Abstract: π-Conjugated polymers constructed from active small molecules exhibit extended conjugated structures, overcoming the solubility and conductivity challenges of small molecules. Along with their high theoretical capacities, such materials have attracted increasing attention as cathodes for rechargeable aqueous zinc batteries (RAZBs). Herein, we designed and synthesized an active-site-rich π-conjugated polymer, poly(5,8-diaza-1,4-naphthoquinone) (PANQ), as a high-performance RAZBs cathode material. The PANQ cathode delivers high discharge capacities, rate capability and cycling stability, achieving a reversible capacity of 443.4 mAh/g at 0.2 A/g, corresponding to 90.5% of its theoretical capacity, and retaining 65% of its capacity after 1000 discharge-charge cycles. This work demonstrates a promising π-conjugated polymer with efficient energy-storage capability, offering a potential cathode candidate for developing high-performance RAZBs and other energy-storage systems.

Key words: π-Conjugated polymers, Aqueous zinc batteries, Organic cathodes, Energy storage mechanism, High-capacity