Development of the new polyoxometalate modifed 1102 photomtalyst and the multi-excitation effect

我们用双色双激光闪光光解技术成功地研究了POM介导的TiO2光催化反应中几种化合物的单电子氧化和还原过程。他应该指出，这两个进程都是使用相同的系统进行审查的。对于单电子氧化过程，由于电子从二氧化钛的CB转移到聚甲醛上，单电子氧化的效率大大提高。对于单电子还原过程，我们观察到来自PW_12O_40^4*的电子注入。利用双色双激光照射，实现了对TiO2/PW12O40^3-/MV^2+三元体系中电子的存储。本研究结果将为二氧化钛/聚甲醛光催化剂的进一步应用奠定基础，并证明双色双激光闪光光解技术是研究纳米复合材料非均相表面界面电子转移的有力工具。

We have successfully investigated the one-electron oxidation and reduction processes of several compounds during POM-mediated TiO_2 photocatalytic reactions using a two-color two-laser flash-photolysis technique. It should he noted that both processes were examined using the same system. For the one-electron oxidation prosses, the efficiency of the one-electron oxidation is significantly enhanced due to electron transfer from the CB of TiO_2 to POM. For the one-electron reduction processes, we observed electron injection from PW_12O_40^4*. to the CB of TiO_2, and achieved storage of the electrons in the TiO_2/PW_12O_40^3-/MV^2+ ternary system using a two-color two-laser irradiation. The present results will lead to further application of TiO_2/POM photocatalysts and demonstrate that the two-color two-laser flash-photolysis technique is a powerflul tool for the investigation of interfacial electron transfer at the heterogeneous surfaces of nanocomposite materials.