Changing Scan Rates

A researcher can learn a lot about the analyte from collecting multiple CVs at different scan rates. In order to create a trustworthy plot of the changes at different scan rates, it is necessary to collect CVs at 5 – 6 different scan rates and save them for later analysis. A very quick qualitative check of the electrochemical reversibility of a wave can be made as the CVs are collected. An electrochemically reversible wave (fast electron transfer rate) will have the same Ep’s at every scan rate,

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whereas an electrochemically irreversible feature (slow electron transfer rate) will have Ep’s that drift to more extreme potentials with increased scan rate.

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