▎ 摘　　要

Artificial photosynthesis is efficient to produce fuels like hydrogen from the solar energy for solving the energy and environmental issues. The nanocomposite of TiO2 nanorod and Sb2S3 nanoparticles is developed with a low onset potential and a high photocurrent density under the framework of Z-scheme water splitting. In this study, the Sb2S3 and reduced graphene oxide (rGO) are incoporated in the TiO2 electrode respectively as the light absorber to mitigate poor visible light absorption and the conductive layer to enhance the low quantum efficiency of the intrisic TiO2. The synthesizing process for preparing Sb2S3 and rGO layers are optimized regarding to the conductivity and the photocatalytic performance of the system. The incorporation of the rGO layer cannot only enhance the conductivity but also provide a two-dimentional plane for the growth of the Sb2S3 layer. A greatly improved photocurrent density of 0.96 mA/cm(2) (measured at 0.82 V vs. RHE) is obtained for the TiO2/rGO/Sb2S3 electrode in a 0.5 M Na2SO4 aqueous solution under AM 1.5 G illumination, as compared with those for the TiO2/Sb2S3 (0.75 mA/cm(2)) and TiO2 (0.15 mA/cm(2)) electrodes measured under the same condition. The electrochemical impedance spectroscopy (EIS) technique is applied to analyze the charge-transfer resistance of system. (C) 2016 Elsevier Ltd. All rights reserved.