How do we calculate the surface coverage area of the electrode using electrochemical study?
Monika Antil
Cyclic Voltammetry (CV) : In CV, you cycle the potential of the working electrode (WE) within a chosen range while measuring the current response. Choose a potential window where there are no Faradaic currents (electron transfer reactions), only the charging/discharging of the electrical double layer at the electrode surface. Perform CV at different scan rates. The current due to the double-layer capacitance (Cdl) is proportional to the scan rate. By plotting the current vs. scan rate and analyzing the slope, you can calculate double-layer capacitance. Knowing the specific capacitance (Cs) of a flat surface of the electrode material, you can estimate the ECSA using the formula: ECSA = Cdl / Cs. Underpotential Deposition (UPD):This method relies on the adsorption of a well-defined monolayer of a molecule onto the electrode surface. By measuring the charge required to completely reduce the adsorbed monolayer (obtained from the CV curve), and knowing the charge density per monolayer for that specific adsorbate, you can calculate the ECSA. I hope this information helps you! Thanks!
Electrochemical methods provide a way to estimate the electrochemically active surface area (ECSA) of a three-electrode system, rather than the total surface area. This is because only a portion of the electrode participates in the electrochemical reaction of interest. Here are two common techniques:
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