Hierarchical polyimide-derived nitrogen self-doped carbon nanoflowers for large operating voltage aqueous supercapacitor

摘要: Abstract Herein, novel polyimide (PI) nanoflowers with intertwined nanosheets is synthesized by one-step hydrothermal "bottom-up" self-assembly crystal growing process using low-cost aromatic diamine and dianhydride as monomers. Then, hierarchical polyimide-based porous carbon (PI-CNFs) are prepared synchronous activation catalytic carbonization approach utilizing precursor FeCl3 activating agent catalyst. Owing to its unique interlaced nanosheet structure, high specific surface area nitrogen doping content, the PI-CNFs possesses capacitance, capacity rate performance overlength cycle life. In addition, a symmetrical aqueous supercapacitor assembled has large operating voltage of 2.0 V, energy 18.3 Wh kg−1 at power 500 W kg−1, well excellent cycling stability. Therefore, this work will propose an affordable strategy for designing polymer nanosheets, open up possibility easy preparation, environmentally friendly synthetic polymers-based meet storage demands.