Enhanced Visible Light-Driven Photocatalytic Hydrogen Evolution and Stability for Noble Metal-Free MoS2/Zn0.5Cd0.5S Heterostructures with W/Z Phase Junctions
Enhanced Visible Light-Driven Photocatalytic Hydrogen Evolution and Stability for Noble Metal-Free MoS2/Zn0.5Cd0.5S Heterostructures with W/Z Phase Junctions
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DOI：
10.1016/j.apsusc.2022.152770
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发表时间：
2022-02
影响因子：
6.7
通讯作者：
Yuhao Zhang;Dingze Lu;Hang Li;Kiran Kumar Kondamareddy;Hongmei Wang;Boyu Zhang;J. Wang;Qiong Wu;Yimei Zeng;Xinyu Zhang;Min-Yun Zhou;N. D;Hongjuan Hao;Huanyu Pei;H. Fan
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文献类型：
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作者：
Yuhao Zhang;Dingze Lu;Hang Li;Kiran Kumar Kondamareddy;Hongmei Wang;Boyu Zhang;J. Wang;Qiong Wu;Yimei Zeng;Xinyu Zhang;Min-Yun Zhou;N. D;Hongjuan Hao;Huanyu Pei;H. Fan
采用简单的水热法制备了一系列不含贵金属离子的复合异质结-MoS 2/Zn0.5Cd0.5S光催化剂。MoS 2/Zn0.5Cd0.5S复合材料的X射线衍射谱显示出三个较强的衍射峰，从而解释了纤维锌矿（CdS）和锌尖晶石（ZnS）以纤维锌矿/锌尖晶石相结的形式存在。显微结构研究表明，样品具有典型的立方晶体结构，MoS 2以花状结构均匀包裹在Zn 0. 5Cd 0. 5S颗粒周围。X射线光电子能谱、傅里叶变换红外光谱和紫外-可见漫反射光谱等方法证实了Zn 0. 5Cd 0. 5S纳米粒子与MoS 2纳米花之间形成了具有优异光响应能力的异质结。荧光光谱、表面光电流谱和电化学研究表明，Zn 0. 5Cd 0. 5S纳米粒子与特定量的MoS 2纳米花的复合可以有效地抑制复合材料中光生载流子的复合.因此，负载3%MoS2的Zn0.5Cd0.5S纳米粒子具有最佳的产氢性能（388.2 μmol/h），是Zn0.5Cd0.5S纳米粒子的1.3倍。一个似乎合理的机制，为增强超导提供了在异质结辅助有效分离的电荷载体，由照射产生。
A series of composite heterojunction-MoS2/Zn0.5Cd0.5S photocatalysts free of noble metal ions was prepared using a simple hydrothermal method. The X-ray diffraction spectra of the MoS2/Zn0.5Cd0.5S composites exhibit three strong intensive peaks, thereby explaining the existence of wurtzite (CdS) and zinc blende (ZnS) in the form of the wurtzite/zinc-blende phase junctions. Microstructural studies indicate that the sample displays a typical cubic crystal structure and that the MoS2with flower-like structure uniformly wraps the granular Zn0.5Cd0.5S. X-ray photoelectron, Fourier transform infrared, and UV–Vis diffuse reflectance spectroscopic methods confirm that the heterojunction, which possesses outstanding photoresponse ability, is constructed between Zn0.5Cd0.5S nanoparticles and MoS2nanoflowers. The fluorescence spectroscopy, surface photocurrent spectroscopy, and electrochemical studies indicate that Zn0.5Cd0.5S nanoparticles with specific amount of MoS2nanoflowers can effectively suppress the recombination of photoinduced charge carriers of the composites. Therefore, pristine Zn0.5Cd0.5S nanoparticles loaded with 3%MoS2exhibit optimum performance of hydrogen production (388.2 μmol/h), which is 1.3 times that of pristine Zn0.5Cd0.5S nanoparticles. A plausible mechanism for enhanced photocatalysis is provided in terms of the heterojunction assisted effective separation of charge carriers that are generated by irradiation.