Hi, I am doing research in CNTs. I would like to know that how should be the solution resistance, charge transfer resistance and capacitance? (for supercapacitor application). The electrolyte is 1 M sulphuric acid.
Depends on your purity of sample, if its sample is good but not a conductivity one
(1) you may get semi-circle with high resistance
If sample is not good and not conducting one means
(2) you may get linear line with high resistance, plenty of paper is available and you can refer my paper also
It depends on your electrode type and CNT's quality.
Basically, ideal CNT has only electric double layer capacitance and it does not have charge transfer resistance on EIS plot. However, if your CNT includes reactive impurites or defects/open edge structure,where can react with electrolyte, there shoud be semi circle on EIS plot caused by charge transfer. In addition, inductance will be at high frequency when using jelly roll type electrode.
Solution Resistance : The cross point with X axis. Actually it includes electrodes resistance, but usually it is negligible compared to solution resistance.
Charge transfer Resistance : Semi circle's Diameter on X axis.
Dear Rajamanickam Ragavan,
Simply you can take the values from starting point of impedence curve upto intersection values on x-axis for solution resistance and Semicircle diameter values for charge transfer resistance. But CNTs are shows EDLC behaviour so their semicircle is to much smaller or linear one
Dear Ragavan,
Please follow my recent article for better understanding.
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