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Chemistry

How Cyclic Voltammetry Differentiates Between Diffusion-Controlled and Adsorption-Controlled Processes

Quick fact

In cyclic voltammetry, a diffusion-controlled redox couple shows a peak current that scales with the square root of the scan rate, while an adsorption-controlled couple scales linearly with scan rate—a simple test that instantly distinguishes the two regimes.

Why this is interesting

Imagine watching a runner in a race: some sprint freely, while others cling to the track and barely move. How can a simple voltage sweep tell you which mode your molecules are in?