Hi Arulmani,

Below procedure is for Pt electrode in acidic electrolyte. Potentials are vs RHE.

Step 1. Saturate the electrolyte with N2 (or Ar) keeping the WE at 0.1 V for > 30 min and the scan  CV at say 50 mV s−1from 0.1 - 1 V.

Step 2. Saturate the electrolyte with CO keeping WE at 0.1 for 30 min. Switch the gas from CO to N2 (or Ar) and purge for > 30 min maintaining the WE at 0.1 V. Scan a CV from 0.1 to 1 V.

Take baseline from Step 1. Do not chenge the order of measurements, because complete stripping of CO is difficult.

ECSA calculation is similar to that with H2 adsorption/desorption. First find the total charge of stripped CO by integrating the peak (in C). Then devide the charge by the standard charge of monolayer CO surface coverage (420 10^-2 C/m^2) and the absolute value of loaded Pt (in g). Finally, you will get ECSA in m^2/g unit.

Hope this will help you.