Fig. 1: Schematic of the
potentiostatic control loop. RE Reference electrode, WE working electrode,
CE counter electrode, CI control input
A control voltage is fed into the control input CI. This control voltage
forces a current through the counter electrode exactly as high as to achieve
the wanted potential difference between working electrode and reference
electrode. The control voltage may be produced by the internal potential
control source of the potentiostat, or by an external signal generator, e.g.
a ramp generator or a sine wave generator. While for a constant potential
the internal potential control source is sufficient, time-dependent signals
are to be fed from external sources (except our scanning potentiostats that
also have built- in voltage scanners).
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