Graphene oxide coated polyaminoanthraquinone@MXene based flexible film electrode for high-performance supercapacitor

The diversified development of electronic products stimulates the great demand for flexible energy storage de-vices with high energy density. Poly (1,5-diaminoanthraquinone) (PDAAQ) is considered as a highly promising electrode material due to its unique pi-conjugated structure and high theoretical capacitance. Herein, we first prepare cetyltrimethylammonium bromide (CTAB) modified graphite oxide (GO) coated poly (1,5-diaminoan-thraquinone) (PDAAQ) nanotubes@Ti3C2TX flexible film (CGO/PDAAQ@MXene) by electrostatic self-assembly. After modification with cationic surfactant, CTAB modified GO coated PDAAQ nanotubes (CGO/PDAAQ) ex-hibits overall positive charge, and then polymer nanotubes are uniformly inserted into negatively charged layered MXene to effectively avoid self-stacking of MXene layers. Under the synergistic effect, the ordered 1D nanotubes structure of CGO/PDAAQ and excellent intrinsic conductivity of MXene can greatly enhance the electron transfer and ion migration rates for electrode. The flexible self-supporting CGO/PDAAQ@MXene has good mechanical properties and can be completely recovered after 500 bending tests. Electrochemical tests of the flexible electrode exhibit the specific capacitance of 346 F g at 1 A g-1 (865 mF cm-2 at 2.5 mA cm-2), good rate performance and excellent cyclic stability. The as-fabricated flexible asymmetric supercapacitor exhibits high energy density of 41 Wh kg-1 at 404 W kg-1, which can successfully light 35 small LED bulbs.

Automated summary

In this study, a surface-modified poly (1,5-diaminoanthraquinone) nanotubes@MXene flexible film was prepared via electrostatic self-assembly. The film exhibited good mechanical properties, excellent conductivity, and superior electrochemical performance, making it suitable for high-energy density flexible energy storage devices.