Electrochimica Acta, Vol.41, No.16, 2579-2585, 1996
A Reference Electrode for Use in Methanol Solutions
The choice of a suitable reference electrode for electrochemical testing of metals in organic solutions poses a major difficulty. The goal of this research was to develop a stable, reproducible and minimally contaminating reference electrode to be used while conducting electrochemical experiments in methanol solutions of varied compositions. The applicability of the Ag/AgCl(Methanol) electrode was investigated. Examination of the thermodynamic behavior of this electrode showed that the observed Nernst slope with respect to chloride concentration agreed well with theory. The equilibrium potential was also found to vary with water concentration, possibly due to changes in the energy needed to transfer a chloride ion from water to methanol and/or changes in the activity coefficient of chloride, The electrode interface was found to be moderately reversible, with an exchange current density of 3 x 10(-5) A/cm(2). Further, this electrode was observed to be stable and durable for over two years. The water leakage rate from the reference electrode was found to be quite low over the time periods of relevance for the electrochemical experiments.