Electrical Double-Layer Capacitance in Room Temperature Ionic Liquids: Ion-Size and Specific Adsorption Effects

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• 作者：Y. Lauw ; M. D. Horne ; T. Rodopoulos ; A. Nelson ; F. A. M. Leermakers
• 刊名：Journal of Physical Chemistry B
• 出版年：2010
• 出版时间：September 2, 2010
• 年：2010
• 卷：114
• 期：34
• 页码：11149-11154
• 全文大小：212K
• 年卷期：v.114,no.34(September 2, 2010)
• ISSN：1520-5207

文摘

The electrical double-layer structure and capacitance in room temperature ionic liquids at electrified interfaces were systematically studied with use of the self-consistent mean-field theory. The capacitance curve departs from symmetry with respect to the point of zero charge when unequal ion-size is implemented or when specific adsorption of ions is introduced. For the case of unequal ion-size, the shape of the capacitance curve is strongly determined by the size of the counterion and only weakly influenced by the co-ion size. When present, specifically adsorbed ions would change the capacitance within a limited range of applied potential from the point of zero charge, which itself varies with the strength of specific adsorption.