@article { author = {Ghorbani, Faezeh and Khameneh Asl, Shahin}, title = {Modifying TiO2 nanotube using N-doping and electrochemical reductive doping as a supercapacitor electrode}, journal = {Journal of Ultrafine Grained and Nanostructured Materials}, volume = {54}, number = {2}, pages = {131-140}, year = {2021}, publisher = {University of Tehran}, issn = {2423-6845}, eissn = {2423-6837}, doi = {10.22059/jufgnsm.2021.02.02}, abstract = {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).}, keywords = {TiO2 nanotube,supercapacitor,modifying,capacitance performance}, url = {https://jufgnsm.ut.ac.ir/article_85166.html}, eprint = {https://jufgnsm.ut.ac.ir/article_85166_669aad3386af2d62ed164f5f186c99aa.pdf} }