超晶格
过电位
塔菲尔方程
材料科学
堆积
基质(水族馆)
云纹
光电子学
纳米技术
电化学
电极
光学
化学
物理化学
物理
海洋学
地质学
有机化学
作者
Zhenzhen Jiang,Wenda Zhou,Aijun Hong,Manman Guo,Xingfang Luo,Cailei Yuan
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2019-10-30
卷期号:4 (12): 2830-2835
被引量:98
标识
DOI:10.1021/acsenergylett.9b02023
摘要
A MoS2 moiré superlattice with a twisted angle of θ ≈ 7.3° via a facile method instead of a conventional mechanical stacking method is successfully fabricated. With reduced interlayer potential barriers demonstrated by first-principles calculations and ultralow frequency Raman spectra, electrons can transfer easily from a conductive substrate to active sites in this MoS2 superlattice, thus leading to good hydrogen evolution reaction (HER) activities. By using an electrochemical microcell technique, improved catalytic performance in the MoS2 moiré superlattice is validated, with a current density of −10 mA/cm2 at an overpotential of −153 mV and a Tafel slope of 73 mV/dec. A strategy to boost the electrocatalytic performance by reducing the interlayer potential barriers is successfully achieved by employing a MoS2 moiré superlattice. The work paves a new pathway to break the bottleneck for further improvement of HER performance and also opens interesting possibilities for implementing moiré superlattices in catalysis, energy storage, and 2D functional devices.
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