arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.00378cond-mat.soft
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带电电极上偶极阳离子双组分电解质溶液的理论和计算机模拟

Two-component electrolyte solutions with dipolar cations on a charged electrode: Theory and computer simulations

Yu. A. Budkov, A. V. Sergeev, S. V. Zavarzin, A. L. Kolesnikov

摘要:

用于能量转换和储存的先进电化学装置的开发需要对电极反应进行微调,这可以通过改变电极/溶液界面结构来实现。特别地,在碱金属盐电解质的情况下,双电层(EDL)组成可以通过引入可以具有极性片段的有机阳离子(例如室温离子液体阳离子)来管理。为了探索这种方法,我们开发了一个理论模型,预测简单的(碱)阳离子与偶极(有机)的EDL内的有效替换。对于分子偶极矩($2-4~D$)的典型值,该效应在表面电荷密度高于30 $μC/cm^2$时表现出来。我们表明,该系统的预测行为与分子动力学模拟的结果定性一致。

英文摘要:

The development of advanced electrochemical devices for energy conversion and storage requires fine tuning of electrode reactions, which can be accomplished by altering the electrode/solution interface structure. Particularly, in case of an alkali-salt electrolyte the electric double layer (EDL) composition can be managed by introducing organic cations (e.g. room temperature ionic liquid cations) that may possess polar fragments. To explore this approach, we develop a theoretical model predicting the efficient replacement of simple (alkali) cations with dipolar (organic) ones within the EDL. For the typical values of the molecular dipole moment ($2-4~D$) the effect manifests itself at the surface charge densities higher than 30 $μC/cm^2$. We show that the predicted behavior of the system is in qualitative agreement with the molecular dynamics simulation results.

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