Hi Walaa,

Yes, you can use Randles-Sevcik equation, but consider that with carbon nanotubes layers you can have behavior of thin layer. You can check: Int. J. Electrochem. Sci., 4 (2009) 794 - 809; Sensors and Actuators B 133 (2008) 462–466 or Sensors and Actuators B 144 (2010) 153–158.

Best regards,

You can use the Randles-Sevcik equation, it relates peak current with the apparent electrochemically active surface area.

Check that paper

◦Friedl, J.; Bauer, C. M.; Rinaldi, A.; Stimming, U. Electron Transfer Kinetics of the VO2+/VO2+ Reaction on Multi-Walled Carbon Nanotubes. Carbon 2013, 63, 228–239.

They use EIS to get a hold of the surface area. You can use redox couple with known rate constant

Hi Walaa,

Yes, you can use Randles-Sevcik equation, but consider that with carbon nanotubes layers you can have behavior of thin layer. You can check: Int. J. Electrochem. Sci., 4 (2009) 794 - 809; Sensors and Actuators B 133 (2008) 462–466 or Sensors and Actuators B 144 (2010) 153–158.

Best regards,