CdS的结构参数对其可见光分解水产氢性能的影响

摘要

采用水热/溶剂热法合成了球形、棒状和叶子状的CdS,并采用扫描电子显微镜(SEM)、X射线粉末衍射仪(XRD)、紫外-可见漫反射光谱(UV-vis DRS)、荧光光谱(PL)、比表面积及孔隙率分析仪(BET)等技术对其结构和光吸收特性进行了表征.考察了4种CdS光催化剂的可见光分解水产氢性能,并考察了CdS的结构参数对其活性的影响.结果表明,当Pt的负载量为1.2%(质量分数) 时,L-CdS产氢速率最高,为47.77 mmol·h-1·g-1.结构表征显示,L-CdS (002)晶面衍射峰强度特别强.(002)晶面是高指数晶面,比表面能大,这可能是其活性高的主要原因.紫外-可见漫反射光谱和荧光光谱结果也表明,L-CdS具有很好的可见光响应和较弱的荧光强度.%CdS photocatalysts with nanospheres, nanorods and nano/micro leaves were synthesized by hydrothermal or solvothermal method and subsequently characterized by SEM, XRD, UV-vis DRS, PL, and BET.The photocatalytic activity of CdS was tested.The effect of different structural parameters on CdS's activity for hydrogen production from water splitting under visible light was also investigated.Results show that the highest H2 production activity of Pt/CdS is 47.77 mmol·h-1·g-1 when the loading amount of Pt was 1.2%(mass fraction) and L-CdS was used.Powder X-ray diffraction (XRD) shows that L-CdS has the strong and sharp peaks in (002) facet which is a high index crystal facet and finally results in a high catalytic activity.UV-vis DRS and PL results show that L-CdS has good response to visible light and low fluorescence intensity.