▎ 摘　　要

Conformal structured TiO2-reduced graphene oxide composite nanosheets (TiO2@rGO CNS) have been synthesized by a one-step hydrothermal method. The prepared TiO2 composite features a two-dimensional (2D) structure with an ultra-large specific surface area of 269 m(2) g(-1) and homogeneous TiO2 nanoparticles directly grown on the surface of reduced graphene oxide (rGO) sheets. With this special architecture of 2D sheet, it gives rise to improve light-harvesting and photo-to-electron conversion efficiency. When the TiO2@rGO CNS incorporated into the photoanode, it exhibits a greatly enhanced absorption in the visible range and low charge transfer resistance of 10.16 ohm compared with that of bare TiO2-based electrode (15.22 ohm). When the rGO content in TiO2@rGO CNS is 0.8 wt%, the fabricated solar cell obtains a remarkably enhanced power conversion efficiency (up to 7.05%), compared with that of the bare TiO2-based solar cell (4.36%), where the short-circuit current density, open-circuit voltage, and fill factor of the device are 13.63 mA cm(- 2), 0.712 V, and 0.69, respectively. With the above-mentioned merits, this work supplies a feasible approach for the functionalization of 2D materials decorated with controlled metal oxide nanoparticles, which is expected as a promising material in high-performance photovoltaic devices for practical applications.