基于过渡金属硫氧化物半导体材料的太阳能光催化分解水制氢研究

光催化及光电催化分解水制氢是一种有效的将太阳能转化为洁净氢能的途径。硫氧化物半导体材料具有吸收光谱宽以及能带电位合适等特点，成为广泛研究的一类光催化剂，我国是世界第二大产硫国，然而国内对硫氧化物类光催化剂材料的研究却非常少。项目申请人在过去的五年里一直致力于Sm2Ti2S2O5和La5Ti2CuS5O7等硫氧化物半导体材料的光催化及光电催化分解水反应研究。本项目将根据以往研究成果，开发具有可见光响应的过渡金属硫氧化物半导体材料，应用于太阳能光催化及光电催化全反应分解水制备氢气及氧气，内容主要包括现有催化剂优化，新型催化剂材料开发，新型反应体系开发，以及催化反应机理描述。在项目结束时，力争实现光催化产氢及产氧半反应在可见光（420 nm）下的量子效率达到10%以上，太阳光分解纯水反应的能量转化效率（STH）达到0.3%，发表一定数量的高水平文章，增强我国在硫氧化物光催化剂研究方面的实力。

Photocatalytic and photoelectrochemical water splitting are ideal and effective ways to convert solar energy into H2 energy. Oxysulfide semiconductor photocatalyst materials have attracted much attentions due to their wide-wavelength light absorption and proper band potentials. However, there are very limited publications reported from China. The project applicant has long-term experience with photocatalytic reactions. During the last 5 years, I worked on Sm2Ti2S2O5 and La5Ti2CuS5O7 oxysulfide materials applied to photocatalytic and photoelectrochemical water splitting, and published several peer reviewed papers. With the support the project and based on previous results, our group will carry out the research on developing visible-light-responsive transition metal oxysulfide semiconductor materials applied to photocatalytic and photoelectrochemical water splitting reactions. The research plan includes: 1) optimization of the reported prospective photocatalst materials, 2) development of new materials, 3) designing of new reaction systems, and 4) clarification of the reaction mechanism. After four years, the target is to produce an apparent quantum efficiency over 10% at 420 nm and accomplish an overall water splitting reaction owing solar to hydrogen efficiency of 0.3% with publishing several papers.