Interface Engineering of MoS₂ -Modified Graphitic Carbon Nitride Nano-photocatalysts for an Efficient Hydrogen...

Understanding of photochemical charge transfer processes at nanoscale heterojunctions is essential in developing effective catalysts. Here, we utilize a controllable synthesis method and a combination of optical absorption, photoluminescence, and electrochemical impedance spectroscopic studies to investigate the effect of MoS₂ nanosheet lateral dimension and edge length size on the photochemical behavior of MoS₂ -modified graphitic carbon nitride (g-C₃ N₄ ) heterojunctions. These nano-heterostructures, which comprise interlayer junctions with variable area (i. e., MoS₂ lateral size ranges from 18 nm to 52 nm), provide a size-tunable interfacial charge transfer through the MoS₂ /g-C₃ N₄ contacts, while exposing a large fraction of surface MoS₂ edge sites available for the hydrogen evolution reaction. Importantly, modification of g-C₃ N₄ with MoS₂ layers of 39±5 nm lateral size (20 wt % loading) creates interfacial contacts with relatively large number of MoS₂ edge sites and efficient electronic transport phenomena, yielding a high photocatalytic H₂ -production activity of 1497 μmol h^-1 g_cat ^-1 and an apparent QY of 3.3 % at 410 nm light irradiation. This study thus offers a design strategy to improve light energy conversion efficiency of catalysts by engineering interfaces at the nanoscale in 2D-layered heterojunction materials.