Interfacial capacitance and ionic association at electrified liquid/liquid interfaces

Yufei Cheng, Vincent J. Cunnane, David J. Schiffrin, Lasse Murtomäki, Kyösti Kontturi

    Research output: Contribution to journalArticleScientificpeer-review

    77 Citations (Scopus)

    Abstract

    The capacitance of the interface of immiscible electrolytes has been measured for the Li+, Na+, K+, Rb+ and Cs+ chlorides in 1,2-dichloroethane and nitrobenzene. Evidence for ionic specific adsorption at the interface is presented. The nature of the specifically adsorbed charge is discussed in terms of the formation of interfacial ion pairs between the aqueous and the organic ions. The contribution of specific ionic adsorption to the interfacial capacitance is calculated on the basis of an ionic associated model using the Bjerrum theory of ion-pair formation. A mixed solvent region with varying penetration of the ion pairs into it, dependent on their ionic radii, best represents the structure of these interfaces.

    Original languageEnglish
    Pages (from-to)107-114
    Number of pages8
    JournalJournal of the Chemical Society, Faraday Transactions
    Volume87
    Issue number1
    DOIs
    Publication statusPublished - 1991
    MoE publication typeA1 Journal article-refereed

    Keywords

    • capacitance
    • ionic association

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