Is there any effect on the supercapactive behavior if we use platinum foil instead of platinum electrode ? Is there any surface area effect behind this?
A platinum foil ensures a much larger surface compared to that of a wire electrode. That fullfils the condition that the working electrode (having a much smaller surface compared to that of the auxiliary electrode) becomes the current limiting electrode, i.e. the observed current flowing through the cell, depends on the electrode processes taking place on the working electrodes and not those taling place on the surface of the auxiliary electrode.
Dear Atika,
I agree with the two previous answers. Current flows between working and auxiliary electrodes, and a higher area (platinum foil) warranty there is no limitation to the current flow. On the other hand, if working electrode has a high area (and so the auxiliary), the capacitive current will be also higher.
I think the reason is to increase the surface area of the electrode
(But suppose if our working electrode has very large surface area. Mean to say sometimes large number of bubbles coming out of counter electrode, a kind of very fast reaction happens at counter electrode.Is this because that counter electrode area doesnt compensates that working electrode surface area ? I want to just ask that there is some relation between the working and counter surface area or nothing happens lyk that @Veera)
Bubbles come from the reaction that happens at the counter electrode (CE). If in the working electrode (WE) there is an oxidation, in the CE a reduction (just the opposite to allow the current flow and close the circuit). If in the WE a reduction happens, in the CE and oxidation occurs. Bubbles usually come from the reduction or oxidation of water (hydrogen or oxygen evolution) and obviously the highest the area the highest the electrolysis, but in any case if there is no other system to be reduced or oxidized first is going to occur.
Best,
Teresa
Dear Dr. Atika Sahota,
in general, the counter electrode is optimized by increasing its area and facilitating current flowing through the cell. Personally I use Pt electrodes in the form of a flat grid (for samples with the same geometry) and in the form of a cyclindrical grid (for samples of different shapes, eg tubes), which are visible in the attached photos. The results were excellent, both in tests of potentiodynamic polarization curves and in EIS measurements.
Best regards, Pierluigi Traverso
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