Direct growth of high-content 1T phase MoS2 film by pulsed laser deposition for hydrogen evolution reaction

The modified MoS 2 -based material, with a higher conductivity and rich active sites, is promising one of a variety of nonprecious-metal electrocatalysts for hydrogen evolution reaction (HER). Here, the bulk MoS 2 is exfoliated to form small-size MoS 2 clusters by pulse laser, which are diluted in solid sulfur and further to form porous film. The 1T phase MoS 2 ratio in the prepared film was modulated by adding the different content of sulfur into MoS 2 target. Besides, this addition also has an effect on the pore structure of films. Finally, the obtained high-content 1T phase MoS 2 film provides the highly metallic conductivity and more active sites, which results in the more enhanced HER catalytic activity with a lower Tafel slope of 38 mV dec −1 , a smaller overpotential of 151 mV at 10 mA cm −2 , compared with the pure MoS 2 film.