Abstract
Pressure-balanced external Ag/AgCl reference electrodes have been extensively used for corrosion monitoring in both pressurized water reactor and boiling water reactor environments. In order to prolong the electrode lifetime, pure water is often employed as the electrode filling solution. Characterization of the potential of the water-filled external Ag/AgCl reference electrode was performed by estimating a thermal liquid junction potential (TLJP) originating from the thermal diffusion of ionic species in the filling solution. The potential of the thermoelectrochemical cell, Ag/AgCl vs. that of the standard hydrogen electrode at temperature was expressed as the sum of the isothermal potentials and TLJP. The TLJP was analyzed for the Soret steady state based on irreversible thermodynamics by calculating the heat of transport after Agar et al’s theory and estimating the limiting ionic conductance from Quist et al’s work. Calculated potential of the water-filled external reference electrode was compared with experimental data, showing a qualitative agreement. © 2003 The Electrochemical Society. All rights reserved.
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