Fabricate Globular Flower-like CuS/CdIn2S4/ZnIn2S4 with High Visible Light Response via Microwave-assisted One–step Method and Its Multipathway Photoelectron Migration Properties for Hydrogen Evolution and Pollutant Degradation

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• 作者：Xi Chen ; Li Li ; Wenzhi Zhang ; Yixuan Li ; Qiang Song ; Li Dong
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：December 5, 2016
• 年：2016
• 卷：4
• 期：12
• 页码：6680-6688
• 全文大小：744K
• ISSN：2168-0485

文摘

The photocatalyst CuS/CdIn₂S₄/ZnIn₂S₄ with attractive visible light absorption was prepared by a microwave-assisted one-step method and then characterized by XRD, XPS, UV–vis/DRS, N₂ adsorption–desorption, SEM, TEM, and HRTEM tests. The results show that there are two kinds of crystal structures, hexagonal and cubic phase, in the product. Moreover, the composite has an absorption edge as high as 670 nm with a high visible light response. In addition, the composite possesses an excellent surface area of 239.3 m²/g, displays a favorable globular flower-like surface morphology, and consists mostly of three disparate shapes of crystals in the microstructure. Compared to heterogeneous ZnIn₂S₄ and P25, as-prepared composite demonstrates the greatest photocatalytic activity under simulated sunlight and visible light by methyl orange degradation. Together with Pt loading as a cocatalyst, hydrogen was achieved over CuS/CdIn₂S₄/ZnIn₂S₄ in Na₂S–Na₂SO₃ aqueous solution, leading to a hydrogen production rate of 358.4 μmol·h^–1·g^–1 under simulated sunlight and a high hydrogen production rate of 233.9 μmol·h^–1·g^–1 under visible light (λ > 420 nm). Additionally, the related formulas were utilized to calculate the semiconductor energy band configuration and speculate on the possible photoreaction mechanism of CuS/CdIn₂S₄/ZnIn₂S₄. Finally, the effect of multipathway photoinduced charge migration during photocatalysis process was explained.