Abstract：
:Understanding the structure and properties at the electrolyte-electrode interface is vital for the rational design of the supercapacitors or other electrochemical devices. In this work, we explored the influence of interlayer spacing of the MoS2 electrode on the interfacial structure and electrical properties of sodium-ionic liquids (ILs) electrolytes via performing the all-atom molecular dynamics simulations. From the number density, charge density, and electrical potential distribution near the surface, the Mo- and S-terminal edges possess positive and negative features when the interlayer spacing is less than 8.5 Å. Meanwhile, the strength of the first density layer of ILs increases with the increase of the interlayer spacing of MoS2 for both Mo- and S- terminal surfaces in the neutral or charging state. Furthermore, the coordination number of sodium ion at the electrode surface was analyzed, and it was shown that the S-terminal surface has a larger coordination number than that on the Mo-terminal surface. Interestingly, the coordination number of MoS2 with the interlayer spacing of 8.0 Å is the lowest in the ranges of 6.5~8.5 Å. The electrolyte's charge screening factor also reflects the opposite electrical state of Mo- and S-terminal surfaces and weakens with increasing the interlayer spacing and surface charge density. The obtained understanding of ILs at electrode interfaces with different layer spacings in this work will provide insight into the molecular mechanisms of ILs-based sodium supercapacitors or other electrochemical devices in critical chemical engineering processes.
journal_name
J Mol Modeljournal_title
Journal of molecular modelingauthors
Wang M,Wang Y,Li M,Wang S,He Hdoi
10.1007/s00894-020-04644-6subject
Has Abstractpub_date
2021-01-18 00:00:00pages
41issue
2eissn
1610-2940issn
0948-5023pii
10.1007/s00894-020-04644-6journal_volume
27pub_type
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