基于金属磷化物的光催化全分解水体系构建及机理研究

过渡金属磷化物是磷原子进入过渡金属的晶格中形成的一类间充化合物，一些过渡金属磷化物具有类金属性质、价格低廉、稳定性高。近年来，研究发现金属磷化物不仅具有高效的电催化析氢活性，同时也能作为助催化剂用于光催化分解水产氢。在本项目中，我们将在前期研究工作的基础上，建立基于金属磷化物的高效光催化全分解水体系。为此，我们将设计合成一系列不同结构和形貌的金属磷化物（双组份金属磷化物、三组分金属磷化物）用于光催化太阳能转换，利用超快光谱技术研究不同光催化剂与金属磷化物之间电子传递过程，理解其光催化产氢的机理和本质，提高光催化分解水产氢活性；利用磷掺杂硫化镉作为光催化剂，金属磷化物作为助催化剂，在纯水中建立光催化全分解水体系，揭示金属磷化物/磷掺杂硫化镉复合物体系全分解水的机理。

Transition metal phosphides (MP) are composed of metal and phosphorus elements where P atoms are isolated into the metal lattice. Some of transition metal phosphides exhibit a metallic character, which can act as highly active catalysts for both electro- and photocatalytic hydrogen generation reactions. This project aims to construct highly efficient photocatalytic overall water splitting systems by using metal phosphides as cocatalyst. In detail, we propose [1] to design and prepare binary metal phosphides and trinary metal phosphides with various shapes and components for photocatalytic solar energy conversion, [2] to investigate the electron transfer between different semiconductors and metal phosphides by taking using of ultrafast spectroscopic technique, [3] to elucidate the nature of metal phosphides in photocatalytic hydrogen evolution reaction and to further improve the catalytic activity, [4] to construct photocatalytic overall water splitting systems with P-doped CdS and metal phosphides as photocatalyst and cocatalyst, respectively, and finally [5] to uncover the mechanism of MP/P-doped CdS composites for photocatalytic overall water splitting.