Chemical and electronic modifications and kinetic investigations on photocatalysts with defect-pyrochlore-structe for water splitting

到目前为止，将继续对Emmy-Noether项目中制备的所有材料进行彻底的动力学研究，以确定所产生的光催化剂的反应动力学，并实现材料、形态、结晶度和活性之间的关联。在Emmy-Noether项目前期研究成果的基础上，还将进一步制备具有可剪裁介孔和缺陷焦绿石结构的孔壁的优化介孔光催化剂，该催化剂的产氢活性将大大超过本项目先前制备的介孔和纳米颗粒缺陷焦绿石。这一研究想法不是最初提交的项目的一部分，而是在艾美奖-诺伊特项目中获得的知识的基础上进行的合乎逻辑的发展。因此，本论文将采用水热合成法制备纳米CsTaWO6，并将其作为纳米颗粒构建块用于模板法合成介孔CsTaWO6。通过选择所需的纳米颗粒尺寸，可以设置光催化析氢的最佳壁厚。这在以前关于CsTaWO6的软模板和硬模板的工作中是不可能的。通过合适的模板，还应定制孔洞几何形状。

A thorough kinetic study on all materials prepared in the Emmy-Noether project so far will be continued, to identify the reaction kinetics of the resulting photocatalysts, and to achieve a correlation between material, morphology, crystallinity, and activity. Based on the previous results of the Emmy-Noether-project, additionally an optimized mesoporous photocatalyst with tailored mesopores and pore walls with defect-pyrochlore structure shall be prepared, which shall exceed the activity in hydrogen production of the previously in this project prepared mesoporous and nanoparticulate defect-pyrochlores significantly. This research idea was not part of the initially submitted project, and presents a logical development based on the knowledge gained in the Emmy-Noether project. Therefore, nanoparticles of CsTaWO6 will be prepared by hydrothermal synthesis, and subsequently used as nanoparticulate building blocks in a template-based synthesis to prepare mesoporous CsTaWO6. By choosing the desired nanoparticle size, the optimum wall thickness for photocatalytic hydrogen evolution can be set. This was not possible in previous work on soft- and hard-templating of CsTaWO6. By means of suitable templates, the pore geometry shall also be tailored.