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potential coulometry, one can easily find the
number of electrons involved in the electrolytic
reaction. In order to carry out constant
potential electrolysis, the oxidation potential or
reduction potential of the substrate should be
measured in advance, but one can estimate the
applied potential at which rapid current
increase is observed from a current-potential
curve of the substrate. As shown in
Figure 3.6
, a
salt bridge terminated either by a Luggin
capillary or a plug of porous Vycor glass is
placed closed to the working electrode, and an
appropriate constant potential relative to a
reference electrode such as an aqueous SCE is
applied using a potentiostat. The amount of
electricity passed is measured by a coulometer.
Figure 3.5
Profile showing electrolysis time
during constant current electrolysis (a) and
constant potential electrolysis (b)
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