Phase Engineering of W-Doped MoS₂ by Magneto-Hydrothermal Synthesis for Hydrogen Evolution Reaction

Molybdenum disulfide (MoS₂ ) has been proved as an excellent potential hydrogen evolution reaction (HER) catalyst. Compared with thermodynamically stable 2H-MoS₂ , 1T-MoS₂ exhibits higher conductivity and catalytic activity, whereas it is usually difficult to prepare since of thermodynamically metastable. Herein, a feasible method is reported to fabricate ambient-stable MoS₂ with high concentration 1T phase through magnetic free energy synergistic microstrain induced by W doping under low magnetic field. The 1T phase proportion in MoS₂ can be as high as 80% and is ambient-stable for more than one year. The catalyst prepared under a magnetic field of 3 T delivers an overpotential of 195 mV at a current density of 10 mA cm^-2 and has a long-term stability over 50 h. This work provides a novel strategy for preparation of MoS₂ with high 1T concentration and high stability.