An internal silver/silver chloride (0.1 M KCl) reference electrode was constructed and calibrated versus a hydrogen electrode under supercritical conditions. Solutions used for the calibration were 0.1 and 1.0 M HCl. An extrapolation method is discussed for calculating the mean ionic activity coefficients of HCl at elevated conditions. The standard potential of the reference electrode can be expressed as E° = 0.4597 - 0.0006087T (volts) for temperatures from 300 to 750 K and pressures from 200 to 280 atm.

Subject
Vapor pressure, Electrochemical cells, Correlation, Reactors, Hydrogen gas, Reference electrodes, Hydrogen electrodes, Ceramics, Potassium chloride, Electrodes, Electrode potential, Hydrogen, Standard electrode potential
Keywords:
calibration, electrochemical cell, equilibrium potential, hydrochloric acid, hydrogen, potentiostatic, pressure, reference electrode, standard electrode, supercritical
National Association of Corrosion Engineers
1991
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