The voltammetric response of a conical electrode

Abstract

A theoretical study has predicted the course of chronoamperometry following the imposition of a large potential step on an electrode in the shape of an infinite cone, under the usual diffusion-controlled conditions (with diffusivity D ). We show how the current density (at a distance r from the apex and at a time t after the step) depends on r²/Dt and on the semi-apical angle of the cone. The long-time version of this relationship predicts that a cone with a semi-apical angle of 54.74° will display the unique voltammetric property of independence from D. The short-time relationship throw light on the voltammetric behaviour of vertices in general. © 1997 Elsevier Science S.A.

Keywords: Voltammetry; Conical electrode; Chronoamperometry

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