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