Polymeric Carbon Nitride/Reduced Graphene Oxide/Fe₂O₃: All‐Solid‐State Z‐Scheme System for Photocatalytic Overall Water Splitting

Abstract

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., Fe₂ O₃ ), thus achieving efficient overall water splitting. The important role of RGO could also be further proven in other PCN-based Z-systems (BiVO₄ /RGO/PCN and WO₃ /RGO/PCN), illustrating the universality of this strategy.