Transient Voltammetry at Electrodes Modified with a Random Array of Spherical Nanoparticles: Theory
The simple one-electron reduction, A + e- ⇄ B, is studied at a random array of spherical nanoparticles attached to a planar electrode. Electron transfer is assumed to occur exclusively on the surface of the nanoparticles; the electrode simply acts as a conductive support. Voltammetry is simulated us...
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| פורמט: | Journal article |
| שפה: | English |
| יצא לאור: |
2010
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| סיכום: | The simple one-electron reduction, A + e- ⇄ B, is studied at a random array of spherical nanoparticles attached to a planar electrode. Electron transfer is assumed to occur exclusively on the surface of the nanoparticles; the electrode simply acts as a conductive support. Voltammetry is simulated using the alternating direction implicit (ADI) variant of the finite difference method. The diffusion-controlled chronoamperometric response is studied as a function of nanoparticle surface coverage, and the cyclic voltammetry is studied as a function of electrochemical rate constant, voltage scan rate, and nanoparticle surface coverage. Also considered is the extent to which a random array of spherical nanoparticles can usefully be approximated as an array of discs with an equal surface coverage. © 2010 American Chemical Society. |
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