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

Abstract

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 lowcost 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.