Electrochemical synthesis of layer-by-layer reduced graphene oxide sheets/polyaniline nanofibers composite and its electrochemical performance

A layer-by-layer (LBL) reduced graphene oxide sheets/polyaniline nanofibers (GNS/PANI) composite was developed by electrodepositing conductive polymer PANI nanofibers onto the electrically conductive GNS nanosheets to form a multilayer configuration. SEM results showed that the obtained GNS/PANI composite film had a clear open multilayer structure. The electrochemical performances of the obtained materials were analyzed by cyclic voltammetry (CV), electrochemical impedance spectrometry (EIS) and chronopotentiometry. Comparing with pure PANI electrode, GNS/PANI multilayer composite displayed an improved capacitive performance (5.16 F cm(-2)), good rate capability and improved cycle performance, with capacity retention of about 93% after 1000 charge-discharge cycles. The good electrochemical performances of GNS/PANI composite was contributed to the modification of GNS sheets surface, the open layer-by-layer structure and the synergic effect of the two components. Therefore, such method has good application potential to fabricate other composite for supercapacitors or other power source systems. (C) 2013 Elsevier Ltd. All rights reserved.