Polymeric Carbon Nitride/Reduced Graphene Oxide/Fe O : All-Solid-State Z-Scheme System for Photocatalytic Overall Water Splitting.

The charge transfer between hydrogen evolution photocatalysts (HEPs) and oxygen evolution photocatalysts (OEPs) is the rate-determining step that controls the overall performance of a Z-scheme water-splitting system. Here, we carefully design reduced graphene oxide (RGO) nanosheets for use as solid-state mediators to accelerate the charge carrier transfer between HEPs (e.g., polymeric carbon nitride (PCN)) and OEPs (e.g., Fe O ), thus achieving efficient overall water splitting. The important role of RGO could also be further proven in other PCN-based Z-systems (BiVO /RGO/PCN and WO /RGO/PCN), illustrating the universality of this strategy.