▎ 摘　　要

The decoration of polypyrrole (Ppy) quantum dots on graphene oxide (GO), Ppy/GO, composite is prepared through the in situ polymerization process. The chemical structure of Ppy, GO, and Ppy/GO is confirmed using XRD, XPS, and FTIR analyses. The morphologies are confirmed using SEM and TEM analyses, in which TEM confirms the formation of quantum dot Ppy with an average particle size of 5 nm decorated on GO sheets. The Ppy/GO composite has a great optical property related to the absorbance in UV, Vis, and near IR region, with a small bandgap of (1.66 eV). These properties qualify the prepared composite for application as photoelectrode for H-2 gas evolution from sewage water (third treated stage, pH 7.2). The H-2 evolution rate is represented by the electrochemical measurements of current density (J(ph)). The effect of on/off chopped light on the responsivity of the photoelectrode is mentioned, in which the J(ph) values increase from - 4 to - 12 mu A cm(-2), respectively. Moreover, the J(ph) value changed from - 4.32 to - 4.89 mu A cm(-2), with decreasing in the monochromatic wavelengths from 730 to 440 nm, respectively. This electrochemical testing study confirms the ability of the Ppy/GO thin film photoelectrode for H-2 gas production from wastewater.