Three-dimensional porous graphene/polyaniline composites for high-rate electrochemical capacitors

We report an electrochemical co-deposition method to prepare three-dimensional (3D) porous composites of reduced graphene oxide (rGO) and polyaniline (PANI) with pores vertically oriented on the surfaces of current collectors and used as an electrode material for electrochemical capacitors (ECs). These composites showed much higher areal specific capacitances and greatly improved rate capability than those of PANI. Typically, the rGO/PANI composite film with a thickness of 150 mu m exhibited a high areal specific capacitance (C-a, 67.2 mF cm(-2)), small relaxation time constant (tau(0), 316 ms) and good electrochemical stability, promising for the fabrication of a high-rate EC.