Electrical double-layer capacitance in room temperature ionic liquids: ion-size and specific adsorption effects.
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.
Lauw
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CSIRO Process Science and Engineering, Bayview Avenue, Clayton South, Victoria 3169, Australia.
Horne
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Rodopoulos
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Nelson
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A
Leermakers
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