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The construction of heterojunctions provides a promising strategy to improve photocatalytic hydrogen evolution. However, how to fabricate a nanoscale TiO 2 /g-C 3 N 4 heterostructure and hinder the aggregation of bulk g-C 3 N 4 using simple methods remains a challenge. In this work, we use a simple in situ construction method to design a heterojunction model based on molecular self-assembly, which uses a small molecule matrix for self-integration, including coordination donors (AgNO 3 ), inorganic titanium source (Ti(SO 4 ) 2 ) and g-C 3 N 4 precursor (melamine). The self-assembled porous g-C 3 N 4 nanotube can hamper carrier aggregation and it provides numerous catalytic active sites, mainly via the coordination of Ag + ions. Meanwhile, the TiO 2 NPs are easily mineralized on the nanotube template in dispersive distribution to form a heterostructure via an N-Ti bond of protonation, which contributes to shortening the interfacial carrier transport, resulting in enhanced electron-hole pairs separation. Originating from all of the above synergistic effects, the obtained Ag/TiO 2 /g-C 3 N 4 heterogenous photocatalysts exhibit an enhanced H 2 evolution rate with excellent sustainability 20.6-fold-over pure g-C 3 N 4 . Our report provides a feasible and simple strategy to fabricate a nanoscale heterojunction incorporating g-C 3 N 4 , and has great potential in environmental protection and water splitting.

In Situ Construction of Ag/TiO2/g-C3N4 Heterojunction Nanocomposite Based on Hierarchical Co-Assembly with Sustainable Hydrogen Evolution