is there any difference between chronopotentiometry & galvanostatic similarly what is the difference between chronoamperometry & potentistatic?
It's really a question of where you are and who you communicate with. Generally speaking physical/analytical electrochemists talking about a constant [held] current experiment will refer to a "chronopotentiometry" experiment. Corrosion echem researchers, doing the exact same experiment, will use the term "galvanostatic." Experimentally, you may find differences between the experiments in what is allowed (iR compensation, advanced hardware settings, different acquisition modes and timing) so it is worthwhile to be aware of what you are looking to do and what you want to get out of it.
Generally experiments labeled "galvanostatic" and "chronopotentiometry" are doing the same thing: a constant current for a period of time (or until some voltage threshold is reached), then a step to a [different] constant current for a [different] period of time. Note that most charge/discharge experiments (battery, capacitor) are again the same, but with different presentation and/or analysis.
If you're thinking of a single instrument that does chronopotentiometry or chronoamperometry, then the internal circuitry is usually switched so that the former uses galvanostatic control, and the latter uses potentiostatic mode.
Chronopotentiometry does not necessarily require/mean controlled current (galvanostat) if the open circuit voltage of a cell is monitored. There may be a similar case for chronoamperometry in some diode circuits if I recall correctly.
In a broader sense, neither chrono method implies any specific control, but from a practical point of view, recording the potential in potentiostatic mode or recording the current in galvanostatic mode only serves a diagnostic purpose.
Chronopotentiometry may be used not only in galvanostatic mode, but in many other potentiodynamic techniques
It's really a question of where you are and who you communicate with. Generally speaking physical/analytical electrochemists talking about a constant [held] current experiment will refer to a "chronopotentiometry" experiment. Corrosion echem researchers, doing the exact same experiment, will use the term "galvanostatic." Experimentally, you may find differences between the experiments in what is allowed (iR compensation, advanced hardware settings, different acquisition modes and timing) so it is worthwhile to be aware of what you are looking to do and what you want to get out of it.
Generally experiments labeled "galvanostatic" and "chronopotentiometry" are doing the same thing: a constant current for a period of time (or until some voltage threshold is reached), then a step to a [different] constant current for a [different] period of time. Note that most charge/discharge experiments (battery, capacitor) are again the same, but with different presentation and/or analysis.
Thanks to all
I wish to deposit conducting polymer film on ITO, how galvanostatic technique is different from chronopotentiometry technique?
Most likely? Not at all different. If you need a more precise answer you should contact the manufacturer of your potentiostat.
The experiments are functionally the same. The chronopot version has more options including prestep current, a voltage threshold for stopping early, allowing advanced pstat settings to be modified, and you can enable decimate for data acquisition to get high point density at the transition but still collect for longer time without creating a massive data set.
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