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Sensors 2010, 10(7), 6821-6835; doi:10.3390/s100706821
Article

Voltammetry under a Controlled Temperature Gradient

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Received: 30 May 2010 / Revised: 20 June 2010 / Accepted: 1 July 2010 / Published: 14 July 2010
(This article belongs to the Section Physical Sensors)
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Abstract

Electrochemical measurements are generally done under isothermal conditions. Here we report on the application of a controlled temperature gradient between the working electrode surface and the solution. Using electrochemical sensors prepared on ceramic materials with extremely high specific heat conductivity, the temperature gradient between the electrode and solution was applied here as a second driving force. This application of the Soret phenomenon increases the mass transfer in the Nernst layer and enables more accurate control of the electrode response enhancement by a combination of diffusion and thermal diffusion. We have thus studied the effect of Soret phenomenon by cyclic voltammetry measurements in ferro/ferricyanide. The time dependence of sensor response disappears when applying the Soret phenomenon, and the complicated shape of the cyclic voltammogram is replaced by a simple exponential curve. We have derived the Cotrell-Soret equation describing the steady-state response with an applied temperature difference.
Keywords: Soret phenomenon; electrochemical sensor; thermal diffusion; cyclic voltammetry Soret phenomenon; electrochemical sensor; thermal diffusion; cyclic voltammetry
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Krejci, J.; Sajdlova, Z.; Krejci, J., Jr.; Marvanek, T. Voltammetry under a Controlled Temperature Gradient. Sensors 2010, 10, 6821-6835.

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