Design and Epitaxial Growth of MoSe2–NiSe Vertical Heteronanostructures with Electronic Modulation for Enhanced Hydrogen Evolution Reaction

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• 作者：Xiaoli Zhou ; Yun Liu ; Huanxin Ju ; Bicai Pan ; Junfa Zhu ; Tao Ding ; Chunde Wang ; Qing Yang
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：March 22, 2016
• 年：2016
• 卷：28
• 期：6
• 页码：1838-1846
• 全文大小：588K
• ISSN：1520-5002

文摘

Transition metal dichalcogenides (MX₂, where M = Mo or W and X = S or Se) have been regarded as some of the best alternatives for noble metal-free electrocatalysts for the hydrogen evolution reaction (HER). A tremendous number of attempts have mainly focused on the maximization of the number of active edge sites and the conductivity of MX₂-based electrocatalysts to enhance HER performance. However, for MX₂-based electrocatalysts, the acceleration of the kinetic process to improve HER performance has been neglected until now. Here we report a colloidal epitaxial growth strategy for synthesizing MoSe₂–NiSe nanohybrids with well-defined heterointerfaces that are constructed by in situ growth of metallic NiSe nanocrystallites on the MoSe₂ nanosheets. These high-quality vertical heteronanostructures with band alignment give rise to the electrons being transferred from the metallic NiSe nanocrystallites to the MoSe₂ matrix, achieving the electronic modulation of the MoSe₂–NiSe nanohybrids for efficient electrocatalytic activity. The MoSe₂–NiSe nanohybrids exhibit excellent HER catalytic properties with a low onset potential of −150 mV, a large cathodic current density (10 mA cm^–2 at an overpotential of 210 mV), and a small Tafel slope of 56 mV per decade. The greatly enhanced electrocatalytic properties were attributed to the electronic structure modulation from the synergetic interactions between NiSe nanocrystallites and MoSe₂ nanosheets. We anticipate that the construction of hybrid structures will be a powerful tool for creating high-performance electrocatalysts in solids.