Rational Fabrication of One‐Dimensional TiO2 Nanowires for Enhanced Supercapacitor and Rechargeable Lithium Ion Battery

Abstract Hydrothermal synthesis of titanium dioxide nanowires yields high‐purity and well‐developed grains while exhibiting a low degree of aggregation. TiO2‐0.5 and TiO2‐0.7 (0.5 ml and 0.7 ml tetrabyl titanate were added to the mixture for TiO2‐0.5 and TiO2‐0.7) are obtained by varying the content of tetrabutyl titanate through a simple to obtain nanowire particles, followed by annealing at 500 °C in air. The electrochemical properties of the nanoparticles can be improved solely by adjusting the amount of tetrabutyl titanate. Herein, TiO2‐0.5 and TiO2‐0.7 were synthesized, and their electrochemical performance as negative electrodes for Lithium‐ion batteries (LIBs) and supercapacitors was investigated. As a negative electrode for LIBs, the reversible capacity of TiO2‐0.7 nanomaterial after 65 cycles at a current density of 100 mA/g is 221.9 mAh/g. In contrast, at current densities of 200 mA/g, 300 mA/g, and 500 mA/g, it is measured as 173.8 mAh/g, 148.4 mAh/g, and 120 mAh/g, respectively. As a supercapacitor electrode material, TiO2‐0.7 exhibited a specific capacitance of 121.8 F/g at a current density of 0.2 A/g. These results suggest that this electrode material material has great potential for portable electronic devices in the future due to its ability to modulate the concentration of TiO2 nanowires (TiO2 NWs) by adjusting the content of tetrabutyl titanate.