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Linear sweep voltammetry at microband electrodes

1987; Elsevier BV; Volume: 237; Issue: 2 Linguagem: Inglês

10.1016/0022-0728(87)85229-4

2590-2954

Koichi Aoki, Koichi Tokuda,

Electrochemical sensors and biosensors

An expression for reversible linear sweep voltammograms at microband electrodes was derived by application of an approximate equation for the chronoamperometric curve. The voltammogram has a parameter p = (nFvw2/RTD)12, where v is the potential sweep rate, w is the width of the microband electrode and D is the diffusion coefficient. The voltammogram approaches a quasi-steady state as the values of p decrease. The peak current was evaluated as a function of p and an analytical approximate equation was derived. In order to examine the validity of the equation, an experimental study was made at platinum microband electrodes (w = 0.02–0.2 mm). The peak currents measured experimentally were in good agreement with those predicted theoretically for various values of the sweep rate and different widths of the electrodes.