Transfunctionalization of graphite fluoride engineered polyaniline grafting to graphene for High–Performance flexible supercapacitors.

[Display omitted] Low energy density is the major obstacle for the practical all-solid-state supercapacitors, which may be raised by the combination of the pseudocapacitance with the electrochemical double-layer capacitance. Although graphene and polyaniline have been demonstrated two effective materials, the synthetic route of graphene and their hybrid mode largely dictated the capacitive performances and cyclability of graphene/polyaniline nanocomposites. Herein , we employed commercial graphite fluoride as the precursor to obtain graphene with a well-preserved carbon lattice. After graphite fluoride functionalization by p -phenylenediamine (p PDA) and in situ oxidative polymerization of anilines, polyaniline (PANI) chains were covalently attached to graphene framework through p PDA bridges. Multiple characterizations were performed to confirm the covalent binding mode between graphene scaffolds and PANI partners, and electrochemical tests unraveled the as-prepared G– p PDA–PANI triads delivered a gravimetric capacitance as high as 638F g−1 and a further amplified volumetric capacitance (up to 759F cm−3). The bendable all-solid-state supercapacitors yielded an encouraging energy density of over 18 W h L−1 at a power density high to 5,950 W L−1, while exhibiting an exceptional rate capability, cycling stability and mechanical flexibility. [ABSTRACT FROM AUTHOR]