▎ 摘　　要

In the present work, graphene/polypyrrole/carbon nanotube (GN/PPy/CNT) ternary composites have been fabricated via in situ polymerization method. The negatively charged poly(sodium 4-styrene sulfonate) is used for dispersing GN and CNT in aqueous phase and tethering pyrrole monomer to facilitate the formation of uniform PPy coating. Morphology analysis shows that the stacking of laminated PPy/GN composite is inhibited by introducing one-dimensional CNT to form GN/PPy/CNT composite with three-dimensional hierarchical structure. The prepared GN/PPy/CNT composite with GN:CNT = 8:1 (8GCPPy) exhibits a large surface area of 112 m(2) g(-1) and meso- and macro-porosity system, which favor the diffusion of the electrolyte ions into the inner region of electrode. The supercapacitive behaviors of the sample electrodes are evaluated with cyclic voltammetry and galvanostatic charge/discharge measurements in 1 M KCl electrolyte. The specific capacitance of 8GCPPy at a current density of 0.2 A g(-1) (361 F g(-1)) is much higher than that of pure PPy (176 F g(-1)) and binary composites of CNT/PPy (253 F g(-1)) and GN/PPy (265 F g(-1)). In addition, owing to the GN and CNT synergistic releasing the intrinsic differential strain of PPy chains during charge/discharge processes, the 8GCPPy composite also shows stable cycling performance (4% capacity loss after 2000 cycles). (C) 2012 Elsevier Ltd. All rights reserved.