Self-Templated Growth of Vertically Aligned 2H-1T MoS2 for Efficient Electrocatalytic Hydrogen Evolution.
Self-Templated Growth of Vertically Aligned 2H-1T MoS2 for Efficient Electrocatalytic Hydrogen Evolution.
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DOI：
10.1021/acsami.6b11298
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发表时间：
2016-11
影响因子：
9.5
通讯作者：
Jing Yang;Kai Wang;Jixin Zhu;Chao Zhang;Tianxi Liu
中科院分区：
文献类型：
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作者：
Jing Yang;Kai Wang;Jixin Zhu;Chao Zhang;Tianxi Liu
二维过渡金属二硫化物(TMD)的半导体异质结为新型能源和电子器件中各种功能的集成和实现开辟了新的途径。然而，设计具有定制特性的基于TMD的同质结构仍然是具有挑战性的。在这里，我们展示了一种以液相剥离的2H-MoS2为自模板的垂直排列的1T-MoS2的溶液生长方法。独特的MoS2基同质结构不仅为电催化析氢反应(HER)在边缘和基面提供了更多暴露的活性中心，而且由于引入了高的堆积孔隙率而改善了传质。所合成的具有多种MoS2纳米结构的AlMoS2电催化剂具有优异的HER活性，在10 mA cm-2时的低电位为203 mV，小的Tafel斜率为60 mV dec-1，以及显著的循环稳定性。因此，这项工作提供了一条简单而有效的途径来创造具有令人兴奋的性能的史无前例的基于MoS_2的同质结构材料，特别是作为电化学析氢生产中廉价的铂催化剂的替代品。
Semiconductor heterostructures of two-dimensional (2D) transition metal disulfide (TMD) have opened up approaches toward the integration of each function and implementations in novel energy and electronic devices. However, engineering TMD-based homostructures with tailored properties is still challenging. Herein, we demonstrate a solution-processed growth of vertically aligned 1T-MoS2 using liquid-phase exfoliated 2H-MoS2 as self-templates. The unique MoS2-based homostructures not only provide more exposed active sites in the edge and basal plane for the electrocatalytic hydrogen evolution reaction (HER) but also improve the mass transfer due to the introduction of high packing porosity. The resultant all-MoS2 electrocatalysts with an integration of polymorphous MoS2 nanostructures exhibit a superior HER activity with a low potential of 203 mV at 10 mA cm-2, a small Tafel slope of 60 mV dec-1, and a remarkable cyclic stability. This work thus provides a simple and efficient route for the creation of unprecedented MoS2-based homostructured materials with exciting properties, especially as an inexpensive alternative to platinum catalysts in electrochemical hydrogen evolution production.