1T-phase MoS2/holey ultrathin g-C3N4 nanosheets based 2D/2D heterostructure for enhanced photocatalytic hydrogen production

Although graphitic carbon nitride (g-C₃N₄) is widely used for photocatalytic hydrogen production, its practical application is restricted by the high recombination rate of photoinduced electron-hole pairs and limited active sites. In this work, holey ultrathin g-C₃N₄ nanosheets (HCN NSs) with rich active sites are prepared, followed by the growth of 1T-MoS₂ NSs on their surfaces to construct 2D/2D 1T-MoS₂/HCN heterostructure. Due to the high surface area and abundant hydrogen active sites of the hybrid, large and intimate 2D nanointerface between MoS₂ and HCN, hydrogen ion adsorption and charge separation/transport ability are greatly enhanced. As a result, 1T-MoS₂/HCN-4 with the optimal 1T-MoS₂ content of 8 wt% displays the highest H₂ production rate of 2724.2 μmol^?1 h^?1 g^?1 under simulated solar light illumination with apparent quantum efficiency of 8.1% (λ = 370 nm). Moreover, the 1T-MoS₂/HCN-4 hybrid manifests improved stability after a long-time test. This study opens the door to design highly-efficient g-C₃N₄ based 2D/2D heterostructures for photocatalytic H₂ production.