%0 Journal Article %T Modifying TiO2 nanotube using N-doping and electrochemical reductive doping as a supercapacitor electrode %J Journal of Ultrafine Grained and Nanostructured Materials %I University of Tehran %Z 2423-6845 %A Ghorbani, Faezeh %A Khameneh Asl, Shahin %D 2021 %\ 12/27/2021 %V 54 %N 2 %P 131-140 %! Modifying TiO2 nanotube using N-doping and electrochemical reductive doping as a supercapacitor electrode %K TiO2 nanotube %K supercapacitor %K modifying %K capacitance performance %R 10.22059/jufgnsm.2021.02.02 %X AbstractThe relatively small specific capacitance along with poor electrochemical activity and weak electrical conductivity of TiO2 has resulted in several studies on the methods of modifying TiO2. In this study, a different mechanism for improving the electrochemical properties of TiO2 nanotubes is employed. Nitrogen doping of TiO2 nanotube arrays fabricated using two-step anodization was used to narrow the bandgap of TNTs as a non-metal doping technique. To better demonstrate the impact of the nitrogen content on enhancing the electrochemical activity, TNTs were immersed in 0.5, 1, 2, 4, and 8 molars of ammonia solution. Electrochemical reductive doping was implemented on TNT and N-TNT. The phase structure and surface morphologies of the as-prepared TiO2 nanotubes were identified by X-ray diffraction (XRD), field scanning electron microscope (FSEM) and Fourier transformed infrared spectroscopy (FT-IR) measurements. The electrochemical response of the TiO2 NTAs following nitrogen and electrochemical doping was evaluated using cyclic voltammetry (CV), galvanostatic charge-discharge tests, and electrochemical impedance spectroscopy (EIS). The electrochemical measurements of the modified samples confirmed that a noticeable improvement was achieved in the electrochemical behavior and that the areal capacitance of R-N-TNT was roughly 400 orders of magnitude greater than that of TNT with long-term stability (93% of its initial capacitance after 500 cycles). %U https://jufgnsm.ut.ac.ir/article_85166_669aad3386af2d62ed164f5f186c99aa.pdf