▎ 摘　　要

Photoelectrochemical (PEC) water splitting is the latest technology to produce hydrogen and electricity by using sunlight. The low bandgap of tungsten oxide (WO3) enables it as a suitable candidate for PEC water splitting. Reduced graphene oxide (rGO) is a material having extra thin sheets and a very large surface area with extreme conductivity. Graphene oxide (GO) has been synthesized by using a modified Hummer's method. Hydrothermal reduction of GO gives rGO. WO3-graphene composites of different ratios have been prepared hydrothermally and then coated on indium tin oxide coated glass to make electrodes for water splitting. Various characterization techniques such as UV-visible spectroscopy, diffusion reflectance spectroscopy, X-ray diffraction, scanning electron microscopy, and linear sweep voltammetry (LSV) were used to study the absorbance/reflectance, structure, morphology, and optical/electrical properties of prepared nanostructures. In addition, WO(3)particles were distributed on the strong sheets of rGO randomly. The IV-measurements were taken of rGO/WO3 electrodes under dark environment (very minor current similar to 250 nA) by using LSV. The electrodes exhibit maximum similar to 450 mu A under dark environment, while photocurrent initiates from 1.0 mA to 3.2 mA under artificial sunlight. That is convincingly an exceptional result in the field of PEC cell.