The following procedures are commonly followed when testing a supercapacitor utilising a biologic electrochemical workstation (ECW) for galvanostatic charge-discharge (GCD): The supercapacitor will have a positive and negative terminal, which should be connected to the appropriate positive and negative terminals on the ECW. The ECW will control the voltage across the supercapacitor and measure the current. Before starting the experiment, the ECW should be configured with the appropriate voltage and current ranges for the tested supercapacitor. This may include setting the voltage range for the charge and discharge cycles and the current range for the charge and discharge cycles. The ECW will apply a constant current to the supercapacitor during the charge cycle. The voltage and current will be recorded as the supercapacitor charges. The duration of the charge cycle will depend on the capacity of the supercapacitor; the current applied, and the voltage range of the supercapacitor. After the charge cycle is complete, the ECW will switch to a discharge mode and apply a constant current to the supercapacitor. The voltage and current will be recorded as the supercapacitor discharges. The duration of the discharge cycle will depend on the capacity of the supercapacitor, the current applied, and the voltage range of the supercapacitor. After the charge and discharge cycles are complete, the data can be analyzed to determine the performance of the supercapacitor. This may include calculating the specific capacitance, the energy density, and the power density.