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Electrochemical anodized titanium dioxide (TiO 2 ) nanotubes are of immense significance as electrochemical energy storage devices owing to their fast electron transfer by reducing the diffusion path and paving way to fabricating binder-free and carbon-free electrodes. Besides these advantages, when nitrogen is doped into its lattice, doubles its electrochemical activity due to enhanced charge transfer induced by oxygen vacancy. Herein, we synthesized nitrogen-doped TiO 2 (N-TiO 2 ) and studied its electrochemical performances in supercapacitor and as anode for a lithium-ion battery (LIB). Nitrogen doping into TiO 2 was confirmed by Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) techniques. The electrochemical performance of N-TiO 2 nanotubes was outstanding with a specific capacitance of 835 µF cm -2 at 100 mV s -1 scan rate as a supercapacitor electrode, and it delivered an areal discharge capacity of 975 µA h cm -2 as an anode material for LIB which is far superior to bare TiO 2 nanotubes (505 µF cm -2 and 86 µA h cm -2 , respectively). This tailor-made nitrogen-doped nanostructured electrode offers great promise as next-generation energy storage electrode material.

Electrochemical Performance of Nitrogen-Doped TiO2 Nanotubes as Electrode Material for Supercapacitor and Li-Ion Battery