Characterization of defect structures in nanoscaled W-doped TiO2 tested as supercapacitor electrode materials

Ammar, Ameen Uddin and Stefan, Maria and Macavei, Sergiu Gabriel and Tripon, Septimiu and Pana, Ovidiu and Leostean, Cristian and Vlaicu, Ioana Dorina and Rostas, Arpad Mihai and Erdem, Emre (2023) Characterization of defect structures in nanoscaled W-doped TiO2 tested as supercapacitor electrode materials. Journal of Materials Science: Materials in Electronics, 34 (2). ISSN 0957-4522 (Print) 1573-482X (Online)

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In this work, Tungsten(W)-doped TiO 2 nanoparticles were synthesized using the sol–gel method and were used as electrode materials in supercapacitor applications. The structural and morphological properties of the prepared samples were analyzed by means of XRD, STEM, TEM, and XPS. The analysis of the defect centers was carried out using EPR spectroscopy. The electrochemical analysis of the assembled supercapacitor was done using cyclic voltammetry, galvanostatic cycling with potential limitation technique, potentiostatic electrochemical impedance spectroscopy, and voltage-holding experiments. All the presented samples showed paramagnetic defects in the EPR analysis, while 0.5% W-doped TiO 2 showed a maximum signal intensity. The supercapacitor performance from the synthesized electrode material showed highly encouraging results. The equivalent series resistance (Rs) value for all the designs showed values under “1 Ω ,” which reflects high conductivity. As the maximum EPR intensity comes from TiO 2 doped with 0.5% W, the supercapacitor performance of this sample was tested with a newly designed five-electrode system. This design showed superior performance compared to any other used designs with a specific capacitance of 25.5 F g- 1, with an energy density of 14.16 Wh kg- 1 at 302 kW kg- 1.
Item Type: Article
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Emre Erdem
Date Deposited: 16 Apr 2023 16:44
Last Modified: 16 Apr 2023 16:44

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