Advantage of three electrode system over two electrode system
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to study the behavior of analyte at the electrode/electrolyte interface we require both potential and current to be monitored. Take analyte/electrolyte and put a electrode, and if I want to study the behaviour of analyte at this electrode (WE), we need to perturb the system, i.e. take away the system from its equilibrium. This can be done by polarizing the electrode either cathodically or anodically by simply applying potential or current to the WE. In order to apply potential, we require some standard/reference electrode, whose potential is almost constant. After the perturbation, we have to record the effect of perturbation, to do this we have to record the current that developed across WE and some other electrode (generally two leads require to complete the current circuit)...
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