▎ 摘　　要

This paper reports on a new strategy using a combination of graphene protective layer and amorphous molybdenum sulfide (MoSx) H-2-evolving catalyst layer to form a hybrid coating layer that enhances both photocatalytic activity and stability of the p-Cu2O photocathode for the solar H-2 generation in water. Graphene sheet was transferred from a copper substrate onto the p-Cu2O electrode surface by a simple solution process, resulting in the creation of p-Cu2O/Gr. A layer of MoSx was deposited further to generate a hybrid p-Cu2O/Gr/MoSx photocathode. In a pH 7 phosphate buffer electrolyte and under 1 Sun light illumination, at the applied potential of 0 V vs. reversible hydrogen electrode (RHE), the resultant p-Cu2O/Gr and p-Cu2O/Gr/MoSx show 7-fold superior catalytic activity and significant enhancement of the stability compared to a pristine p-Cu2O photocathode. The obtained results demonstrate that the p-Cu2O/Gr and p-Cu2O/Gr/MoSx photocathodes are very promising for photoelectrochemical cell water splitting. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.