A Metal‐Organic‐Framework‐Derived g‐C 3 N 4 /α‐Fe 2 O 3 Hybrid for Enhanced Visible‐Light‐Driven Photocatalytic Hydrogen Evolution

As one of the most efficient systems for photocatalytic hydrogen evolution, the Z‐Scheme system, consisting of different semiconductors with a reversible donor–acceptor pair, has attracted great attention. Considering the non‐toxicity and low cost of photocatalysts, a series of g‐C 3 N 4 /α‐Fe 2 O 3 hybrids were rationally constructed based on the Z‐Scheme mechanism for the first time, using a metal‐organic framework template approach that can fine tune the compositions and properties of the hybrids. An optimized hybrid, g‐C 3 N 4 /α‐Fe 2 O 3 ‐2, exhibited prominent photocatalytic water splitting performance with a visible light response. Under irradiation of visible light ( λ >420 nm), the hybrid shows a high durability and superior hydrogen production rate of 2066.2 μmol g −1  h −1 from water splitting, which is approximately three times greater than that of bulk g‐C 3 N 4 because of the effective separation of photo‐excited charge carriers by two narrow band gap semiconductors, tightly coupled with the Z‐Scheme structural feature.