Metallic 1T-LixMoS2 co-catalyst enhanced photocatalytic hydrogen evolution over ZnIn2S4 floriated microspheres under visible light irradiation,Catalysis Science & Technology

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Metallic 1T-LixMoS2 co-catalyst enhanced photocatalytic hydrogen evolution over ZnIn2S4 floriated microspheres under visible light irradiation
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-01-29 00:00:00 , DOI: 10.1039/c7cy02456h
Junying Liu _{1,

2,

3,

4} , Wenjian Fang _{1,

2,

3,

4} , Zhidong Wei _{1,

2,

3,

4} , Zhen Qin _{1,

2,

3,

4} , Zhi Jiang _{1,

2,

3,

4} , Wenfeng Shangguan _{1,

2,

3,

4}

Affiliation

Lithium intercalated 1T allotropes of molybdenum disulfide/zinc indium sulfide (1T-Li_xMoS₂/ZnIn₂S₄) composites were synthesized using a two-step hydrothermal method. The as-prepared samples were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, ultraviolet-visible diffuse reflectance absorption spectra, photoluminescence emission spectra and Raman spectra. The results indicate that the lithium intercalation reaction transforms the MoS₂ crystal from the hexagonal structure (2H phase) to the trigonal 1T phase. By introducing metallic 1T-Li_xMoS₂ as a co-catalyst, the photocatalytic hydrogen (H₂) evolution activity of the ZnIn₂S₄ microspheres is significantly enhanced under visible light irradiation. The enhanced photocatalytic activity is mainly attributed to the fact that the metallic 1T-Li_xMoS₂ promotes the efficient separation of the photoexcited electrons and the holes of ZnIn₂S₄ microspheres because of its high electrical conductivity and high densities of the active sites. The photoexcited electrons of ZnIn₂S₄ microspheres can not only transfer to the edge sites of 1T-Li_xMoS₂, but also to the basal plane active sites of 1T-Li_xMoS₂. Furthermore, the photocatalytic activity is dependent on the content of 1T-Li_xMoS₂ in the composites. The 2.0 wt% 1T-Li_xMoS₂/ZnIn₂S₄ sample shows the highest H₂ production rate of 332.4 μmol h⁻¹, which is 2.4 times higher than that of bare ZnIn₂S₄ and 1.3 times higher than that of 2.0 wt% 2H-MoS₂/ZnIn₂S₄, and it remains stable even after three photocatalytic cycling tests.

中文翻译：

金属1T-Li _x MoS ₂助催化剂在可见光照射下在ZnIn ₂ S ₄多孔微球上增强光催化氢的释放

采用两步水热法合成了二硫化钼/硫化锌铟（1T-Li _x MoS ₂ / ZnIn ₂ S ₄）复合材料的锂插层1T同素异形体。使用X射线衍射，扫描电子显微镜，透射电子显微镜，X射线光电子能谱，紫外可见漫反射吸收光谱，光致发光发射光谱和拉曼光谱来表征所制备的样品。结果表明，锂嵌入反应将MoS ₂晶体从六方结构（2H相）转变为三角1T相。通过引入金属1T-Li _x MoS ₂作为助催化剂，ZnIn ₂ S ₄微球在可见光照射下的光催化氢（H ₂）析出活性显着增强。增强的光催化活性主要归因于金属1T-Li _x MoS ₂由于其高电导率和高活性位点密度而促进了光激发电子与ZnIn ₂ S ₄微球空穴的有效分离。ZnIn ₂ S ₄微球的光激发电子不仅可以转移到1T-Li _x MoS ₂的边缘位置，但也到1T-Li _x MoS ₂的基面活动位点。此外，光催化活性取决于复合物中1T-Li _x MoS ₂的含量。2.0 wt％1T-Li _x MoS ₂ / ZnIn ₂ S ₄样品的最高H ₂生产率为332.4μmolh ^-1，是裸ZnIn ₂ S _4的2.4倍，是裸ZnIn ₂ S _4的1.3倍。 2.0wt％2H-MoS ₂ / ZnIn ₂ S ₄，即使经过三个光催化循环测试，仍保持稳定。

更新日期：2018-01-29

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