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Dieter Britz

Digital simulation of chronoamperometry at an electrode within a hemispherical polymer drop containing an enzyme: comparison of a hemispherical with a flat disk electrode

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  • Dieter Britz
  • Jörg Strutwolf, Universität Tübingen, Germany
Current-time and steady state current behaviour was simulated for the
cases of a hemispherical and flat inlaid disk electrodes located under a
hemispherical polymer drop containing an enzyme which converts
a substrate diffusing into the drop into a product that is electroactive
at the electrode. As well, a cylindrical electrode with length much greater
than its diameter and coated with a layer of polymer/enzyme was treated.
The ratio of steady state currents at the hemispherical to the disk
electrode is not, as has sometimes been assumed, always equal to π/2;
indeed this is only approached for polymer drops with large spillover ratio,
that is, having a radius much larger than that of the electrodes. Steady
state currents for all electrode geometries (including the cylinder) go
through a maximum for some spillover ratio and then approach a constant
value for larger spillover ratios. This constant value is the same as that
for the diffusion limited current in a semi-infinite medium. For a cylindrical
electrode, the steady state current tends towards zero for large spillover
Original languageEnglish
JournalBiosensors and Bioelectronics
Pages (from-to)269-277
Number of pages9
Publication statusPublished - 2013

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