PEDOT:PSS/graphene/PEDOT ternary film for high performance electrochemical electrode

For effective use of graphene and conducting polymer, a new ternary hybrid film composed of poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT:PSS), graphene, and poly (3,4-ethylenedioxythiophene) (PEDOT) has been designed and fabricated. The ternary PEDOT:PSS/graphene/PEDOT film is prepared via a two-step process: PEDOT:PSS/graphene hybrid film was spin-coated on the substrate in the first step and followed by the vapor phase polymerization (VPP) of PEDOT film on the PEDOT:PSS/graphene film in the second step. Each component in the hybrid film provides unique and crucial function to achieve optimized electrochemical properties. Volumetric capacity of ternary film (155.71 F/cm3) is much higher than that of pure VPP PEDOT film (93.66 F/cm3). The ternary film also exhibits excellent charge/discharge rate and good cycling stability, retaining 92 % of its initial charge after 5500 cycles. The enhanced electrochemical performances of such ternary composite indicate a promising future as electrode material for electrochemical energy storage devices.