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Cyclic Voltammgram: How does the peak current vary with sweep rate? Why? How does the peak...

Cyclic Voltammgram:

  • How does the peak current vary with sweep rate? Why?

  • How does the peak current vary with conc?

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Answer #1

Total current in a system, i = ifaradic +icharging and faradic current is fixed with scan rate.

Scan rate = dV/dt,

i = ifaradic + dQ/dt, i = ifaradic + dQ/dV*scan rate,

i = ifaradic + C*scan rate

when scan rate increases, the charging current will increase and actual capacitance is constant for a material.So when we increase the frequency of the cycle, the peak current increases.

The peak current is proportional to the analyte's concentration in the solution, so is the change in peak current with respect to concentration.

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