Enhanced Charge Separation and Transfer of Fe2O3@Nitrogen‐Rich Carbon Nitride Tubes for Photocatalytic Water Splitting

Carbon nitride is widely used in photocatalytic hydrogen production, but it is still difficult to split water without any sacrificial reagent. Herein, nanosized Fe 2 O 3 is combined with 3D nitrogen‐rich carbon nitride tubes (ACN), to form an Fe 2 O 3 @ACN Z‐scheme heterojunction, which accelerates the electrons’ transfer from Fe 2 O 3 to ACN and improves the charge separation efficiency. Meanwhile, the bandgap of Fe 2 O 3 @ACN is about 2.01 eV, beneficial to the enhancement of visible light absorption capacity. As a result, without any sacrificial agent, the hydrogen evolution rate reaches 3.7 μmol h −1 (10 mg catalyst, AM1.5) through water splitting, which is three times that of ACN and 45 times that of bulk C 3 N 4 (GCN). This work provides a new strategy to prompt pure water splitting based on carbon nitride catalysts.