Phase Engineering of W-Doped MoS 2 by Magneto-Hydrothermal Synthesis for Hydrogen Evolution Reaction.

Molybdenum disulfide (MoS 2 ) has been proved as an excellent potential hydrogen evolution reaction (HER) catalyst. Compared with thermodynamically stable 2H-MoS 2 , 1T-MoS 2 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 MoS 2 with high concentration 1T phase through magnetic free energy synergistic microstrain induced by W doping under low magnetic field. The 1T phase proportion in MoS 2 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 MoS 2 with high 1T concentration and high stability.