Naslov
A new access to Gibbs energies of transfer of ions accross liquid/liquid interfaces and new method to study electrochemical processes at well-defined three-phase junctions

Autori
Scholz, Fritz ; Komorsky-Lovrić, Šebojka ; Lovrić, Milivoj

Izvornik
Electrochemistry communications (1388-2481) 2 (2000), 2; 112-118

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
liquid/liquid interfaces; Gibbs energy of transfer; graphite electrode; ion transfer

Sažetak
Droplests of polar and nonpolar aprotic solvents containing dissolved electroactive species can be easily attached to paraffin-impregnated graphite electrodes. When the electrode with the attached droplet is introduced into an aqueous electrolyte solution, the electrochemical reactions of the dissolved species can be elegantly studied. Provided the droplet does not contain a dissolved electrolyte, the electrochemical reaction will be confined to the very edge of the three-phase junction droplet/graphite /aqueous electrolyte. When a neutral species is oxidised, two pathways are possible: the oxidised species can remain in the droplet and anions will be transffered from the aqueous solution to the organic solvent, or the oxidised species may leave the droplet and enter the aqueous solution. Depending on the nature of the dissolved species, the nature of the organic solvent, the presence or absence of appropriate anions and cations in the two liquid phases, very different reaction patways are possible. The new approach allows studies of ion transfer betwee immisible solvent to be performed with a three-electrode potentiostat. Electrochemical determinations of the Gibbs energy of ion transfer between aqueous and nonpolar liquids are possibble, whereas conventional ion transfer studies require the presence of dissociated electrolyte in the organic phase. The new method considerably widens the spectrum of accessible ions.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA