Hello everyone,

I am doing research on carbon based electrodes for supercapacitance. I have successfully measured it to be around 250F/g in a three electrode system. I am having troubles trying to create a 2-electrode symmetric capacitor setup for further tests. I use EC-Lab software on a Biologic SP-300 system. I am getting around 2F/gm when I use the following setup attached today. The E vs t curve of GCPL indicqte eqch cycle to finish in qbout 0.3 seconds zhich doesn't seem logical to me. After certain recommendations in RG, I have changed the vertex potentials to 0-1.2 V using Eoc as reference. I would like to know if I should change any more parameters.

Next, I am bit confused regarding the holding time. When I increased the holding time (HT), the capacitance increased to a large amount. With 10sec HT, the capacitance was around 60F/g but the curve of E vs t was rectangular instead of the ideal triangular. With 30sec HT, the capacitance was around 140 F/g. Therefore, is it okay to have a holding time and how to optimize the holding time if at all. I have also not been able to find any major publication which report supercapacitor capacitance with a holding time. Also, I would like to know if I use a holding time, can I report that capacitance directly or do I need to divide it by a factor related to the holding time??

Thanks in advance.

Camille