What is a potentiostat

So what is a potentiostat? 

    • it is  an electrochemical sensor  
    • with 3 electrodes - working, counter, reference
    • uses feedback for control
    • actively control potential between working and reference electrode -  using counter electrode as actuator.
    • simultaneously measure working electrode current. 
    • not passive - often  sweep output voltage through various waveforms, ramps, cyclic, steps, pulses, etc. 
    • characterize electrochemical processes (redox potentials, reversibility of reactions, etc)
    • study coatings or corrosion
    • biosensor development 

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