Hu Sujuan, Zhu Mingshan
Department of Chemistry, Kunming University, Kunming, 650214, P. R. China.
School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, P. R. China.
Chempluschem. 2016 Nov;81(11):1202-1208. doi: 10.1002/cplu.201600351. Epub 2016 Aug 23.
A heterojunction of a perovskite-type La Ti O (LTO)/CdS quantum dot (QD) nanocomposite was prepared by the chemical bath deposition method. The solar-light-driven H generation results show that this CdS QDs/LTO heterojunction exhibits great improvement in the photocatalytic H production and its photoelectrochemical properties in comparison with pure CdS QDs and LTO nanosheets. A possible enhanced mechanism of photoinduced interfacial charge transfer between CdS and LTO is proposed for the heterojunction. The shift of the CdS conduction band (CB) edge can enlarge the CB potential difference between CdS QDs and LTO, enhancing transferred driven force of the interfacial electrons and finally improving the two components' separation activity of photogenerated carriers. This study provides a promising method for constructing an efficient photoinduced interfacial charge transfer over LTO and CdS QD heterojunctions for photocatalytic hydrogen production.
采用化学浴沉积法制备了钙钛矿型LaTi O（LTO）/CdS量子点（QD）纳米复合材料的异质结。太阳光驱动的产氢结果表明，与纯CdS量子点和LTO纳米片相比，这种CdS量子点/LTO异质结在光催化产氢及其光电化学性能方面有了很大的改善。针对该异质结，提出了一种CdS与LTO之间光致界面电荷转移的可能增强机制。CdS导带（CB）边缘的移动可以扩大CdS量子点与LTO之间的CB电位差，增强界面电子的转移驱动力，最终提高光生载流子在两种组分中的分离活性。该研究为构建高效的LTO和CdS量子点异质结光致界面电荷转移用于光催化产氢提供了一种有前景的方法。
