Synthesis and electrochemical capacitor characterization of new copolyimides containing thiazole ring and their composites with conductive polymer

In this research work, copolyimides (PI a,b ) were synthesized by chemical routs. We used perylene-3,4,9,10-tetracarboxylic dianhydride and synthesized diamines (DA a,b ) containing thiazole ring as monomers to obtain PI a,b which were characterized by 1 HNMR and FTIR spectroscopies. We prepared POAP/PI a and POAP/PI b by depositing poly ortho amino phenol (POAP) as conductive polymer on the surface of PI a,b via in situ electropolymerization. To evaluate the effect of the PI a,b in terms of the electrochemical performance of composites, we used galvanostatic charge/discharge, cyclic voltammetry, and electrochemical impedance spectroscopy. The specific capacitance of 207.2 and 322.4 F/g are obtained for POAP/PI a and POAP/PI b , respectively. All these evidences prove that POAP/PI composites have long cycle life as well as high specific capacitance, which are indicative for being a good candidate in terms of application in supercapacitors. Graphic abstract