One‐Pot, Facile, and Versatile Synthesis of Monolayer MoS 2 /WS 2 Quantum Dots as Bioimaging Probes and Efficient Electrocatalysts for Hydrogen Evolution Reaction

In this work, uniform molybdenum disulfide (MoS 2 )/tungsten disulfide (WS 2 ) quantum dots are synthesized by the combination of sonication and solvothermal treatment of bulk MoS 2 /WS 2 at a mild temperature. The resulting products possess monolayer thickness with an average size about 3 nm. The highly exfoliated and defect‐rich structure renders these quantum dots plentiful active sites for the catalysis of hydrogen evolution reaction (HER). The MoS 2 quantum dots exhibit a small HER overpotential of ≈120 mV and long‐term durability. Moreover, the strong fluorescence, good cell permeability, and low cytotoxicity make them promising and biocompatible probes for in vitro imaging. In addition, this work may…

• NS
  National Science Foundation
• NK
  National Key Research and Development Program of China