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 usually are fed from external sources (except our scanning potentiostats that have built- in voltage scanners).
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