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Hysteresis in the MD Simulations of Differential Capacitance at the Ionic Liquid–Au Interface
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-11-30 , DOI: 10.1021/acs.jpclett.0c03212
Iuliia V. Voroshylova 1 , Heigo Ers 2 , Borja Docampo-Álvarez 2 , Piret Pikma 2 , Vladislav B. Ivaništšev 2 , M. Natália D.S. Cordeiro 1
Affiliation  

In this Letter, we report the first observation of the capacitance–potential hysteresis at the ionic liquid | electrode interface in atomistic molecular dynamics simulations. While modeling the differential capacitance dependence on the potential scan direction, we detected two long-living types of interfacial structure for the BMImPF6 ionic liquid at specific charge densities of the gold Au(111) surface. These structures differ in how counterions overscreen the surface charge. The high barrier for the transition from one structure to another slows down the interfacial restructuring process and leads to the marked capacitance–potential hysteresis.

中文翻译:

离子液体-Au界面处微分电容的MD模拟中的磁滞

在这封信中,我们报告了对离子液体|的电势-磁滞现象的首次观察。原子分子动力学模拟中的电极界面。在对差分电容对电位扫描方向的依赖性进行建模时,我们在金Au(111)表面的特定电荷密度下检测到BMImPF 6离子液体的两种长寿命界面结构。这些结构的不同之处在于抗衡离子过筛表面电荷的方式。从一种结构过渡到另一种结构的高障碍会减慢界面重组过程,并导致明显的电容-电位滞后现象。
更新日期:2020-12-17
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