P3HT纳米纤维的制备及其光催化制氢性能

Preparation and photocatalytic hydrogen production performance of P3HT nanofibers

为研究纤维膜光催化剂的产氢效果,以共轭聚合物半导体聚(3-己基噻吩)(poly(3-hexylthiophene),P3HT)和聚甲基丙烯酸甲酯(polymethyl methacrylate,PMMA)的共混溶液为纺丝溶液,采用静电纺丝法制备系列P3HT/PMMA纳米纤维,并对其光催化分解水制氢性能进行测试分析。利用扫描电镜(SEM)、X-射线衍射仪(XRD)、接触角测试仪等对不同的P3HT/PMMA纳米纤维的表观形貌及相关性质进行表征。SEM图显示,当纺丝液分别以氯仿/氯苯和氯苯为溶剂时,纳米纤维形貌表现出明显差异;紫外-可见吸收光谱显示纳米纤维中P3HT为光催化活性成分,其中以氯苯为溶剂、空气湿度80%时制得的纳米纤维产氢速率最佳(145μmol/(h·g));XRD、接触角和电流测试与分析表明,P3HT以非晶结构均匀分散在纳米纤维中,且纳米纤维膜疏水程度越低,制氢速率越高。P3HT纤维化可有效提高其光催化制氢性能,不仅为光解水制氢提供了新思路,还为可溶液加工的线性共轭聚合物半导体提供了新的应用领域。

The photocatalytic decomposition of water to hydrogen was tested and analyzed in order to study the hydrogen-producing effect of fiber membrane photocatalysts.Using the blending solution of conjugated polymer semiconductor poly(3-hexylthiophene)(P3HT)and polymethyl methacrylate(PMMA)as the spinning solution,a series of P3HT/PMMA nanofibers were prepared by electrospinning method.The apparent morphology and related properties of different P3HT/PMMA nanofibers were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),contact angle tests and so on.The fiber morphology showed obvious differences when the spinning liquid was taken chloroform/chlorobenzene and chlorobenzene as solvents,respectively.The SEM results show that there are significant differences in the fiber morphology when the spinning solution using chloroform/chlorobenzene and chlorobenzene as solvents,respectively.The UV-Vis absorption spectroscopy indicated that P3HT is the photocatalytic active component in the nanofibers.The nanofibers possessed the maximum hydrogen production rate(145μmol/(h·g))when prepared with chlorobenzene as solvent and at the air humidity of 80%.XRD,contact angle,and photocurrent testing and analysis suggest that P3HT is uniformly dispersed in the nanofibers with an amorphous structure.This study shows that fibrosis of P3HT is an effective strategy for improving its photocatalytic hydrogen production performance,which provides a new idea for photolysis of water to hydrogen,and also offers a new application area for linear conjugated polymer semiconductors that can be processed in solution.