Viologen‐Benzothiadiazole‐Based Porous Organic Polymers for High‐Performance Photoelectrochemical Supercapacitors

ABSTRACT Porous organic polymers (POPs) containing donor‐acceptor (D‐A) moieties have recently emerged as promising electrode materials for supercapacitors due to their tunable electronic structures, controlled charge transfer capabilities, and high redox activities. In this study, a light‐absorbing D‐A type POP was prepared using the solvothermal method by combining a benzothiadiazole‐carbazole‐based donor‐acceptor core with viologen‐based peripheral groups. The photoelectrochemical H‐type cell was constructed with a viologen‐based POP photoanode and a reduced graphene oxide (rGO) cathode electrode. The specific capacitance of the supercapacitor increased from 274.8 to 383.4 F/g at 1 A/g under illumination due to the decrease in charge transfer resistance of the electrode upon exposure to light. The constructed photoelectrochemical supercapacitor retained 88% of its capacitance after 10 000 cycles under irradiation and showed an energy density of approximately 80 Wh/kg under the same conditions. These results demonstrate the potential of photo responsive D‐A POPs as efficient materials for multifunctional supercapacitors.