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REF ELECTRODES > HIGH TEMP
 The
question of high temperature reference electrodes seems to come up
often and in a wide range of applications. Here are a
couple of extreme examples from the molten salt community.
Ag
/ AgCl - This is not your typical aqueous reference electrode, but
rather an "electrode of the first kind". It consists of
a silver wire immersed in molten silver chloride (ref
1)
! The potential is controlled by the Ag(I)/Ag couple. An asbestos
wick could be used to form a liquid junction between the AgCl and your
melt.
Zn
/ Zn(II) - This reference electrode was used (ref 2) in a molten salt
application in a ZnCl2, 2NaCl melt at 450�C. Molten
zinc, in contact with the ZnCl2 / 2NaCl melt was used as a
reference electrode. A tungsten wire was used as a connection to
the molten zinc. The potential is controlled by the Zn(II)/Zn(liq)
couple. Because the solvent/electrolyte makes up one half of the couple,
this reference electrode is not plagued by liquid junction potential
uncertainties!
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