SYNTHESIS AND ELECTROCHEMICAL PROPERTIES OF GRAPHENE//CONDUCTING POLYMER TERNARY COMPOSITE FOR SUPERCAPACITORS.

Graphene(RGO)//[N-butyl-3,6-carbazolevinylene-alt-(2,5-dioctyloxy)-p-phenylenevinylene] (PPH-CAR) ternary nanocomposite is fabricated by a simple two-step method, which includes electrochemical reduction of graphene oxide (GO) and oxidation of simultaneously and an ultrathin PPH-CAR layer coated on the RGO/ surface. The structure of the composite is investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and field-emission scanning electron microscopy (FESEM). The results suggest that the composite is correctly synthesized and each component has good dispersion. Cycle voltammetry (CV), charge and discharge measurements and cycle stability test are used to evaluate its electrochemical performance. Because of the synergistic effect of each component, the composite exhibits excellent electrochemical properties with specific capacitance of 175 F/g, which is a 46% increase compared with RGO/. Moreover, it reveals outstanding cycling performance with more than 90% capacitance retention over 1000 cycles. Such ternary composite is a candidate for high performance supercapacitors with great promise. RGO/MnO2/PPH-CAR ternary nanocomposite was successfully fabricated via a simple two-step method. The electrochemical performance of the composite was measured and the results show great improvement in conductivity, specific capacitance and Nyquist impedance. It is indicating that the conducting polymer offers interparticle connectivity and facilitates electron transport among each component. The improved electrochemical properties of the composite are attributed to the synergistic effect of each component and this kind of ternary composite is a promising candidate for high performance of electrochemical supercapacitors. [ABSTRACT FROM AUTHOR]