Carbon-coated MoSe2/Mo2CTx (MXene) heterostructure for efficient hydrogen evolution

Herein, a mesh carbon-coated MoSe 2 /Mo 2 CT x hybrid material (MoSe 2 /Mo 2 CT x @C) is proposed as an effective catalyst for electrochemical hydrogen evolution reaction (HER). On one hand, the highly conductive Mo 2 CT x substrate enhanced charge transfer ability and effectively prevented the agglomeration of MoSe 2 nanosheets to expose abundant active sites. On the other hand, the carbon coating layer further improved the conductivity and effectively prevented Mo 2 CT x from being oxidized in the environment. Consequently, the unique MoSe 2 /Mo 2 CT x @C hybrid material exhibited excellent HER performance. Specifically, the MoSe 2 /Mo 2 CT x @C catalyst only required an overpotential of 108.3 mV to reach a current density of 10 mA cm −2 and displayed excellent durability under long-term cycling in acidic solution. This research highlights the potential applications of MXene-based composite materials in the energy field.