“…Combining two different semiconductors to construct a heterostructure is an effective strategy for enhancing photocatalytic performance, [17][18][19] which should be attributed to the fact that the heterostructure usually has smaller bandgap than the single semiconductor, and the formation of the built-in electric field in the heterostructure interface area can hinder photogenerated carriers. A series of heterostructures, such as C 2 N/ InTe, [20] AlN/WS 2 , [21] MoTe 2 /CrS 2 , [22] GaN/Mg(OH) 2 , [23] MoS 2 / CdS, [24] CdS/C 2 N, [25] CdS/ZnSe, [26] BlueP/Mg(OH) 2 , [27] BiNbO 4 /ZnWO 4 , [28] C 60 /g-C 3 N 4 , [29] SiC/MoS 2 , [30] and GaN/ BlueP, [31] exhibit enhanced photocatalytic performance. Especially, some ZnO monolayer-based heterostructures are ZnO/MoS 2 , [32,33] ZnO/WS 2 , [34] ZnO/WSe 2 , [35] ZnO/AlN, [36] and N-ZnO/g-C 3 N 4 .…”