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[Marsing]

profitis,
sorry, i come from zero.
what is electrolyte consist of ? also what are those rectangle ?

[profitis]

no problem @marsing.rectangles are platinum foils at different depths in any electrolyte that doesnt react with platinum e.g. H2SO4 aq. NaOH aq.(NH4)2SO4 aq. The last 2 electrolytes very good becoz they wet electrodes,low surface tension.

[MarkE]

you have permission to try it yourself mark E. You are correct,gas pumps auto-electrochemicaly down each electrode to respective depths spontaneously during open circuit off mode however respective concentrations of gas are still different.it was the smart poster lanca IV who mentioned this earlier in this thread.

Profitis, I would appreciate a reference if you can provide one.

[profitis]

im going to have to hunt for one mark E. But dont you think that the o2 potential on the anode is diluted by the larger surface area of submerged electrode surface and the potential more concentrated on the cathode with less area for charge distribution?

[MarkE]

im going to have to hunt for one mark E. But dont you think that the o2 potential on the anode is diluted by the larger surface area of submerged electrode surface and the potential more concentrated on the cathode with less area for charge distribution?

Profitis what I expect is that any difference in concentration is driven towards equilibrium regardless of whether the external circuit is connected or not.  I may be missing a consideration which is why I have asked for a reference that states that the drive towards equilibrium requires connection of the external circuit.