New Carbazole-Based\nPolymer with a D–A System\nas a Highly Stable Organic Electrode Material for an Asymmetric Supercapacitor

Over the past few decades, conductive polymers have captured\nsignificant\nfocus due to their distinct conducting properties and enhanced application\nin energy storage devices. In this regard, a novel strategy of donor–acceptor\ntype polymer have been synthesized via the direct arylation polymerization\nmethod using palladium acetate as a catalyst. The conducting polymer\n(named SP) exhibited a good thermal stability of 286.5 °C and\npossessed a lower band gap of 2.3 eV which was determined from the\noptical and electrochemical techniques. The SP polymer exhibits a\nthree-electrode specific capacitance of 611.2 F g<sup>–1</sup> in 1 M KOH at a current density of 1 A g<sup>–1</sup>. Further,\nthe synthesized polymer was applied as a positive electrode material,\nand activated carbon was used as a negative electrode material in\nthe asymmetric system. At 2 A g<sup>–1</sup> current density,\nthe specific capacitance of the supercapacitor device was determined\nto be 140.13 F g<sup>–1</sup>. It was observed that an excellent\nenergy density of 52.69 W h kg<sup>–1</sup> at 2334 W kg<sup>–1</sup> power density exhibited good cyclic stability up\nto 10,500 cycles with a retained initial capacity of 92.6%.