Kaya, Harun2025-10-242025-10-2420242149-0910https://doi.org/10.29132/ijpas.1388624https://hdl.handle.net/20.500.12899/1942In today's technology, carbon-based materials (such as graphene, graphene oxide, carbon nanotubes, etc.) have become one of the most important research areas due to a large number of applications. Graphene oxide (GO) is being investigated in many applications, especially in the energy field. In this study, GO was synthesized by a modified Hummer’s method. After the synthesis of GO, nickel addition to the struc-ture was made by the hydrothermal method. The morphological and structural prop-erties of the synthesized GO were characterized by scanning electron microscope (SEM), X-ray powder diffraction (XRD) and Brunauer–Emmett–Teller (BET). Ac-cording to the BET results, the surface areas of untreated GO and Ni-doped graphene oxide after heat treatment at 360°C (Ni-doped GO 360) were calculated as 3.22 m2 g-1 and 228 m2 g-1, respectively. Electrochemical properties of GO and Ni-doped GO 360 were analyzed using cyclic voltammetry (CV), long term charge/discharge analysis and impedance spectroscopy. At the end of 1000 cycles, it was determined that the Ni-doped GO 360 electrode retained 76% of its initial capacitance.eninfo:eu-repo/semantics/openAccessMaterial CharacterizationMalzeme KarekterizasyonuArticle10.29132/ijpas.13886241013746