Dual-phase MoS2/MXene/CNT ternary nanohybrids for efficient electrocatalytic hydrogen evolution
Dual-phase MoS2/MXene/CNT ternary nanohybrids for efficient electrocatalytic hydrogen evolution
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DOI：
10.1038/s41699-022-00300-0
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发表时间：
2022-04
影响因子：
9.7
通讯作者：
Sichen Wei;Yu Fu;Maomao Liu;Hong-Fei Yue;Sehwan Park;Young Hee Lee;Huamin Li;Fei Yao
中科院分区：
文献类型：
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作者：
Sichen Wei;Yu Fu;Maomao Liu;Hong-Fei Yue;Sehwan Park;Young Hee Lee;Huamin Li;Fei Yao
二维二硫化钼（2D MoS 2）被认为是电化学析氢反应（HER）中铂（Pt）的潜在替代物。然而，MoS 2的广泛采用受到其有限数量的活性位点和低固有电导率的阻碍。在这项工作中，我们采用了一步溶剂热合成技术来构建由双相MoS 2，碳化钛（Ti 3C 2）MXene和碳纳米管（CNT）组成的三元混合结构，并表现出活性位点暴露，表面积扩大和导电性改善的催化剂的协同效应。双相MoS 2（DP-MoS 2）直接在MXene上形成，CNT充当2D岛之间的交联。边缘富集金属相MoS 2的存在，MXene的导电骨架沿着CNT的交联功能，明显改善了三元纳米复合材料的整体HER性能。此外，MoS 2与MXene的整合不仅增加了2D层的层间距离，而且部分抑制了MXene氧化和2D层的重新堆叠，从而导致良好的催化稳定性。结果，成功实现了169 mV的过电位和51 mV/dec的低Tafel斜率。这项工作为基于2D的电催化剂工程铺平了道路，并为下一代无贵金属HER电催化剂的开发提供了线索。
Two-dimensional (2D) molybdenum disulfide (MoS2) has been recognized as a potential substitution of platinum (Pt) for electrochemical hydrogen evolution reaction (HER). However, the broad adoption of MoS2is hindered by its limited number of active sites and low inherent electrical conductivity. In this work, we employed a one-step solvothermal synthesis technique to construct a ternary hybrid structure consisting of dual-phase MoS2,titanium carbide (Ti3C2) MXene, and carbon nanotubes (CNTs), and demonstrated synergistic effects for active site exposure, surface area enlargement, and electrical conductivity improvement of the catalyst. The dual-phase MoS2(DP-MoS2) is directly formed on the MXene with CNTs acting as crosslinks between 2D islands. The existence of edge-enriched metallic phase MoS2, the conductive backbone of MXene along with the crosslink function of CNTs clearly improves the overall HER performance of the ternary nanocomposite. Moreover, the integration of MoS2with MXene not only increases the interlayer distance of the 2D layers but also partially suppresses the MXene oxidation and the 2D layer restacking, leading to good catalytic stability. As a result, an overpotential of 169 mV and a low Tafel slope of 51 mV/dec was successfully achieved. This work paves a way for 2D-based electrocatalyst engineering and sheds light on the development of the next-generation noble metal-free HER electrocatalysts.