Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, P. R. China.
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, P. R. China.
ACS Appl Mater Interfaces. 2017 Aug 2;9(30):25291-25297. doi: 10.1021/acsami.7b05775. Epub 2017 Jul 20.
As an electrocatalyst, conventional 2H-phase MoS suffers from limited active sites and inherently low electroconductivity. Phase transitions from 2H to 1T have been proposed as an effective strategy for optimization of the catalytic activity. However, complicated chemical exfoliation is generally involved. Here, MoS heterogeneous-phase nanosheets with a 1T phase (1T/2H-MoS) generated in situ were prepared through a facile hydrothermal method. The locally introduced 1T-phase MoS can not only contribute more active sites but also markedly promote the electronic conductivity. Because of this unique structure, the as-synthesized 1T/2H-MoS nanosheets exhibit remarkable performance for the hydrogen evolution reaction with a small overpotential of 220 mV at 10 mA/cm, 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.
作为电催化剂，传统的 2H 相 MoS 存在活性位点有限和固有电导率低的问题。从 2H 相向 1T 相的转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离。在这里，通过简便的水热法制备了具有 1T 相（1T/2H-MoS）的 MoS 异质相纳米片。局部引入的 1T 相 MoS 不仅可以提供更多的活性位点，而且可以显著提高电子电导率。由于这种独特的结构，所合成的 1T/2H-MoS 纳米片在析氢反应中表现出优异的性能，在 10 mA/cm 时过电位仅为 220 mV，塔菲尔斜率小至 61 mV/decade，并且具有良好的稳定性。这项工作促进了具有增强应用的二维异质纳米结构的发展。
