Effect of chemical bath deposited V₂O₅ on TiO₂ nanotubes for supercapacitor application

In this study, the supercapacitor activities of TiO₂ nanotubes (T0) were improved by V₂O₅ nanoparticles, which were named hereafter T1, T2, T3, T4, and T5. TiO₂ nanotube arrays (TNA) were synthesized by the anodic oxidation process and were modified via the chemical bath deposition using vanadium alkoxide, followed by final annealing. All samples were characterized by several techniques such as FE-SEM, EDAX, and XRD. The supercapacitive activities of the modified TNA’s nanomaterials were investigated via some electrochemical tests. Cyclic voltammograms were collected at a scan rate of 50 mVs⁻¹, and areal capacitances were calculated from these curves. It was observed that the areal capacitance of modified TNAs increased compared to bare TNA. Indeed, the supercapacitor performances of the V₂O₅-modified TNAs were enhanced by the increase of deposition time of the vanadium alkoxide. Besides, the impact of electrolyte type on TNA’s performance was studied, and the results proved the high performance of TNA in the presence of HClO₄.