Cadmium Sulfide Inverse Opal for Photocatalytic Hydrogen Production
Cadmium Sulfide Inverse Opal for Photocatalytic Hydrogen Production
复制标题
用于光催化制氢的硫化镉反蛋白石
DOI：
10.3866/pku.whxb201803014
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Su Baolian
中科院分区：
文献类型：
--
作者：
Zhang Ruolan;Wang Chao;Chen Hao;Zhao Heng;Liu Jing;Li Yu;Su Baolian
基于可见光的光催化技术是一种将太阳能转化为化学能、解决环境污染和能源短缺等全球性问题的有效而有前途的策略。CdS作为一种可见光响应的半导体材料，由于其合成简单、原料丰富、具有合适的禁带结构，被广泛应用于发光和光致发光领域。反蛋白石（inverseopal，IO）结构属于光子晶体结构，具有独特的三维有序的宏-介孔结构，可以调节入射光的传播方向，提高光催化性能。因此，IO在嵌入式系统中的应用引起了广泛的关注。本文采用CdS纳米晶与聚（苯乙烯-甲基丙烯酸甲酯-甲基丙烯酸3-磺丙酯，钾盐）（P（St-MMA-SPMAP））乳液共组装制备了CdS IO光子晶体薄膜。该方法简单且可以快速制备大尺寸光子晶体薄膜，因此得到广泛应用。通过改变聚合物的直径来调节IO结构的孔径。采用扫描电子显微镜（SEM）、X射线衍射（XRD）、紫外-可见吸收光谱（UV-Vis）和反射光谱对IO结构进行了表征。在可见光（λ ≥ 420 nm）照射下，通过光催化分解水评价了3种样品的光催化性能。在可见光照射下，以310 nm P（St-MMA-SPMAP）为模板制备的CdS IO薄膜（CdS-310）的光催化产氢速率是CdS纳米粒子（CdS-NPs）的2倍。这种光催化性能的提高归因于IO光子晶体的分级多孔结构。一方面，IO结构增加了光催化材料中光子的传播，提高了太阳光的利用率。另一方面，该结构有利于分子的传输和吸附。此外，IO结构由纳米颗粒组成，为光催化反应提供了更多的活性位点。
: Photocatalysis based on visible light is an efficient and promising strategy to convert solar energy into chemical energy and solve the global issues of environmental pollution and energy shortages. CdS, as a visible light responsive semiconductor material, is widely used in photocatalysis and photoluminescence because of its simple synthesis, abundant raw materials, and appropriate bandgap structure. The inverse opal (IO) structure belonging to photonic crystal structure with unique three-dimensionally ordered macro-mesopore, which can tune the propagation direction of incident light and improve photocatalytic performance. Therefore, IO has attracted extensive attention for photocatalysis applications. Herein, CdS IO photonic crystal films were prepared by co-assembly using CdS nanocrystals and poly(styrene-methyl methacrylate-3-sulfopropyl methacrylate, potassium salt) (P(St-MMA-SPMAP)) emulsion. This method is widely used because it is simple and can rapidly prepare large photonic crystal films. The pore size of the IO structure was regulated by changing the diameter of the polymer. The IO structure was characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), ultraviolet-visible absorption spectroscopy (UV-Vis), and reflectance spectroscopy. The photocatalysis performance of three samples was evaluated via photocatalytic water splitting under visible light irradiation ( λ ≥ 420 nm). The photocatalytic hydrogen production rate of the CdS IO film fabricated using a 310 nm P(St-MMA-SPMAP) template (CdS-310) was twice that of CdS nanoparticles (CdS-NPs) under visible light irradiation. This photocatalytic performance enhancement was ascribed to the hierarchically porous structure of the IO photonic crystal. On the one hand, the IO structure increased the propagation of photons in the photocatalytic material and improved sunlight utilization. On the other hand, the structure is conductive to transport and adsorption of molecules. In addition, the IO structure was composed of nanoparticles, providing more active sites for the photocatalytic reaction.