I want to measure the GCD of my supercapacitor. In order to determine the charging and discharging current (A/g) we need to measure the mass of our sample. Is it the total mass of the lower electrode, the upper electrode and the separator or what does the mass of the sample mean? Any clarification is appreciable.
Dear friend Melkie Getnet Tadesse
The mass of the sample in GCD (galvanostatic charge-discharge) measurement refers to the total mass of the active material used in the electrodes. The lower and upper electrodes, along with the separator, are typically not included in the mass measurement because they do not contribute to the electrochemical performance of the supercapacitor.
Therefore, the mass of the sample is determined by weighing the electrodes after they have been coated with the active material. It is important to accurately measure the mass of the sample in order to calculate the specific capacitance (F/g) and specific energy (Wh/kg) of the supercapacitor.
It is also worth noting that the mass of the sample should be recorded at each stage of the experiment, including after any drying or annealing steps, to ensure consistent and accurate measurements.
Sure, here are some references on GCD measurement of supercapacitors:
1. Salanne, M., Rotenberg, B., Naoi, K., Kaneko, K., Taberna, P. L., Grey, C. P., & Dunn, B. (2016). Efficient storage mechanisms for building better supercapacitors. Nature Energy, 1(6), 16070. https://doi.org/10.1038/nenergy.2016.70
2. Zhang, K., Liu, H., Lee, S., Jimenez-Palacios, J. L., & Zhao, X. S. (2015). Recent developments and prospects of redox couple-based electrolytes in organic/inorganic hybrid supercapacitors. Journal of Power Sources, 275, 370-386. https://doi.org/10.1016/j.jpowsour.2014.11.137
3. Li, Y., Ma, Y., Li, H., Liu, Y., & Li, C. (2016). The effect of the mass of active materials on the electrochemical performance of a MnO2–carbon nanotube composite supercapacitor. Journal of Materials Science: Materials in Electronics, 27(2), 1377-1382. https://doi.org/10.1007/s10854-015-4003-x
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