Low dimensional materials have been examined as electrocatalysts for the hydrogen evolution reaction (HER). Among them, two-dimensional Transition Metal Dichalcogenides (2D-TMDs) such as MoS 2 have been identified as potential candidates. However, the performance of TMDs towards HER in both acidic and basic media remains inferior to that of noble metals such as Pt and its alloys. This calls for investigating the influence of controlled defect engineering of 2D Hydrothermal synthesis 6.5ű0.04

Nanolaminate membranes made of two-dimensional materials (2D) such as graphene oxide (GO) are promising candidates for molecular sieving via size-limited diffusion in the 2D capillaries, but high hydrophilicity makes these membranes unstable in water. Here, we 25 report a nanolaminate membrane based on covalently functionalized molybdenum disulfide (MoS 2 ) nanosheets. The functionalized MoS 2 membranes demonstrate >90% and ~ 87% rejection for micropollutants and NaCl respectively when operating under reverse osmotic conditions. The sieving performance and water flux of the functionalized MoS 2 membranes are attributed to both control of the capillary widths of the nanolaminates and 30 control of the surface chemistry of the nanosheets. We identified small hydrophobic 20 12 References