|ALANYALIOGLU Murat||Ataturk University|
|Spoluautoři TOPCU Ezgi, BAYINDIR Oguz, ERCARIKCI Elif, DAGCI Kader, OZTURK Ayse|
We have prepared graphene (Gr)/methylene blue (MB)/silver nanoparticles (AgNPs) composite electrodes by mixing each precursor in an aqueous solution and then filtering this suspension on a membrane. Gr suspensions have been prepared by using two different methods: First method includes successive electrochemical intercalation of sodium dodecyl sulfate (SDS) into graphite (oxidation) and electrochemical exfoliation of this SDS-intercalated graphite electrode (reduction). Second method is called as Hummer’s method in literature. In this method, graphite oxide is obtained by chemical oxidation of graphite and then graphite oxide is dispersed to graphene oxide in a suitable solvent under ultrasonic effect. Characterization of obtained composite papers was performed by using scanning electron microscopy, UV-vis. absorption spectroscopy, four-point-probe conductivity measurements, powder X-ray diffraction, and cyclic voltammetry techniques. We have tested electrochemical performance of these two composite free-standing electrodes by using as working electrode for reversible ferri-ferrocyanide redox system. The results indicate that the composite electrode which is prepared by using Hummer’s method exhibits better electrochemical performance than that of electrochemically prepared Gr composite electrode.