Defect-Assisted Anchoring of Pt Single Atoms on MoS Nanosheets Produces High-Performance Catalyst for Industrial Hydrogen Evolution Reaction.

Pt-based catalysts are currently the most efficient electrocatalysts for the hydrogen evolution reaction (HER), but the scarcity and high cost of Pt limit industrial applications. Downsizing Pt nanoparticles (NPs) to single atoms (SAs) can expose more active sites and increase atomic utilization, thus decreasing the cost. Here, a solar-irradiation strategy is used to prepare hybrid SA-Pt/MoS nanosheets (NSs) that demonstrate excellent HER activity (the overpotential at a current density of 10 mA cm (η ) of 44 mV, and Tafel slope of 34.83 mV dec in acidic media; η of 123 mV, and Tafel slope of 76.71 mV dec in alkaline media). Defects and deformations introduced by thermal pretreatment of the hydrothermal MoS NSs promote anchoring and stability of Pt SAs. The fabrication of Pt SAs and NPs is easily controlled using different Pt-precursor concentrations. Moreover, SA-Pt/MoS produced under natural sunlight exhibits high HER performance (η of 55 mV, and Tafel slope of 43.54 mV dec ), which indicates its viability for mass production. Theoretical simulations show that Pt improves the absorption of H atoms and the charge-transfer kinetics of MoS , which significantly enhance HER activity. A simple, inexpensive strategy for preparing SA-Pt/MoS hybrid catalysts for industrial HER is provided.