evolution under 300 W Xenon lamp irradiation was evaluated. The as-prepared RGO/ZnO@ZnS–Bi2S3 core–shell nanorods display a wide and strong photo absorption in the visible region and exhibit a higher photocatalytic activity for H2 evolution from the glycerol water mixtures as compared with the RGO/ZnO nanorods and RGO/ZnO@ZnS core–shell nanorods. Under the optimal Bi2S3/ZnS molar ratio in the shell layer, the highest photocatalytic hydrogen production rate of 310 μmol h−1 g−1 is observed. The highly improved performance of the composites can be ascribed to the increased light absorption and efficient charge separation.