When response is measure on bare GCE its fine but when same GCE is coated with some material response is zero.
Note: the coated material is highly conducting, porous, forms uniform film on GCE.
Try impedance spectroscopy....may get some information !
What does it mean "electrochemical response becomes zero" ??
Current of the order of micro ampere?
It really depends on what your material is. As the previous responder commented: What do you mean by EC response being zero - you don't see expected ox/rd peaks in solution or you get zero amps being measured at all?
Even if the film is conducting and porous it may block ferricyanide or any other electrochemically active species from interacting at the surface.
Dear Pramod K Kalambate,
illustrate, please, your cell and the coating.
When impedance is performed the resistance becomes low compared to bare GCE, which is acceptable but when I use other methods such as CV, the response becomes zero (no peak at all).
When I use ferricyanide the response is good which is okay. But with my molecules peak disappears.
Dear Pramod K Kalambate,
your new impedance, that has a lower Z (compared to bare GCE), is not, always, "good" for you, if you (might) outbreak some new unwanted reaction(s). So, your newer CV is done with "no peak at all".
What is the (critical[1]) analytical[2] value of the Vdc, in your EIS(s) ?
1. The parameter value of the Vdc is critical. So, try a Vdc=OCV that is, commonly, very different (new OCV), upon coating[2].
2. Applying a Vdc far from the updated OCV (for coated GCE) might show a common feeling of a ("good" ?) lower Z, that is creating a commonplace confusion.
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