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4723955 
Journal Article 
Voltammetric determination of extreme standard Gibbs ion transfer energy 
Olaya, AJ; Mendez, MA; Cortes-Salazar, F; Girault, HH 
2010 
1 
Journal of Electroanalytical Chemistry and Interfacial Electrochemistry
ISSN: 0022-0728 
644 
1 
60-66 
WOS:000278477300010 
A voltammetric methodology to determine the standard Gibbs energy of transfer of highly hydrophobic and hydrophilic ions has been developed. The electrochemical cell used includes a water vertical bar 1,2-dichloroethane micro-interface supported on a microhole in a thin polymer film separating an electrolyte-free aqueous phase and an organic phase with an electrolyte at low concentrations. The limiting current and the half-wave potential of these organic ions were determined by fitting the initial part of the ion transfer wave. The methodology was validated using ions with known thermodynamic data, and applied to very hydrophobic and very hydrophilic ions that usually cannot be observed within the potential window. (C) 2010 Elsevier B.V. All rights reserved. 
Standard Gibbs energy of transfer; Standard transfer potential; Micro-interface; Microhole; Hydrophobic ions; Hydrophilic ions