▎ 摘　　要

A seeded TiO2 nanorod decorated with reduced graphene oxide (rGO) was synthesized to improve solar hydrogen production performance in a photoelectrochemical cell. The rutile TiO2 nanorod was grown on the surface of the screen-printed anatase TiO2/fluorine-doped tin oxide (FTO) substrate via hydrothermal technique and then rGO was deposited on the surface of seeded TiO2 nanorod by spin-coating and thermal treatment. The photocatalytic activities are evaluated in terms of hydrogen production and photoelectrochemical properties. Xray diffractometer and transmission electron microscopy show the presence of anatase and rutile TiO2 with different lattice fringes and rGO on the surface of the photocatalyst. Field-emission scanning electron microscopy reveals that introducing seed layer increased the density of the nanorod and its active surface area. X-Ray photoelectron spectroscopy (XPS) and Raman spectra confirmed a strong interaction between TiO2 and rGO, leading to better charge carrier transfers and reduce their recombination rate. The photocurrent density of seeded TiO2 nanorod@ rGO was higher than rutile or anatase TiO2@rGO due to low charge transfer resistance and long electron lifetime. The seeded TiO2 nanorod@ rGO composites produced a maximum accumulative hydrogen of 1200 mmol/cm(2) in a mixture of 1 M KOH and 5 vol% glycerol in the photoelectrochemical cell under visible light irradiation compared with ruffle or anatase TiO2@rGO. It is believed that this predominant photocatalytic activity is due to the synergistic contribution of direct electron transport between anatase and rutile TiO2 phases, a high electron mobility of rGO and an increased surface area originated from TiO2 nanorod.