▎ 摘　　要

Graphene film was formed on the surface of titanium dioxide nanotube (TiO2 NT) arrays through in situ electrochemical reduction of a graphene oxide dispersion by cyclic voltammetry. The residual oxygen-containing groups and other structural defects such as sp(3)-hybridized carbons in the electrodeposited graphene were further removed by photo-assisted reduction of the underlying TiO2 NTs, thus achieving the maximum restoration of pi-conjugation in the graphene planes. Spectroscopic, electrochemical, and photoelectrochemical techniques were used to characterize the graphene films, and the use of the resulting graphene-TiO2 NT material in photocatalysis was investigated. The results showed that the graphene-TiO2 NT material exhibited a greatly improved photocatalytic activity compared with unmodified TiO2 NTs. (C) 2011 Elsevier Ltd. All rights reserved.