▎ 摘　　要

Two-dimensional large area graphene/carbon nanotubes (LAG-CNTs) nanocomposites as additional material for carbon-based electric double layer capacitor (EDLC) performance have been fabricated by using chemical vapor deposition method. The as-prepared LAG-CNTs are characterized with Raman, field emission scanning electron microscope, transmission electron microscope, high-resolution transmission electron microscopy and atomic force microscopy images. Finally, EDLC electrodes based with high surface area activated carbon (YP50F) and LAG-CNTs were fabricated by a facile step. The prepared electrodes (8LAG-CNTs/AC) exhibit a specific capacitance of 15.5 F cc(-1) at 0.5 mA cm(-2), excellent cycling stability (96.1 % retention after 100 cycles) and high rate capability. These excellent capacitive performances may make the as-prepared nanocomposites as conductive material for preparation of promising electrode materials of EDLC.