Počet záznamů: 1  

Temperature effect in the ion transfer kinetics at the micro-interface between two immiscible electrolyte solutions

  1. 1.
    SYSNO ASEP0447051
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevTemperature effect in the ion transfer kinetics at the micro-interface between two immiscible electrolyte solutions
    Tvůrce(i) Trojánek, Antonín (UFCH-W) RID
    Mareček, Vladimír (UFCH-W) RID
    Samec, Zdeněk (UFCH-W) RID, ORCID
    Zdroj.dok.Electrochimica acta. - : Elsevier - ISSN 0013-4686
    Roč. 180, OCT 2015 (2015), s. 366-372
    Poč.str.7 s.
    Jazyk dok.eng - angličtina
    Země vyd.GB - Velká Británie
    Klíč. slovaITIES ; thick-wall microcapillary ; impedance spectroscopy
    Vědní obor RIVCG - Elektrochemie
    CEPGA13-04630S GA ČR - Grantová agentura ČR
    Institucionální podporaUFCH-W - RVO:61388955
    UT WOS000363345100044
    EID SCOPUS84940737814
    DOI10.1016/j.electacta.2015.08.110
    AnotaceElectrochemical impedance spectroscopy (EIS) was used to investigate the kinetics of the tetraethylammonium (TEA+) ion transfer across the water/1,2-dichloroethane (DCE) interface supported at the tip of a thick-wall microcapillary at various temperatures. EIS measurements were carried out at the equilibrium Galvani potential difference, which was controlled by the partition of TEA+ present in both the aqueous and DCE phase. The apparent standard rate constant k0 of the TEA+ ion transfer and the diffusion coefficient Dw of TEA+ in the aqueous phase were determined at five temperature values in the range 15–35 °C. The values k0 = 0.47±0.12 at 20 °C and k0 = 0.52±0.17 cm s−1 at 25 °C agree well with those obtained by EIS and noise analysis under the same or similar experimental conditions in our previous studies. Comparable effects of temperature on k0 and Dw, as indicated by nearly equal slopes of the plots of log k0 and log Dw vs. the reciprocal absolute temperature, point to the absence of an energy barrier for the ion to overcome in the interfacial region. On the other hand, the experimental values of k0 are significantly smaller than the upper limit of k0 for the diffusion-type process (ca. 100 cm s−1). The deceleration of the ion motion in the interfacial region could be ascribed to the slow relaxation of the interface, the favorable deformation of which is likely to control the interfacial ion transfer. The effect of temperature on the capacitance of the electric double layer at the water/DCE interface was found to be negligible, in an agreement with the prediction based on the simple Verwey-Niessen model of the back-to-back space charge (diffuse) layers.
    PracovištěÚstav fyzikální chemie J.Heyrovského
    KontaktMichaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196
    Rok sběru2016
Počet záznamů: 1  

  Tyto stránky využívají soubory cookies, které usnadňují jejich prohlížení. Další informace o tom jak používáme cookies.