In situ nitrogen doping of TiO₂ by plasma enhanced atomic layer deposition for enhanced sodium storage performance

Nitrogen-doped TiO₂ is in situ synthesized by plasma enhanced atomic layer deposition on carbon nanotubes (N-TiO₂/CNTs). The prepared N-TiO₂/CNT nanocomposites are employed as anode materials for sodium ion batteries. The specific capacity of an N-TiO₂/CNT electrode is 1.45 times higher than that of a TiO₂/CNT electrode at a current density of 50 mA g^-1 after 200 cycles. It is demonstrated that N-TiO₂/CNTs are more effective in an electrochemical Na cell due to the enhanced kinetics which results from the nitrogen-doping and the amorphous feature.