Engineering MoS2 nanomesh with holes and lattice defects for highly active hydrogen evolution reaction

Abstract Molybdenum disulfide (MoS 2 ) presents a promising catalyst to replace state-of the-art platinum (Pt) for hydrogen evolution reaction (HER), but it still lacks an effective way due to the catalytically inert basal plane. Herein, we report a rational design of MoS 2 nanomesh that possesses evenly distributed holes and defects to make full use of the 2H-MoS 2 basal planes by combining ball-milling with ultrasonic methods. The exfoliation of muti-layer MoS 2 to fewer layer or enven monolayer is proceed in pure water without using any chemicals or surfactants. The great advantage of the catalyst is the monolayer, holey and defective structure, which maximizing the synergistic activity for both electrocatalytic and photocatalytic HER performances. Impressively, the MoS 2 nanomesh renders outstanding electrocatalytic HER activity with an overpotential of 160 mV at a current density of 10 mV cm −2 , and a small Tafel slope of 46 mV decade −1 . The photocatalytic H 2 evolution rate is about 4.84 mmol h −1 when working with Eosin Y as an organic photosensitizer. Additionally, this catalyst shows excellent cycle stability in the electrochemical and photocatalytic reactions. This present work put a new insight into the large-scale production of chemically active 2H MoS 2 -based catalysts for HER.