SrTiO3基可见光完全分解水上转换光催化剂的多元稀土掺杂及其协同机制研究

项目名称： SrTiO3基可见光完全分解水上转换光催化剂的多元稀土掺杂及其协同机制研究

项目编号： No.51302212

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 师进文

作者单位： 西安交通大学

项目金额： 25万元

中文摘要： 可见光完全分解水光催化剂的开发是太阳能光催化制氢研究的重点和难点。项目申请人在前期工作中开发了Er3+掺杂SrTiO3上转换光催化剂，首次用于可见光制氢和制氧，证实了其可见光完全分解水的潜力。本项目针对Er3+掺杂SrTiO3光催化过程的关键制约因素，拟对其进一步改性。首先，基于不同稀土的物理化学本质，分别开发上转换剂（Ho3+）与上转换剂（Er3+）共掺杂的SrTiO3、敏化剂（Yb3+）与激活剂（Er3+）共掺杂的SrTiO3以及电荷平衡剂（La3+）与上转换剂（Er3+）共掺杂的SrTiO3，阐明双稀土掺杂剂间的三类协同机制，揭示其对光吸收、光生激发态产生、光生载流子复合的内在影响。进而，基于以上协同机制，开发多元稀土掺杂的SrTiO3，期望通过多元稀土协同掺杂优化光催化过程，最终实现高效可见光催化完全分解水。本研究将为可见光完全分解水上转换光催化剂的开发提供指导原则。

中文关键词： 分解水；制氢；制氧；光催化；可见光

英文摘要： Development of photocatalysts for visible-light-driven overall water splitting was acknowledged as the key and difficult point for photocatalytic hydrogen production under solar light irradiation. In the previous work of the applicant of this project, upconversion-based Er3+ doped SrTiO3 photocatalyst was developed, and applied to visible-light-driven hydrogen and oxygen production for the first time, thus proving the potential of this photocatalyst for visible-light-driven overall water splitting. This project focused on the further modification of this photocatalyst aiming at the key restraining factors during the photocatalytic process. First, based on the physiochemical characteristics of different rare earths, upconversion agent (Ho3+) and upconversion agent (Er3+) codoped SrTiO3, sensitizer (Yb3+) and activator (Er3+) codoped SrTiO3, and charge-balance agent (La3+) and upconversion agent (Er3+) codoped SrTiO3 will be developed and comprehensively investigated, in order to clarify the synergistic effects between the three groups of codopants and further to reveal the intrinsic influences of the synergistic effects on absorption of light, generation of photogenerated excited states, and recombination of photogenerated charge carriers. Furthermore, based on the synergistic effects clarified above, multicompon

英文关键词： water splitting；hydroden evolution；oxygen evolution；photocatalysis；visible light