Elevated Temperature Application
When appropriately constructed, the silver chloride electrode can be used up to 300 °C. The standard potential (i.e., the potential when the chloride activity is 1 mol/kg) of the silver chloride electrode is a function of temperature as follows:
| Temperature | Potential E0 |
|---|---|
| °C | V versus SHE at the same temperature |
| 25 | 0.22233 |
| 60 | 0.1968 |
| 125 | 0.1330 |
| 150 | 0.1032 |
| 175 | 0.0708 |
| 200 | 0.0348 |
| 225 | -0.0051 |
| 250 | -0.054 |
| 275 | -0.090 |
Bard et al. give the following correlations for the standard potential of the silver chloride electrode as a function of temperature (where t is temperature in °C):
E0(V) = 0.23695 - 4.8564x10−4t - 3.4205x10−6t2 - 5.869 x 10−9t3 for 0 < t < 95 °C.
The same source also gives the fit to the high-temperature potential, which reproduces the data in the table above:
E0(V) = 0.23735 - 5.3783x10−4t - 2.3728x10−6t2 for 25 < t < 275 °C.
The extrapolation to 300 °C gives E0 of -0.138 V.
Farmer gives the following correlation for the potential of the silver chloride electrode with 0.1 mol/kg KCl solution, accounting for the activity of Cl- at the elevated temperature:
E0.1 mol/kg KCl(V) = 0.23735 - 5.3783x10−4t - 2.3728x10−6t2 + 2.2671x10−4(t+273) for 25 < t < 275 °C.
Read more about this topic: Silver Chloride Electrode
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