en گروه سرامیک Ceramic Materials and Engineering Research Paper Research Paper The graphene oxide -TiO₂ (GO-TiO₂) and pre-reduced graphene oxide -TiO₂ (rGO-TiO₂) nanocomposites were fabricated successfully by hydrothermal method. The microstructure of synthesized nanocomposites was investigated using field emission scanning electron microscopy (FESEM) equipped with energy dispersive spectroscopy (EDS) analysis. Moreover, galvanostatic charge/discharge (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) methods in three electrode system were applied to evaluate electrochemical properties. The results revealed that nanoparticles distributed more uniformly on graphene sheets, at lower concentrations of TiO₂. The rGO-TiO₂ and GO-TiO₂ nanocomposites showed 224 and 32 F/g specific capacitance at 5 mV s^-1 scan rate in 1 M KOH aqueous electrolyte, respectively. The pre-reduction of graphene oxide is the main reason for the better electrochemical performance of rGO-TiO₂ nanocomposite compared to GO-TiO₂ nanocomposite. Pre-reduction,Nanocomposite,Hydrothermal,Reduced Graphene Oxide,Supercapacitor,TiO2. 55 61 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-1978-1&slc_lang=en&sid=1 Z. Abasali Karaj Abad zeinab.abasali95@student.sharif.ir 1800319475328460011413 1800319475328460011413 No Department of Materials Science and Engineering, Sharif University of Technology A. Nemati nemati@sharif.edu 1800319475328460011414 1800319475328460011414 Yes Department of Materials Science and Engineering, Sharif University of Technology A. Malek Khachatourian khachatourian@sharif.edu 1800319475328460011415 1800319475328460011415 No Department of Materials Science and Engineering, Sharif University of Technology M. Golmohammad mgolmohammad@nri.ac.ir 1800319475328460011416 1800319475328460011416 No Renewable Energy Department, Niroo Research Institute (NRI)