Constructing porous organic polymer with hydroxyquinoline as electrochemical-active unit for high-performance supercapacitor.

Abstract As one type of electrode materials for supercapacitor, porous organic polymer usually suffers from poor rate performance and inferior cycling stability because of the low electrochemical stability. Herein, a porous organic polymer with hydroxyquinoline as electrochemical-active unit is synthesized by one-step polymerization reaction between perylene, 8-hydroxyquinoline and chloroform. The obtained porous polymer owns large surface area (221.4 m2 g−1), porous structure, abundant redox active sites (hydroxyquinoline) and exhibits a superior supercapacitive performance with a high specific capacitance of 522.0 F g−1 (at 1.0 A g−1) and an unprecedented rate capability (65.5% capacitance retention from 1 to 10 A g−1) in a three-electrode configuration. The assembled symmetric supercapacitor based on the designed porous polymer demonstrates a high energy density of 29.8 Wh kg−1 at a power density of 0.16 kW kg−1 in the voltage range 0–1.6 V and good cycling stability of 71.2% capacity retained after 10000 cycles, makes the derived porous polymer a promising electrode material for the high-performance energy storage device. Graphical abstract Image 1 Highlights • PyrOxin-POP with hierarchical porous structure was firstly fabricated. • Hydroxyquinoline as electrochemical-active unit generates pseudocapacitance. • PyrOxin-POP exhibits large capacity of 552 F g−1 and good rate capability of 65.5%. • PyrOxin-POP achieves an unprecedented cycling stability of 71.2% after 10000 cycles. • The symmetric supercapacitor device shows a high energy density of 29.8 Wh kg−1. [ABSTRACT FROM AUTHOR]