双金属片
过电位
电催化剂
塔菲尔方程
硫化
硫化物
MXenes公司
无机化学
化学
化学工程
材料科学
催化作用
纳米技术
冶金
电化学
物理化学
电极
有机化学
工程类
作者
Fengmei Zhang,Wenxin Zhang,Zhang Jin-mei,Yingxue Li,Yaling Wang,Liying Yang,Shougen Yin
标识
DOI:10.1016/j.jallcom.2022.167974
摘要
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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