Dithiophenedione-Based\nCovalent Organic Frameworks\nfor Supercapacitive Energy Storage

Abstract

Covalent organic frameworks (COFs) are organic materials\nwith well-defined\natomic arrangements, significant porosity, and tailorable chemical\nproperties, which make them interesting for a variety of applications.\nIn this study, we explore the synthesis of a crystalline COF based\non dithiophenedione moieties in its backbone (TTT-DHTD), which has\nbeen further employed as an electrode material for supercapacitors.\nBy comparison with a dimethoxybenzene-dithiophene-based COF (TTT-DMTD),\nit is shown that redox-active dithiophenedione moieties have a profound\neffect on the capacitance enhancement. Due to the synergistic impact\nof its high porosity, well-defined crystalline structure, and the\npresence of redox-active components, the TTT-DHTD COF exhibits both\nhigh energy storage density and long-term durability (273.3 F g^–1 at 0.5 A g^–1 and 163.7 F g^–1 at 10 mV s^–1).