Herein,tungsten disulfide(WS2)nanosheets were firstly prepared by ultrasonic stripping method.Subse-quently,the mixture of WS2 nanosheets and P powder were treated by the Ar plasma,obtaining P-doped defective WS2 nanosheets(P-D-WS2 NSs).The as-prepared P-D-WS2 NSs samples exhibited higher catalytic activity for hydro-gen evolution reaction(HER)than defective WS2 nanosheets and pure WS2 nanosheets,such as lower overpotential,smaller Tafel slope,and better durability.Density functional theory calculations showed that the P atoms and defec-tive structures in WS2 regulated the electronic environment around the materials,optimizing the energy barrier of H+adsorption and hydrogen formation kinetics performance,thus improving the HER electrocatalytic activity.
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