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

Abstract 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.