Shielding of a Microdisc Electrode Surrounded by an Adsorbing Surface

Journal article

Abstract:: Microdisc electrodes are usually made by surrounding a metal wire with a diameter of a few microns in a flat insulating sheath made of glass or another insulating material. The sheath is generally assumed to play no role in the voltammetry at the microdisc electrode. However, in some cases, and especially for experiments with nanoparticles, significant adsorption can occur onto the sheath, perturbing the current response measured at the disc. We report theoretical calculations of the effect of shielding by the insulating sheath of microelectrodes and show that it can significantly influence the magnitude of the current, even for relatively small levels of adsorption, not least because of the typically very large area of the insulation relative to the electrode size. Working curves are provided to permit the analysis of experimental data.

Keywords:: adsorption

shielding

voltammetry

microdisc electrode

insulating sheath
Pubs id:: pubs:477846
UUID:: uuid:01ce419f-4c08-4368-9b37-c8d24216ef64
Local pid:: pubs:477846
Source identifiers:: 477846
Deposit date:: 2014-08-12
ARK identifier:: ark:/29072/ora_01ce419f4c0843689b37c8d24216ef64

Copyright holder:: John Wiley and Sons, Inc
Notes:: This is the peer reviewed version of the following article: Eloul, S. and Compton, R. G. (2014), Shielding of a Microdisc Electrode Surrounded by an Adsorbing Surface. CHEMELECTROCHEM, 1: 917–924, which has been published in final form at doi: 10.1002/celc.201400005. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

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