Heterostructure engineering of MoS2/Mo2CTx nanoarray via molten salt synthesis for enhanced hydrogen evolution reaction

Two-dimensional layered transition metal carbides (MXenes), have huge potential advantage for applications in hydrogen evolution reaction (HER). However, the hindered hydrogen evolution at large current densities and the instability of MXenes during HER remains major challenges. Herein, we report the MoS 2 /Mo 2 CT x nanoarray with aerophobic structure via molten salt synthesis. In situ vertical distribution of MoS 2 nanoarray on the surface of Mo 2 CT x accelerates hydrogen gas release from the electrode, exhibiting significantly enhanced catalytic activity and stability to bare MoS 2 and Mo 2 CT x . The MoS 2 /Mo 2 CT x nanoarray possesses excellent stability at −100 mA/cm 2 for 100 h with only 3% overpotential increase. Our work provides guidance for developing high-stability MXene-based catalysts by virtue of in situ bonding between nanoarray and MXene.