Shell Thickness Engineering Significantly Boosts the Photocatalytic H-2 Evolution Efficiency of CdS/CdSe Core/Shell Quantum Dots
Shell Thickness Engineering Significantly Boosts the Photocatalytic H-2 Evolution Efficiency of CdS/CdSe Core/Shell Quantum Dots
复制标题
壳厚度工程显着提高 CdS/CdSe 核/壳量子点的光催化 H-2 析出效率
DOI：
10.1021/acsami.7b07211
复制
发表时间：
2017
影响因子：
9.5
通讯作者：
Jin Yongdong
中科院分区：
文献类型：
--
作者：
Wang Ping;Wang Minmin;Zhang Jie;Li Chuanping;Xu Xiaolong;Jin Yongdong
胶体半导体量子点（QD）最近成为一个很好的候选人在水中的光催化析氢（H2）。进一步了解影响和提高量子点制氢系统催化活性的因素，对于将来设计此类系统用于实际应用具有重要意义。在这里，我们报告了胶体CdS/CdSe核/壳量子点的精细壳层厚度工程及其对水中光催化产氢的影响。结果表明，在适当的壳层厚度下，CdS/CdSe核/壳量子点在420 nm光照射下的光生氢量子产率（ΦH2）可达30.9%，比CdS核量子点提高了49%。此外，还初步提出和讨论了其内在机理。
Colloidal semiconductor quantum dots (QDs) have recently emerged as a good candidate for photocatalytic hydrogen (H2) evolution in water. A further understanding of the factors that can affect and boost the catalytic activity of the QD-based H2-generating system is of great importance for the future design of such systems for practical use. Here, we report on the fine shell thickness engineering of colloidal CdS/CdSe core/shell QDs and its effect on the photocatalytic H2production in water. Our results show that, with the proper shell thickness, the H2photogeneration quantum yield (ΦH2) of CdS/CdSe core/shell QDs could reach 30.9% under the illumination of 420 nm light, which is 49% larger than that of the CdS core. Furthermore, the underlying mechanism has also been tentatively proposed and discussed.