Donor–Acceptor–Donor‐Functionalized Pillared Graphene Oxide for High‐Performance Flexible Supercapacitor Device

In this investigation, donor–acceptor–donor (D‐A‐D) based small organic molecule 2,5‐bis((4‐aminophenyl) amino) cyclohexa‐2,5‐diene‐1,4‐dione (2NH 2 ‐Ph‐BQ) as the pillar in between graphene oxide (GO) sheets to fabricate the GO‐BAPh‐BQ‐BAPh‐GO electrode materials with graphite foil (GF) substrate is utilized. At first, three‐electrode supercapacitor (SC), two‐electrode symmetric supercapacitor (SSC) device, and flexible symmetric supercapacitor device using GO‐BAPh‐BQ‐BAPh‐GO/GF electrode are assembled, which show excellent electrochemical performance with respective specific capacitance ( C sp ), energy density (ED), power density (PD), and cycling stability. The three‐electrode cell galvanostatic charging–discharging (GCD) exhibits good C sp of 338.07 F g −1 at 0.5 A g −1 current density, and cyclic voltammogram exhibits C sp of 244.31 F g −1 at 5 mV s −1 . The SSC device GCD exhibits good C sp of 147.67 F g −1 at 0.5 A g −1 current density, ED 36.18 Wh kg −1 , and PD 1259.98 W kg −1 . Cycling stability shows 99.03% retention after 10 000 GCD cycles and coulombic efficiency 99.21%. The performance of the pillared in SSC suggests the great potential of the electrode material or developing both high energy and power densities in electrical energy storage devices.