Nitrogen-Doped MoS₂/Ti₃C₂T Heterostructures as Ultra-Efficient Alkaline HER Electrocatalysts

Molybdenum disulfide (MoS₂) is intrinsically inert for the hydrogen evolution reaction (HER) in alkaline media due to its electronic structures. Herein, we tune the electronic structures of MoS₂ by a combined strategy of post-N doping coupled with the synergistic effect of Ti₃C₂T. The as-prepared N-doped MoS₂/Ti₃C₂T heterostructures show remarkable alkaline HER activity with an overpotential of 225 mV at 140 mA cm^-2, which ranks the N-doped MoS₂/Ti₃C₂T heterostructures among the best MoS₂/MXene-based electrocatalysts reported for alkaline HER. The first-principles calculations indicate that the N doping can enhance the activation of nearby S sites of MoS₂/Ti₃C₂T and thus promote the HER process. This strategy provides a promising way to develop high-efficiency MoS₂/MXene heterostructure catalysts for alkaline HER.