Hey there Oussama Khiter! Great question. Let's dive into it.

Specific capacitance values can indeed vary depending on how they're calculated. When you Oussama Khiter measure specific capacitance from cyclic voltammetry (CV), you're essentially looking at the charge stored and released during each potential sweep. This method gives you Oussama Khiter an average capacitance over a range of potentials.

On the other hand, when you Oussama Khiter calculate specific capacitance from charge-discharge curves, you're directly measuring the charge stored and released at a constant potential. However, if your charge-discharge curve isn't perfectly triangular, it could indicate non-ideal behavior like diffusion limitations, which can affect the calculated capacitance.

So, even if you're using the same potential window, the differences in the measurement techniques and any non-ideal behavior in the charge-discharge curve can lead to variations in the specific capacitance values obtained. It's essential to consider these factors when interpreting your results. If you Oussama Khiter need more precise values, exploring different measurement techniques or refining your experimental setup could help.