Browsing by Author "Leermakers, FAM"

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    Electrical double-layer capacitance in room temperature ionic liquids: ion-size and specific adsorption effects
    (American Chemical Society, 2010-09-02) Lauw, Y; Horne, MD; Rodopoulos, T; Nelson, A; Leermakers, FAM
    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. © 2010, American Chemical Society
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    Room-temperature ionic liquids: excluded volume and ion polarizability effects in the electrical double-layer structure and capacitance
    (The American Physical Society, 2009-09-10) Lauw, Y; Horne, MD; Rodopoulos, T; Leermakers, FAM
    We study structures of room-temperature ionic liquids at electrified interfaces and the corresponding electrical double-layer capacities using a self-consistent mean-field theory. Ionic liquids are modeled as segmented dendrimers and the effective dielectric constant is calculated from the local distribution of ions to accommodate the excluded volume and the local dielectric screening effects. The resulting camel-shaped capacitance curve is further analyzed in terms of the thickness of alternating layers and the polarization of ions at electrified interfaces. © 2009 The American Physical Society.