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How to understand three-electrode system?
Author: Corrtest Time:2017-05-16 22:31:27 views

3-electrode system
  The potentiostat measures and controls the voltage difference between a WE and a RE. Current flow between the WE and CE is measured. CS series Potentiostat works with three electrodes immersed in a conductive electrolyte. 
   Working Electrode(WE): a sample of the corroding metal being tested.
   Reference Electrode (RE): an electrode with a constant electrochemical potential.
   WE and RE constitute measuring circuit. There is no current flow on RE.
   Counter Electrode (CE): a current-carrying electrode that completes the cell circuit.
   WE and CE constitute polarization circuit. Current flows from WE to CE. 

2-electrode system
  There is no separate RE involved in the experiment in 2-electrode system. When using the CS potentiostat/galvanostat for 2-electrode system, the CE can be used as RE to provide reference potential. During the measurements, the user simply need to connect the RE&CE clamp to a same electrode.

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