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首页> 外文期刊>Catalysis science & technology >Ternary mesoporous WO3/Mn3O4/N-doped graphene nanocomposite for enhanced photocatalysis under visible light irradiation
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Ternary mesoporous WO3/Mn3O4/N-doped graphene nanocomposite for enhanced photocatalysis under visible light irradiation

机译：三元介孔WO3/MN3O4/N掺杂石墨烯纳米复合材料，可在可见光照射下增强光催化

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摘要

A novel ternary nanocomposite comprising mesoporous WO3, Mn3O4 nanoparticles and N-doped graphene was prepared by a one-pot deposition method. The nanocomposite was characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. The results demonstrated that the Mn3O4 nanoparticles had been successfully hybridized with the mesoporous WO3 and the WO3/Mn3O4 hybrid was well dispersed on the surface of N-doped graphene with superior interactions. The nanocomposite exhibits higher photocatalytic activity for water oxidation than the individual mesoporous WO3 and WO3/Mn3O4 catalysts. The amount of oxygen evolution from the optimized heterostructural photocatalyst (1.5 wt% Mn3O4 and 2 wt% N-doped graphene) was 294 mu mol g(-1), which was about 3.6 times as high as that from m-WO3. The heterostructure formed between Mn3O4 and m-WO3 enhances photogenerated electron/hole transfer and restrains the recombination of charges greatly. N-doped graphene in the nanocomposite acting as an excellent electron acceptor and mediator also contributes to the increase in photocatalytic performance by promoting the separation and transfer of photogenerated charges. This study suggests a promising method to enhance photocatalytic activity by combining the heterostructural WO3/Mn3O4 hybrid with graphene in a ternary system.
机译：一种新型的三元纳米复合材料，包括介孔WO3，MN3O4纳米颗粒和N掺杂的石墨烯，通过一锅沉积法制备。纳米复合材料的特征是X射线衍射，透射电子显微镜，扫描电子显微镜，拉曼光谱和X射线光电子光谱。结果表明，MN3O4纳米颗粒已与介孔WO3成功杂交，并且WO3/MN3O4混合体很好地分散在具有出色相互作用的N掺杂石墨烯的表面上。纳米复合材料比单个介孔WO3和WO3/MN3O4催化剂具有更高的水氧化光催化活性。从优化的异质结构光催化剂（1.5 wt％MN3O4和2 wt％n掺杂的石墨烯）中的氧演化量为294 Mu mol G（-1），大约是M-WO3的3.6倍。 MN3O4和M-WO3之间形成的异质结构增强了光生的电子/孔转移，并极大地限制了电荷的重组。纳米复合材料中的N掺杂石墨烯充当出色的电子受体和介体，还通过促进光晶电荷的分离和转移来促进光催化性能的提高。这项研究提出了一种有前途的方法来通过将异构结构WO3/MN3O4混合体与三元系统中的石墨烯相结合，从而增强光催化活性。

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