Hi all, can anyone please suggest how to "subtract" the double-layer charge from the total charge in the hydrogen absorption/desorption region of CV (using origin or excel)? Please see the attached image. To get this CV, 0.5 M sulfuric acid was used as an electrolyte, catalyst ink coated glassy carbon was used as working electrode, Pt was used as a counter and SHE was used as a reference electrode. The potential was set between 50 mV to 1200 mV and the scan rate was 20 mV/sec. Please let me know if you need additional details. The purpose is to find the electrochemically active surface area.
I would be happy to connect with anyone working on topics related to fuel cells and electrocatalysts. Thanks
If your purpose is to get the electrochemical active surface area, why did you select such a voltage window. In general, ECSA is determined by CV tests in a small and nonfaradiac voltage range. In your case, the current response has obvious contribution from some redox reactions.
I have figured out the answer to my question. Let me know if anyone needs help.
Bin Zhao the potential window (0.05 V to 1.2 V) corresponds to just above hydrogen evolution to just below the oxygen evolution potentials in this case. Please check the literature papers also (e.g. Yannick et al, analytical chemistry, vol 82, no. 15, 2010). Thanks.
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