Novel 3D flower-like Ag₂S/SnS₂ composites were fabricated by a hydrothermal and ion exchange method. Uniform Ag₂S quantum dots were homogeneously interspersed on 3D flower-like SnS₂. The samples were characterized through X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) analysis. As expected, the as-prepared Ag₂S quantum dot modified 3D flower-like SnS₂ composites exhibited enhanced photoelectrochemical (PEC) performance and photocatalytic activities. The photocurrent density of 3% 3D flower-like Ag₂S/SnS₂ at 2.0 V (vs. Ag/AgCl) (0.65 mA cm⁻²) was about 3.25 times higher than that (0.2 mA cm⁻²) of 3D flower-like SnS₂. The photocatalytic activity of 3D flower-like Ag₂S/SnS₂ composites was assessed through the degradation of methyl orange and the photocatalytic H₂ evolution performance under visible light irradiation. The coupling of SnS₂ and Ag₂S quantum dots could notably promote the photocatalytic activity. The experimental results indicated that 3% 3D flower-like Ag₂S/SnS₂ composites showed the best photocatalytic performance for the degradation of methyl orange. These composites also exhibited a high H₂ evolution rate of 574.7 μmol h⁻¹ g⁻¹ under visible light irradiation, approximately 5.57 times higher than that of pure 3D flower-like SnS₂. Based on the calculation, radical trapping tests and ESR, a plausible mechanism for increased photoactivity was proposed. This work provides experimental insight into the design of low-cost photocatalysts for highly efficient photodegradation and photocatalytic H₂-production.

中文翻译：

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用于光催化和光电化学应用的新型Ag ₂ S量子点修饰的3D花状SnS ₂复合材料

通过水热离子交换法制备了新颖的3D花状Ag ₂ S / SnS ₂复合材料。均匀的Ag ₂ S量子点均匀地散布在3D花状SnS _2上。通过X射线衍射（XRD），拉曼光谱，扫描电子显微镜（SEM），能量色散X射线光谱（EDS），透射电子显微镜（TEM），UV-Vis漫反射光谱（DRS）对样品进行表征，X射线光电子能谱（XPS）和光致发光（PL）分析。如预期的那样，制备的Ag ₂ S量子点修饰的3D花状SnS ₂复合材料表现出增强的光电化学（PEC）性能和光催化活性。3％3D花状Ag ₂ S / SnS ₂在2.0 V（相对于Ag / AgCl）（0.65 mA cm ^-2）的光电流密度比3D花（0.2 mA cm ^-2）的光电流密度高约3.25倍类SnS ₂。通过在可见光照射下甲基橙的降解和H _2的放出性能来评估3D花状Ag ₂ S / SnS ₂复合材料的光催化活性。SnS ₂和Ag ₂的偶联S个量子点可以显着提高光催化活性。实验结果表明，3％3D花状Ag ₂ S / SnS ₂复合材料对甲基橙的降解表现出最好的光催化性能。这些复合材料在可见光照射下还表现出574.7μmolh ^-1 g ^-1的高H ₂释放速率，是纯3D花状SnS _2的约5.57倍。基于计算，自由基俘获测试和ESR，提出了增加光活性的合理机制。这项工作为高效光降解和光催化H ₂的低成本光催化剂的设计提供了实验性的见识。-生产。