info:eu-repo/semantics/article
Electrochemistry in supercritical trifluoromethane
Fecha
2000-09Registro en:
Goldfarb, Darío L; Corti, Horacio Roberto; Electrochemistry in supercritical trifluoromethane; Elsevier Science Inc; Electrochemistry Communications; 2; 9; 9-2000; 663-670
1388-2481
CONICET Digital
CONICET
Autor
Goldfarb, Darío L
Corti, Horacio Roberto
Resumen
The use of trifluoromethane (CHF3) as a solvent for electrochemical studies in supercritical conditions is analyzed. The dielectric and electrical conductivity of supercritical CHF3 was measured at 323.15 K at several densities. The solubility and electrical conductivity of tetrabutylammonium hexafluorophosphate (TBAPF6) and decamethylferrocenium hexafluorophosphate (Fe(Cp *)2PF6) in supercritical CHF3 were measured at 323.15 K as a function of density. It was found that, in spite of the high ion pair formation of the TBAPF6 in the supercritical solvent, this salt is a suitable supporting electrolyte, having a conductivity much higher than that reported for other electrolytes in low dielectric constant supercritical solvents. The limiting currents measured for decamethylferrocene (Fe(Cp *)2) and decamethylferrocenium hexafluorophosphate (Fe(Cp *)2PF6) at a platinum microdisc in supercritical CHF3 at several densities and 323.15 K, show the feasibility of using the proposed supercritical system as a model for electrochemical studies in variable density media. The effect of concentration of the supporting electrolyte on the limiting current at the microelectrode is qualitatively discussed in terms of a recent theory which takes into account the ion association of the supporting and electroactive electrolytes.