Adjust the electrochemical performances of graphene oxide nanosheets-loaded poly(3,4-ethylenedioxythiophene) composites for supercapacitors with ultralong cycle life

The graphene oxide nanosheets-loaded poly(3,4-ethylenedioxythiophene) (GO/PEDOT) intercalation composites have been fabricated successfully with a facile electrochemical method. The varying deposition time was implemented to investigate the effect of loading amount on electrochemical behavior of the composites. The GO/PEDOT nanocomposites showed the superior capacitive behaviors, and achieved a high areal capacitance of 66.3 mF cm−2 at 10 mV s−1 cyclic voltammetry (CV) scan. The scanning electron microscope characterization indicated different deposition time would significantly affected the curly sheet-like morphology of composites. Moreover, the composite films prepared with longer deposition time exhibited relatively lower capacitance value at the fast CV scan. Meanwhile, the galvanostatic charge/discharge tests indicated moderate deposition time was more suitable for the fast charge/discharge. In particular, a stability test of 20,000 CV cycles revealed the composites had the ultra long cycle life. We consider that the highly stable GO/PEDOT nanocomposites with superior capacitive behaviors are very promising for high-performance electrochemical energy storage.