Fill in the blank: For determination of electroactive surface area, cyclic volta

Question

Fill in the blank:

For determination of electroactive surface area, cyclic voltammetry (CV) is commonly carried out in in 4mM Fe(CN)6/1M KNO3 solution at a switching potential of 800 mV versus a _________________ reference electrode. The counter electrode is composed of a ______________________ wire in most experiments. Cyclic voltammagrams are measured at various scan rates. The____________________ and _________________________ peaks are extracted from the CV plots, and a Cottrell plot is prepared with plots the ____________________ versus the___________________ . Using this plot, the electroactive surface area of the electrode is determined using the ________________ equation (below):

______________________ (equation 1)

Explanation / Answer

For determination of electro active surface area, cyclic Voltammetry is commonly carried out in 4mM Fe(CN)6/1M KNO3 solution at a swtching potential of 800mv versues a silver- silver chloride (Ag/AgCl) reference electrode.

The counter electrode is compossed of a Glassy Carbon wire in most experiments.

Cyclic voltammagrams are measured at various scan rates.

The Oxidation Peak and the Reduction peaks are extracted from the CV plots.

A cottrell is prepared with plots the Potential (I) versues the Current (I).

Using the plot , The electroactive surface area of the electrode is determined using the equation

Ip = Kn3/2AD1/2Cbv1/2

K - Constant 2.72 x 105

n -No. of moles of electrons transferred per mole

A- Area of electrode (Cm2)

D - Diffusion co-efficient (Cm2/s)

Cb - Solution concentration (mole/Lit)

v - Scan rate of the potential ( Volt/S) .

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