Growth of TiO2nanorod arrays on reduced graphene oxide with enhanced lithium-ion storage

Abstract

We demonstrate the synthesis of a sandwich-like nanocomposite by planting rutile TiO₂ nanorods onto reduced graphene oxide (RGO) via a modified seed-assisted hydrothermal growth method. The synthetic process consists of functionalization of graphene oxide (GO), followed by hydrolytic deposition of TiO₂ nanoparticles on GO and reduction, and finally hydrothermal growth of rutile TiO₂ nanorods on RGO. The resultant nanocomposite, i.e. rutile TiO₂ nanorod arrays on RGO (TONRAs–RGO), exhibits largely enhanced reversible charge–discharge capacity and rate capability compared to bare TiO₂ nanorods (TONRs) due to its unique structure and superior conductivity. The rate performance of the nanocomposite is also better than that of anatase TiO₂ nanoparticles. This study will inspire better design of RGO-based nanocomposites for high energy density lithium-ion battery applications.