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N-doped carbon coated anatase TiO 2 nanoparticles as superior Na-ion battery anodes.

N-doped carbon coated TiO2 nanoparticles (TiO2 @NC) were synthesized through a simple two-step route, in which dopamine was simultaneously utilized as both nitrogen and carbon sources. With TiO2 @NC applied in the Na-ion battery (SIB) anodes, the continuous and uniform N-doped carbon layer can not only enhance the electrical conductivity of TiO2 and facilitate the surface pseudocapacitive process, but also serve as a buffer layer to accommodate the volume expansion during the sodiation-desodiation processes. The as-prepared TiO2 @NC exhibits excellent electrochemical performance when utilized as the SIB anodes, which delivers a remarkably high reversible capacity of 250.2 mAh g-1 at a rate of 0.25C (84 mA g-1 ) after 200 cycles and still retains 122.1 mAh g-1 at 10C (3.35 A g-1 ) even after 3000 cycles accompanied with a 95.3% retention of the maximum capacity, outperforming most of the reported TiO2 /C-based composites as SIB anodes. To our best knowledge, the preparation of TiO2 @NC with dopamine as both nitrogen and carbon sources and its application in the SIB anodes are reported for the first time.

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