A Six‐Electron‐Transfer Organic Cathode for Aqueous Zinc Batteries

Abstract Organic materials have attracted considerable attention as high‐performance cathodes for aqueous zinc‐ion batteries (AZIBs) owing to their structural tunability and molecular diversity. However, their capacities are typically limited (≤350 mAh g −1 ), primarily due to redox reactions involving the transfer of only a few electrons (≤4 electrons) per molecule. Here, the study designs and synthesizes a six‐electron‐transfer organic cathode material, 5,12‐dihydro‐1,5,7,8,12,14‐hexaazapentacene (DHHAP), by bridging water‐soluble pyridinediamine and hydroxybenzoquinone units. First‐principles calculations and in situ ATR‐FTIR spectroscopy confirm that four imine (C═N) groups and two amine (─NH─) groups serve as redox‐active sites, affording a high theoretical capacity of 562 mAh g −1 . Electrochemical tests reveal that DHHAP delivers a remarkable discharge capacity of 507 mAh g −1 at 50 mA g −1 —approaching the theoretical limit—and exhibits excellent cycling stability over 10 000 cycles at 10 A g −1 . Moreover, it maintains outstanding rate capability and long‐term cycling performance even at high mass loadings (3–10 mg cm −2 ), underscoring its promise for practical applications in aqueous zinc‐ion batteries.