Kourosh Adib - Department of Chemistry, Faculty of Basic Sciences, Azarbaijan Shahid Madani University,Tabriz, Iran,Department of Chemistry, Faculty of Basic Sciences, Imam Hossein University, Tehran, Iran
Zolfaghar Rezvani - Department of Chemistry, Faculty of Basic Sciences, Azarbaijan Shahid Madani University,Tabriz, Iran
Mehdi Rahimi-Nasrabadi - Faculty of Pharmacy, Baghiatallah University of Medical Sciences, Tehran, Iran

A composite of reduced graphene oxide (RGO) with nano-sized chromium tungstate (Cr2(WO6)) was prepared using a sonochemical method. The prepared Cr2(WO6)/RGO samples were assessed through field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and FT-IR spectroscopy to obtain chemical, structural and morphological information. The resulting composite (Cr2(WO6)/RGO) was evaluated as a candidate for building supercapacitor electrodes. In this line the electrochemical performance of the tested materials were studied through cyclic voltammetry (CV), galvanostatic charge/discharge, electrochemical impedance spectroscopy (EIS), and continues cyclic voltammetry (CCV). The electrochemical tests were performed using 2 M H2SO4 solutions as the electrolyte. The evaluations on Cr2(WO6)/RGO-based electrodes revealed the material to have a specific capacitance of 473 F g-1 at a scan rate of 5 mV s-1, an energy density of 61 W h kg-1, and a high rate capability. Continues cyclic voltammetry evaluations using Cr2(WO6)/RGO-based electrodes proved the electrodes to be capable of maintaining almost 98% of its initial SC after 4000 cycles. Based on the electrochemical evaluations the synthesized nanocomposite was proven to possess the merits of both of its ingredients.