Abstract
Hydrogen energy is regarded as one of the candidates for renewable and green energy because of its high energy density and zero pollution. Two dimensional MXene-based heterostructures combine advantages and synergistic properties of the constituents, attracting great interest as a kind of low-cost hydrogen evolution catalyst. Herein, we present an in-situ sulfidation method to form a MoS2/Mo2TiC2Tx nanohybrid so as to circumvent adventitious oxidation in Mo2TiC2Tx MXenes. On this basis, MoNiS/Mo2TiC2Tx electrocatalyst is synthesized by vulcanizing the precursor MOF self-assembled with MoS2/Mo2TiC2Tx. Benefiting from the synergistic coupling of Mo2TiC2Tx MXene, Ni2S and MoS2, the hydrogen evolution reaction (HER) test on MoNiS/Mo2TiC2Tx catalyst in 1 M KOH solution shows a significant HER activity with a low overpotential (153 mV) to produce a current density of 10 mA cm−2 and small Tafel slope (92 mV·dec−1). In addition, the catalyst is highly stable for at least 12 h with no drastically reduced activity. This design has important guiding significance for the preparation of hydrogen evolution materials by constructing the strategy of two-dimensional MXene and transition metal sulfide heterojunction.
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