离子液体对1T / 2H二硫化钼进行相工程设计以增强电催化氢的释放,ChemElectroChem

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离子液体对1T / 2H二硫化钼进行相工程设计以增强电催化氢的释放
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-07-23 , DOI: 10.1002/celc.202000745
Xin Zhang ₁ , He Li ₁ , Hui Yang ₂ , Fei Xie ₁ , Zhihao Yuan ₁ , Lenka Zajickova ₃ , Wenjiang Li _{1,

2}

Affiliation

二维（2D）二硫化钼（MoS ₂）被认为是用于氢气释放反应（HER）的有吸引力的非贵金属电催化剂。设计MoS ₂的晶相以激活基面/边缘并同时提高电子电导率目前是提高其HER活性的有效策略。本文中，我们报告了一种简便有效的水热路线，以离子液体（溴化正丁基吡啶鎓[BPy] Br）为结构导向剂来制备1T / 2H-MoS ₂催化剂，其中[BPy]的位阻较大Br和相互的π堆积相互作用诱导MoS ₂的相变从2H到1T阶段。通过在反应系统中添加适量的[BPy] Br，1T / 2H-MoS _2中1T相的部分增加，这可以暴露其基面/边缘上更多的活性位点，并促进电荷转移。她。因此，1T / 2H-MOS ₂相比于所述MOS的91.9％的1T部分表现出显著增强HER活性₂而不[BPY] BR，借助于在59毫伏分解的下塔菲尔斜率方面合成^{- 1}。该合成策略为设计基于MoS ₂的电催化剂的相结构以实现高HER效率提供了有价值的指导。

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Phase‐Engineering of 1T/2H Molybdenum Disulfide by Using Ionic Liquid for Enhanced Electrocatalytic Hydrogen Evolution

Two‐dimensional (2D) molybdenum disulfide (MoS₂) has been regarded as an attractive non‐precious‐metal electrocatalyst for the hydrogen evolution reaction (HER). Engineering the crystal phase of MoS₂ to activate the basal planes/edges and simultaneously improve the electronic conductivity is currently an effective strategy for enhancing its HER activity. Herein, we report a facile and efficient hydrothermal route to prepare 1T/2H‐MoS₂ catalysts using ionic liquid (N‐butyl pyridinium bromide, [BPy]Br) as a structure‐directing agent, where the large steric hindrance of [BPy]Br and the mutual π‐stacking interaction induce the phase transition of MoS₂ from 2H to the 1T phase. By adding a suitable amount of [BPy]Br in the reaction system, the portion of the 1T phase in 1T/2H‐MoS₂ was increased, which can expose more active sites on its basal planes/edges as well as facilitate charge transfer for the HER. Consequently, 1T/2H‐MoS₂ with the 1T portion of 91.9 % exhibits a significantly enhanced HER activity compared to that of the MoS₂ synthesized without the aid of [BPy]Br, in terms of a lower Tafel slope of 59 mV dec⁻¹. This synthesis strategy provides valuable guidance for designing the phase structure of MoS₂‐based electrocatalysts to achieve high HER efficiency.

更新日期：2020-08-14

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