Abstract
Hollow core–shell mesoporous TiO2 spheres have been synthesized by a hydrothermal reaction without surfactant, followed by firing at 500 °C. X-ray diffraction (XRD), scanning transmission electron microscopy (STEM), transmission electron microscopy (TEM), and Barrett–Joyner–Halenda (BJH) data reveal a mesoporous and nanosize building-block morphology with large surface area. The samples have an average pore size, surface area, and total pore volume of 8 nm, 131 m2/g, and 0.2 cm3/g, respectively. The hollow core–shell mesoporous TiO2 spheres exhibit a high capacity of >200 mAh/g with good cyclability and high rate capability as the mesoporous, nanosize building-block morphology of TiO2 spheres provides good electrical contact, accommodates the strain smoothly, and facilitates facile lithium-ion diffusion.
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