Dithiophenedione-Based Covalent Organic Frameworks for Supercapacitive Energy Storage
Shuang Li, Bidhan Kumbhakar, Bikash Mishra, Jérôme Roeser, Nicolas Chaoui, Johannes Schmidt, Arne Thomas, Pradip Pachfule
Abstract
Covalent organic frameworks (COFs) are organic materials with well-defined atomic arrangements, significant porosity, and tailorable chemical properties, which make them interesting for a variety of applications. In this study, we explore the synthesis of a crystalline COF based on dithiophenedione moieties in its backbone (TTT-DHTD), which has been further employed as an electrode material for supercapacitors. By comparison with a dimethoxybenzene-dithiophene-based COF (TTT-DMTD), it is shown that redox-active dithiophenedione moieties have a profound effect on the capacitance enhancement. Due to the synergistic impact of its high porosity, well-defined crystalline structure, and the presence of redox-active components, the TTT-DHTD COF exhibits both high 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 ).