Trace Au Induced Growth of Mixed-Phase MoS₂ Nanosheets on 2D g-C₃N₄ to Facilitate the Well-Organized Charge Migration in Photocatalytic H₂ Evolution

The development of high performance, stable, and low-cost catalysts is of great significance to the practical application of photocatalytic technology. By inserting a trace amount of Au between two-dimensional g-C 3 N 4 nanosheets (CNN) and MoS 2, we have successfully constructed a CNN/Au/MoS 2 ternary hybrid with the mixed-phase MoS 2 . The obtained sample displayed much improved H 2 evolution ability with nearly 92% decreased cost of the noble metal. The introduction of Au not only facilitates the high dispersion of MoS2 but also significantly induces the formation of 1T MoS 2, thus providing low-cost cocatalyst and semiconductor at the same time in the photocatalyst. Moreover, interfacial Au induces the formation of the Z-scheme heterostructure between CNN and 2H MoS 2, guaranteeing a relatively high reduction ability of the photogenerated electrons. This work provides a new pathway to manipulate the transfer and separation behaviors of charge carriers in heterostructure photocatalysts.