Heterogeneous Nanostructure Based on 1T-Phase MoS2 for Enhanced Electrocatalytic Hydrogen Evolution
Heterogeneous Nanostructure Based on 1T-Phase MoS2 for Enhanced Electrocatalytic Hydrogen Evolution
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基于 1T 相 MoS2 的异质纳米结构增强电催化析氢
DOI：
10.1021/acsami.7b05775
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发表时间：
2017-08-02
影响因子：
9.5
通讯作者：
Li, Nan
中科院分区：
文献类型：
--
作者：
Liu, Zhipeng;Gao, Zhichao;Li, Nan
作为电催化剂，常规的2 H相MoS 2具有有限的活性位点和固有的低电导率。从2 H到IT的相变已被提出作为优化催化活性的有效策略。然而，通常涉及复杂的化学剥落。在此，通过简单的水热方法制备具有原位生成的IT相（1 T/2 H-MoS 2）的MoS 2非均相纳米片。局部引入的1 T相MoS 2不仅能提供更多的活性位，而且能显著提高电子电导率。由于这种独特的结构，合成的1 T/2 H-MoS 2纳米片表现出显着的析氢反应性能，在10 mA/cm（2）下具有220 mV的小过电位，61 mV/decade的小Tafel斜率和稳健的稳定性。这项工作促进了二维异质纳米结构的开发，并增强了应用。
As an electrocatalyst, conventional 2H-phase MoS2 suffers from limited active sites and inherently low electroconductivity. Phase transitions from 2H to IT have been proposed as an effective strategy for optimization of the catalytic activity. However, complicated chemical exfoliation is generally involved. Here, MoS2 heterogeneous-phase nanosheets with a IT phase (1T/2H-MoS2) generated in situ were prepared through a facile hydrothermal method. The locally introduced 1T-phase MoS2 can not only contribute more active sites but also markedly promote the electronic conductivity. Because of this unique structure, the as-synthesized 1T/2H-MoS2 nanosheets exhibit remarkable performance for the hydrogen evolution reaction with a small overpotential of 220 mV at 10 mA/cm(2), a small Tafel slope of 61 mV/decade, and robust stability. This work facilitates the development of a two-dimensional heterogeneous nanostructure with enhanced applications.