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- Title
How does a reversible electrode respond in a.c. voltammetry? Part 2: solutions for the periodic current amplitudes.
- Authors
Myland, Jan C.; Oldham, Keith B.
- Abstract
In a.c. voltammetry, a programmed electrical potential—a linear ramp modulated by a sine wave of frequency ω and modest amplitude—is applied to the working electrode of a voltammetric cell. If the electrolyte solution contains a solute that undergoes a reversible electron exchange at the electrode, then the ensuing faradaic current incorporates two aperiodic components, together with a pseudosinusoidal component of every frequency that is an integer multiple of ω. An exact mathematical model is presented that predicts how the time-dependent amplitudes of each of these latter harmonic currents evolve during the experiment. This analytical model, which does not invoke simulation or Fourier transformation, is useful only at early voltammetric times, but a numerical scheme extends the solution to encompass the entire scan. Amazingly, the time-dependent amplitudes of the periodic currents match their semiintegrals in shape.
- Subjects
VOLTAMMETRY; FARADAIC current; FOURIER transforms; ELECTROLYTE solutions; ELECTRODES; ELECTRON donors
- Publication
Journal of Solid State Electrochemistry, 2019, Vol 23, Issue 7, p2061
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-019-04238-0