F-doped TiO₂(B)/reduced graphene for enhanced capacitive lithium-ion storage

A composite of F-doped TiO₂(B) and reduced graphene oxide (F-TiO₂(B)/rGO) was successfully synthesized via a one-step hydrothermal route. It was found that the introduction of F ions in the synthetic process has led to the uniform dispersion of TiO₂(B) on rGO nanosheets. The F ions have also been doped into the lattice of TiO₂(B), which greatly improved the conductivity of the materials. Consequently, this composite delivered a large capacity of 249.4 mA h g^-1 at 0.2 A/g. It also demonstrated a capacity of 203.1 mA h g^-1 and an excellent capacity retention of 96% after 500 cycles even at a high current density of 2 A/g.