A 2D/3D Heterojunction Photocatalyst Using 2D Nanosheet Sm2MoO6 on 3D Spherical NiS: A Novel High‐Efficiency Photocatalyst

The 2D nanosheet Sm 2 MoO 6 is mounted on a bulk 3D NiS to form a durian‐like 2D/3D heterojunction photocatalyst, and the photocatalytic activity is studied. The photocatalytic activity of the optimal composite catalyst is 8.3 times higher than that of NiS. Compared with Sm 2 MoO 6 , it is increased by 186.7 times. On the one hand, it may be attributed to the assembly of 2D nanosheets onto a massive 3D structure, effectively preventing the problem of stacking due to high surface energy and interlayer van der Waals attraction. The specific surface area of the catalyst is expanded to provide more active sites, which facilitates contact of the catalyst with the sensitizer and the sacrificial agent. On the other hand, Sm 2 MoO 6 as a rare earth cocatalyst, the activation energy required for the surface reaction can be lowered, and the electron–hole separation ability can be improved.