engleski

Electrochemical synthesis and characterisation of composites based on conductive polymers and graphene oxide

In this work an electrochemical approach for exfoliation of graphite and synthesis of composites based on conductive polymers and graphene oxide (GO) was studied. The overall procedure is simple and effective way of composite electrode formation that does not require any additional purification or isolation of products as it is expected for composites prepared by chemical method [1]. The experiments were conducted in two steps. In the first step, GO was prepared by electrochemical exfoliation of natural graphite flakes in sodium dodecyl sulphate (SDS) and sodium dodecyl benzene sulfonate (SDBS) aqueous solutions. Graphite electrode was alternately polarized at positive and negative potentials by using two-electrode system. During positive polarization, SDS and SDBS were intercalated within the structure of graphite, and oxygen evolution as well as carbon oxidation took place. By applying negative potential, cations were intercalated within graphite and also hydrogen evolution took place. The exfoliation process was followed by monitoring current transients. The obtained product was characterized by ultraviolet-visible spectrophotometry (UV/Vis), Raman spectroscopy and atomic force microscopy (AFM). In the second step, monomer (pyrrole or 3, 4- ethylendioxythiophene) was dissolved in a solution obtained during first step and electrochemical synthesis of polypyrrole and poly(3, 4-ethylendioxythiophene) was carried out. The obtained nanocomposites were characterized by means of scanning electron microscopy (SEM). The electrochemical measurements were performed by cyclic voltammetry (CV), and ion exchange behaviour of obtained composite material was studied by using the electrochemical quartz crystal nanobalance (EQCN).The obtained results has shown that GO was intercalated within the polypyrrole or poly(3, 4-ethylendioxythiophene) layers and it has affected the properties of the obtained layers.

polypyrrole, poly(3, 4-ethylendioxythiophene), supercapacitors

nije evidentirano