Jin Zhiliang, Liu Yang, Hao Xuqiang
School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, PR China; Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, PR China; Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, PR China.
School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, PR China; Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, PR China; Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, PR China.
J Colloid Interface Sci. 2020 May 1;567:357-368. doi: 10.1016/j.jcis.2020.02.024. Epub 2020 Feb 11.
ZnCdS solid solutions have been extensively studied due to their excellent photocatalytic hydrogen evolution performance. The change of the molar ratio of precursors affects the morphology and structure of ZnCdS, with the subsequent influence on the separation of photogenerated electron-hole pairs and the hydrogen production ability. The effect of the amount of nonmetallic elements on the photocatalytic activity has been scarcely explored. In this work, the morphology of ZnCdS is regulated by varying the amount of thioacetamide as S precursor. The structure of the samples is thoroughly analyzed by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and Brunauer-Emmett-Teller analysis. Their optical properties, photocatalytic hydrogen evolution ability, and photoelectrochemical performance are evaluated. Upon increasing the amount of thioacetamide, the crystallinity improves, the ZnCdS nanorods self-assemble into nanoflowers, and the number of defects decreases. The highest photocatalytic activity is achieved for a (Zn + Cd):S molar ratio of 1:3.5. Moreover, the photocatalyst exhibits excellent stability after six cycles. The one-dimensional nanorod structure contributes to the formation of a space charge region that drives the charge carriers along the nanorods. The self-assembled ZnCdS nanoflowers provide extra channels for the charge transfer, improving the separation of electron-hole pairs.
硫化锌镉固溶体因其优异的光催化析氢性能而受到广泛研究。前驱体摩尔比的变化会影响硫化锌镉的形貌和结构，进而影响光生电子 - 空穴对的分离以及产氢能力。非金属元素用量对光催化活性的影响鲜有研究。在本工作中，通过改变硫代乙酰胺作为硫前驱体的用量来调控硫化锌镉的形貌。采用X射线衍射、透射电子显微镜、X射线光电子能谱和布鲁诺尔 - 埃米特 - 泰勒分析对样品结构进行了全面分析。评估了它们的光学性质、光催化析氢能力和光电化学性能。随着硫代乙酰胺用量的增加，结晶度提高，硫化锌镉纳米棒自组装成纳米花，缺陷数量减少。当(Zn + Cd):S摩尔比为1:3.5时，实现了最高的光催化活性。此外，该光催化剂在六个循环后表现出优异的稳定性。一维纳米棒结构有助于形成空间电荷区，驱动载流子沿纳米棒移动。自组装的硫化锌镉纳米花为电荷转移提供了额外的通道，改善了电子 - 空穴对的分离。
