Coupling of Crumpled-Type Novel MoS with CeO Nanoparticles: A Noble-Metal-Free p-n Heterojunction Composite for Visible Light Photocatalytic H Production.

In terms of solar hydrogen production, semiconductor-based photocatalysts via p-n heterojunctions play a key role in enhancing future hydrogen reservoir. The present work focuses on the successful synthesis and characterization of a novel p-MoS/n-CeO heterojunction photocatalyst for excellent performance toward solar hydrogen production. The synthesis involves a simple in situ hydrothermal process by varying the wt % of MoS. The various characterization techniques support the uniform distribution of CeO on the surface of crumpled MoS nanosheets, and the formation of p-n heterojunction is further confirmed by transmission electron microscopy and Mott-Schottky analysis. Throughout the experiment, it is demonstrated that 2 wt % MoS in the MoS/CeO heterojunction photocatalyst exhibits the highest rate of hydrogen evolution with a photocurrent density of 721 μA cm. The enhanced photocatalytic activity is ascribed to the formation of the p-n heterojunction that provides an internal electric field to facilitate the photogenerated charge separation and transfer.