I am building a capacitor using nanomaterial grown on a substrate. We are trying to figure out what our test fixture configuration should be when doing Cyclic Voltammetry on the cell. Our group would ideally like to use a two-electrode configuration, but we believe the potentiostat is only capable of doing three electrode measurements. Our goal is to get reliable and comparable results.
An article about standardizing the capacitance measurements called "Best practice methods for determining an electrode material’s performance for ultracapacitors" says that the three electrode setup is flawed:
In a symmetrical two-electrode cell, the potential differences applied to each electrode are equal to each other and are one-half of the values shown on the X-axis of the CV chart. Therefore, for a given potential range on the X-axis of the CV, the working electrode of a three-electrode cell has twice the potential range applied as is applied to the electrodes in a twoelectrode cell and this results in a doubling of the calculated capacitance...
The article goes on to listing a few other reasons not to use it. Given this limitation, and our desire to use a two electrode set up, is there a way to do a two-electrode setup on our machine? The setup would like the one below:
We have been told that we can create a two-electrode system by attaching both our counter and reference onto one plate, and the working onto the other, that we would essentially have a two electrode setup. Our concern is that this would only apply voltage to one electrode, and not the other.
Is our concern valid? Can someone clarify the mechanics here for us or explain how to achieve our desired setup?