I have coated 50 µL of PEDOT: PSS on a 25 x 25 cm dimension PET (0.513 gm in weight). I want to measure the GCD of my supercapacitor. How can I find the active mass of the electrode to set the charging current? Assume 1 A/g current density.
o find the active mass of the electrode for setting the charging current of your supercapacitor, you need to calculate the mass of the PEDOT: PSS coated on the PET substrate.First, convert the weight of the PET substrate from grams to milligrams since we will be working with smaller units:
Weight of PET substrate = 0.513 g = 513 mg
Next, calculate the coating mass per unit area:
Coating mass per unit area = Weight of PEDOT: PSS / Area of PET substrate
Since you coated 50 µL of PEDOT: PSS, we need to convert this volume to a weight using the known density of PEDOT: PSS. Let's assume the density is approximately 1.4 g/mL:
Weight of PEDOT: PSS = Volume of PEDOT: PSS x Density of PEDOT: PSS
Weight of PEDOT: PSS = 50 µL x (1.4 g/mL)
Now, calculate the area of the PET substrate:
Area of PET substrate = Length x Width
Since the dimensions are given as 25 x 25 cm, convert them to meters:
Length = 25 cm = 0.25 m Width = 25 cm = 0.25 m
Area of PET substrate = 0.25 m x 0.25 m = 0.0625 m²
Finally, calculate the coating mass per unit area:
Coating mass per unit area = Weight of PEDOT: PSS / Area of PET substrate
Now, you can use the coating mass per unit area to calculate the active mass of the electrode:
Active mass of electrode = Coating mass per unit area x Area of the electrode
Assuming you have coated the PEDOT: PSS on one side of the PET substrate, the area of the electrode would be the same as the area of the PET substrate.
Active mass of electrode = Coating mass per unit area x Area of PET substrate
Now you can set the charging current using the current density provided (1 A/g):
Charging current = Active mass of electrode x Current density
the current density is given as 1 A/g, so if you want the charging current in amperes, you need to convert the active mass of the electrode to gram
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