This thesis, containing three sections. In the first section, graphene oxide was synthesized by modified hummer, then it characterized by different methods such as SEM, EDX, XRD, XPS, and IR. In the secend section Pt-modi?ed nitrogen doped reduced graphene oxide, Pt@Adenine-reduced graphene oxide, and Pt@polymelamine formaldehyde modified reduced graphene oxide were prepared. The synthesized materials were characterized with different methods such as SEM, EDX, XRD, XPS, and IR and were used for electrochemical reduction of CO 2 . The products of electrochimical reduction of CO 2 on the surface of synthesized materials were detected by Raman spectroscopy, gas chromatography, 13 C-NMR spectroscopy, and gas chromatography-mass spectrometry. The analytical results identified methanol as the main product of carbon dioxide reduction. In the third section Adenine decorated@reduced graphene oxide, thermally reduced graphene oxide/polymelamine formaldehyde nanocomposite and reduced graphene oxide decorated with thionine were prepared. The synthesized materials were characterized with different methods such as SEM, EDX, XRD, XPS, and IR and were used for supercapacitor application. Supercapacitor behaviors of the synthesized materials were investigated in a three-electrode cell and 0.5 mol L H 2 SO 4 . The behavior of the nanocomposite, as a supercapacitor electrode, was examined using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. Furthermore, the stability of the electrode was examined after1000- 5000 cycles.
