Dear Omar,

I am not sure your question is clear enough. Could you please elaborate your question in detail? For example: 1) what is your bifunctional electrode and for what purpose? 2) what is the potential window you need? What does mean "a disponible substrate" (do you mean disposible substrate)?  I might give you some suggestions, if you clarify these issues.  

Thanks Professor Qijin Chi

My bifunctionnal electrod is a glassy carbon , with a powder of perovskite(ABO3) on it , fixed by a polymer diluted in an organic solvent  .

this electrod has been to characterized using electrochemical  cell in a range of potentiel 0-0.65 v, after, we extract his cyclic voltametry , chrono ampérometry,..........

in the aim to identify the effect ( electrochemical evolution) of strontium substitution in site A of perovskite ( LaFe0.7Ni0.3O3)

In this case, i have not glassy carbon to prepare my electrod , i ask by what can i replace it ???

Hi, Omar,

It is very nice that you have clearly explained your question. Thanks. The potential window you need is only in the range 0-0.65 V  (which reference electrode you used?), I think Pt or Au metal electrode could be the best. You could also use ITO or Si.

Good luck with your research.

Thanks Professor Qijin , my reference electrod is the electrod of Hg

Can a peace of Nickel or copper be used ??? 

Sorry for the probably inadequate question, but what is the difference between the vitral carbon and the spare carbon brushes for hand power tools? For simple preliminary measurements I have used even graphite powder from pencil mixed with paraphine, which for high resistance (few k and above) solid samples turned to be quite useful.

Thanks  freind Gergo, no problem and you are welcome in this fruitual discussion , 

I think that using powder of graphite carbon for this kind of tests improve so much the conductivity of your electrod but i think either that vitral carbon can used as solid and inerte support to elaborate this electrod

if you use powder of graphit carbon, on what support (substratum) can you deposit it ?

I actually used the graphite powder-parafine mixture as intermediate electrode because the copper plates did not provide good contact with the solid sample.

I think you can use any metal or other conducting substrate to apply graphite powder-polymer mixture, but I suggest using copper, because you will have copper wires to connect the sample electrodes to the measuring device. Same technique, used for the perovskite-polymer layer formation, can be used. For the potential the data should be the same, but for the amperometry it probably will be changed a lot, because the conductivity of the powdered electrode is much lower.

I have seen colleagues dip copper wire in polymer-chalcogenide glass mixture and then use the dried product as electrode. As far as I remember, the diped wire electrodes worked better than the applied on top of plate because of the sedimentation.

I tried using graphite plate+graphite powder for solid samples, but it turned out that the powder+copper plate is easter to handle, because it is easy to soldier the wires.

Pencil graphite has polymer additives to make it softer, this is why I askedabout the graphite brushes for power tools. They look almost the same as the graphite substrates that I used for vacuum thermal evaporation and that were from lab grade graphite.

Thank you, Freind Gergo