TY - JOUR ID - 85166 TI - Modifying TiO2 nanotube using N-doping and electrochemical reductive doping as a supercapacitor electrode JO - Journal of Ultrafine Grained and Nanostructured Materials JA - JUFGNSM LA - en SN - 2423-6845 AU - Ghorbani, Faezeh AU - Khameneh Asl, Shahin AD - Department of Materials Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran. Y1 - 2021 PY - 2021 VL - 54 IS - 2 SP - 131 EP - 140 KW - TiO2 nanotube KW - supercapacitor KW - modifying KW - capacitance performance DO - 10.22059/jufgnsm.2021.02.02 N2 - 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). UR - https://jufgnsm.ut.ac.ir/article_85166.html L1 - https://jufgnsm.ut.ac.ir/article_85166_669aad3386af2d62ed164f5f186c99aa.pdf ER -