Hello,

I am doing the supercapacitor with carbon/metal oxide composite.

The specific capacitances derived from GCD are showing in the Figure.

My question is why the specific capacitance drop so much with different current density?The capacitance at 2A/g is around half value of that at 1A/g.

The capacitance in the literature would not have such a big difference at different current density.

What's the possible reason for that?

Thank you very much.