Redox active covalent organic framework-based conductive nanofibers for flexible energy storage device

Covalent organic frameworks (COFs) constitute a family of crystalline porous polymers that are being studied for electrochemical energy storage. However, their low electrical conductivity and poor processability have largely limited performances practical applications. Here, we develop an interfacial synthesis method to grow few-layered 2D redox-active COFs (DAAQ-TFP COF) on the surface carboxylated carbon nanotubes (c-CNTs) in order fabricate core-shell c-CNT@COF nanofibers, which thickness morphology COF nanolayers can be finely controlled. When using c-CNT@COFs as electrode material, tailored nanostructure with high allows efficient electron transfer, while structure promotes fast electrolyte ion diffusion near-surface region, results utilization redox active sites COF. More significantly, nanofibrous show good assembled into freestanding flexible nanopapers assistance Cladophora cellulose. Given performance excellent flexibility, nanopaper electrodes hybrid capacitors, showing areal capacitance extremely long lifetime. This study provides new pathway development next generation sustainable storage devices based cellulose materials. • Redox-active controlled were fabricated CNT. The obtained nanofibers showed processability. Interweaving CNTs formed nanopapers. foldable capacitors.