A new ternary composite of manganese dioxide (MnO 2 ), polyaniline (PANI) and graphene nanoribbons (GNRs) has been fabricated through a two-step polymerization process. With manganese dioxide nanorods and graphene nanoribbons embedded in the PANI matrix, the MnO 2 /GNRs/PANI ternary composites with 3-dimensional porous structures exhibited higher specific capacitance and better charge-discharge cycling performance than that of MnO 2 and MnO 2 /GNRs binary composites in supercapacitors. The specific capacitance of the MnO 2 /PANI/GNRs ternary composite can be achieved at 472 F g À1 . After 5000 cycles, the specific capacitance with 79.7% of the initial capacitance can be preserved. The enhanced specific capacitance and cycle life implies the structural stability of MnO 2 / GNRs/PANI ternary composites and the synergistic effect between MnO 2 , GNRs and PANI. a El: electrolyte type; R: current density; T: testing method. 33596 | RSC Adv., 2017, 7, 33591-33599 This journal is
Mechanically strong, electrically conductive, and flexible pristine graphene-based composite paper was prepared based on heterocyclic aramid nanoparticle-assisted liquid-phase exfoliation of graphite. The macroscopic heterocyclic aramid yarns were split and assembled into heterocyclic aramid nanoparticles with the size of *30 nm by deprotonation in dimethylsulfoxide in the presence of potassium hydroxide. The obtained heterocyclic aramid nanoparticles dimethylsulfoxide dispersion was used as good medium solvent for highly efficiency liquid-phase exfoliation of graphite. The results demonstrated that the concentration of exfoliated graphene can facile reaches *2.72 mg/mL after direct sonication of 7 h with assist of heterocyclic aramid nanoparticles. After exfoliation, the self-assembled pristine graphenebased composite paper was fabricated by vacuumassisted filtration. Due to the introduction of heterocyclic aramid nanoparticles, the self-assembled pristine graphene/heterocyclic aramid nanoparticles composite paper exhibited good mechanical property with tensile strength of *129.7 MPa, meantime, has a high electrical conductivity of *1.42 9 10 4 S/m.
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