Exfoliation of the defect-rich MoS 2 nanosheets to obtain nanodots modified MoS 2 thin nanosheets for electrocatalytic hydrogen evolution

Molybdenum disulfide (MoS 2 ) is a promising catalyst of hydrogen evolution reaction (HER). But the low density and poor reactivity of active sites, poor electrical transport to the catalyst, leads to the modest performance. In this work, we overcome these issues through as-preparing heterodimensional nanostructures of nanodots modified MoS 2 thin nanosheets (NDs-MoS 2 ), obtained by ultrasonic exfoliation of a defected MoS 2 nanosheets (D-MoS 2 ). Our results suggest that ultrasonic exfoliation of D-MoS 2 is a sample and efficient method of the synthesis NDs-MoS 2 to improve the catalytic activity of MoS 2 nanosheets. NDs-MoS 2 show the high HER performance with a small Tafel slope of 57 mV dec −1 and a low overpotential value (172 mV, at the current density of 10 mA cm −2 ), moreover, NDs-MoS 2 maintain the characteristic of MoS 2 long-term stability.