供电子基取代联苯胺类共轭聚合物的光电性质及电化学性能

通过取代基修饰增强联苯胺单元供电子性,使其与缺电子的苯甲醛单元共聚,基于简单结构设计合成了一组具有给体-受体型结构的聚联苯胺基共轭聚合物聚物。采用H NMR、FT-IR,XRD对单体及聚合物进行了结构表征,表明各目标产物成功制得。通过Uv-vis、Uv-vis-DRS、循环伏安、计时电位、交流阻抗以及循环性能测试对各共聚物进行了光电性质及电化学性能测试。结果表明,引入甲氧基后制得的共轭聚合物P3分子链共轭程度较高,结晶性较佳,光学带隙E_g^opt为2.09 eV,该样品具有较高的HOMO及较低的LUMO值,分别为-5.15 eV和-3.06 eV,呈现更好的氧化还原性,相应地也表现出较佳的电化学电容特性。0.3 A/g时,P3恒流充放电首次放电比电容达1030 F/g,经700次循环仍保持在530 F/g。

Photoelectric and electrochemical performances of electron donor substituted benzidine based conjugated polymers

The electron donating properties of benzidine units were enhanced by substituent modification, then by copolymerizing then with benzaldehyde units a group of conjugated polymers with donor acceptor structure were synthesized based on the simple structure design. The structures of the monomers and polymers were characterized by H NMR, FT-IR and XRD, which showed that the target products were successfully prepared. The photoelectric and electrochemical properties of the copolymers were tested by UV-vis, UV-vis-DRS, cyclic voltammetry, chronopotentiometry, AC impedance and cyclic performance tests. The results show that the conjugated polymer P3 prepared by introducing methoxyl group has higher conjugation degree and better crystallinity, and its optical band gap E_g^opt is 2.09 eV. This sample has higher HOMO and lower LUMO values, which are -5.15 eV and -3.06 eV respectively, showing better redox performance, and correspondingly also showing better electrochemical capacitance characteristics. At 0.3 A/g, the first discharge specific capacitance of P3 tested by constant current charge and discharge reaches 1030 F/g, and remains at 530 F/g after 700 cycles.