Semnan University Press Progress in Physics of Applied Materials 2783-4794 5 1 2025 05 01 Hydrothermal Synthesis of Chitosan Nitrogen-Doped Graphene for Supercapacitors Applications 85 95 9586 10.22075/ppam.2025.36551.1128 EN Fatemeh Khojasteh Nanophysics Research Lab (NRL), Department of Physics, Central Tehran Branch, Islamic Azad University, 14696-69191, Ayatollah Hashemi Complex in Poonak, Tehran, Iran Salimeh Kimiagar Department of Physics, Central Tehran Branch, Islamic Azad University, 14696-69191, Ayatollah Hashemi Complex in Poonak, Tehran, Iran 0000-0002-5818-0337 Journal Article 2025 01 11 In this paper, a chitosan nitrogen-doped graphene (CNGO) electrode is synthesized by using carbon paper (CP). This electrode demonstrates enhanced electrochemical properties as a supercapacitor electrode compared to CP. The CNGO nanocomposite is synthesized using a hydrothermal method and is deposited on CP via dip coating method. To characterize the CNGO nanocomposite, X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and energy dispersive spectroscopy (EDS) mapping analyses are performed. The electrochemical properties of the electrodes are studied through cyclic voltammetry, galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy. The specific capacitance is increased from  for the CP to  for the CNGO electrodes at a current density of  . The reversibility ratio is calculated to be 0.89 and 0.94 for CP and CNGO electrodes, respectively. The proposed electrode demonstrates exceptional performance due to its outstanding stability and durability over extended cycling, as evidenced by its 100% capacitance retention after 1100 charge-discharge cycles. This remarkable retention highlights its ability to maintain consistent electrochemical properties under prolonged and repetitive operational conditions. The results indicate that the presence of CNGO nanocomposite on CP enhances the electrochemical properties of the electrode.  https://ppam.semnan.ac.ir/article_9586_fc1f83f2423348d5ab7793339a81576e.pdf