2D Conductive Metal-Organic Framework with Anthraquinone Built-In Active Sites as Cathode for Aqueous Zinc Ion Battery

2D conductive metal-organic frameworks (2D c-MOFs) as emerging 2D graphene-like crystalline materials have become a promising platform for energy storage. However, their capacity is largely constrained by the limited number of electroactive sites. Integrating multiple redox-active moieties into the 2D c-MOF skeletons is an efficient strategy toward high-performance battery cathodes. Herein, by tailoring an anthraquinone-based multitopic catechol ligand, a novel quinone-containing copper-catecholate MOF (Cu-TBPQ MOF) is successfully developed. The Cu-TBPQ MOF exhibits abundant porosity, excellent conductivity, and multiple redox-active sites. These characteristics make it an ideal candidate as a cathode material for zinc ion batteries. Notably, the Cu-TBPQ MOF demonstrates an impressive reversible specific capacity of 371.2 mAh g-1 at a current density of 50 mA g-1. Furthermore, it exhibits outstanding rate capability and long-term durability, retaining a capacity of 120.3 mAh g-1 at a high current density of 2.0 A g-1 even after 500 charge-discharge cycles. The successful enrichment of redox-active sites in the work opens up new avenues for the rational design of electrochemically active 2D c-MOFs, enhancing their potential for advanced energy storage applications. By customizing an anthraquinone-based multitopic catechol ligand, a novel conductive Cu-TBPQ MOF is synthesized. The incorporation of quinone moieties into 2D conductive metal-organic frameworks (2D c-MOFs) remarkably boosts the density of redox-active sites. Therefore, the Cu-TBPQ MOF is an ideal cathode material for zinc ion batteries, featuring remarkable reversible specific capacities, superior rate capabilities, and long-term durability. image