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Exploiting efficient and low-cost cocatalyst with a facile grafting strategy is of critical importance for significantly boosting the photocatalytic H2-evolution activity.In this study,S2-adsorbed MoSx nanopar-ticle as a superior H2-evolutoin cocatalyst was successfully grafted on the TiO2 surface to greatly boost its photocatalytic activity via one-step lactic acid-induced synthesis strategy.Herein,the lactic acid can induce the homogeneous production of amorphous MoSx (a-MoSx) nanoparticles from MoS42-precursor,while the symbiotic S2-ions can be easily and availably self-adsorbed on the a-MoSx surface,resulting in the formation ofS2-adsorbed a-MoSx nanoparticles with a small size 0f0.5-3 nm.Photocatalytic results manifested that the S2-adsorbed MoSx nanoparticles could dramatically facilitate the H2-generation rate of TiO2 photocatalysts (3452 μmol h-1 g-1,AQE =16.5 ％).In situ irradiated XPS in conjunction with transient-state PL and photoelectrochemical tests reveal that the improved H2-generation activity can be ascribed to the synergistic effect of boosted interfacial charge transfer from TiO2 to S2-adsorbed MoSx and the superior H2-evolution reaction on self-adsorbed S2-ions.In addition,the S2-adsorbed MoSx nanoparticles can also act as the general H2-generation cocatalyst to obviously promote the activity of other typical host photocatalysts such as g-C3N4 and CdS.This work provides an innovative approach to develop high-efficiency MoSx-based cocatalyst with boosted interfacial charge transfer toward highly efficient photocatalytic materials.