基于芴的有机共轭聚合物光催化水制氢性能研究

Performance Study on Fluorene-based Conjugated Polymers as Photocatalysts for Hydrogen Evolution

设计合成甲基取代芴为主体的两种有机共轭半导体材料QX-FL和SE-FL,并将其应用于光催化水制氢领域,研究两种不同窄带系修饰的聚合物对光催化性能的影响。制备的聚合物QX-FL和SE-FL都有较宽的光吸收范围,合适的光学带隙,两种聚合物都具有光催化水制氢的能力。研究发现相对于喹喔啉单元来说,苯并硒二唑单元具有更优良的修饰效果,SE-FL的带隙低于QX-FL,聚合物的光催化性能有了显著性的提高,QX-FL的光催化性能为0.4μmol·h-1,SE-FL的光催化性能为3.5μmol·h-1。

Two kinds of organic conjugated semiconductor materials, Q X -FL and SE- F L , were mainly synthesized and their application in the field of photocatalytic water hydrogen production was studied for the first time. The influence of two different narrow band modified polymers on photocatalytic properties was investigated. The prepared polymers S e -FL and QX-FL had wide optical absorption range and suitable optical band g a p, and both of the two polymers had the ability to produce hydrogen by photocatalytic water. The study found that compared with quinoxaline u n i ts, selenole unit had better modification effe ct ,the band gap of SE -FL was less than Q X-FL and the photocatalytic properties of the polymer were remarkably improved. The photocatalytic activity of Q X -FL was 0. 4 滋 mol ？ h -1 ,and the photocatalytic activity of SE-FL was 3. 5 滋 mol ？ h -1.