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Chemistry · Glossary

What is Chronoamperometry?

Definition 15.11 University Chemistry — Year 3 · Chapter 15 — Electrode Kinetics and Electroanalysis

Chronoamperometry records the current against time after a step of the electrode potential.

Chronoamperometry (model: D = 1.0 × 10-5\, cm2\, s-1, c* = 1.0\, mM, a 3\, mm disk). Left: the depletion layer grows as √Dt, about 30\, µ m after 0.1\, s and 350\, µ m after 16\, s. Right: the Cottrell current is proportional to t-1/2; its slope gives D.
Chronoamperometry (model: D=1.0×10−5 cm2 s−1D = 1.0 \times 10^{-5}\,\mathrm{cm}^{2}\,\mathrm{s}^{-1}, c∗=1.0 mMc^* = 1.0\,\mathrm{mM}, a 3 mm3\,\mathrm{mm} disk). Left: the depletion layer grows as Dt\sqrt{Dt}, about 30 µm30\,\text{µ}\mathrm{m} after 0.1 s0.1\,\mathrm{s} and 350 µm350\,\text{µ}\mathrm{m} after 16 s16\,\mathrm{s}. Right: the Cottrell current is proportional to t−1/2t^{-1/2}; its slope gives DD.
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