On experimental determination of cell constants for interdigitated electrodes
By Dizon, Arthur; Orazem, Mark E.
Published in Electrochimica Acta 2020
The discrepancy reported in the literature between interdigitated electrode cell constants obtained from experiment and those obtained from numerical simulation is attributed, in part, to geometry-induced frequency dispersion. The frequency dispersion associated with the interdigitated electrode geometry yields a complex ohmic impedance with real asymptotic limits for ohmic resistance at high and low frequencies. The determination of cell constants from impedance measurements performed on gold interdigitated electrodes in aqueous KCl solutions of differing electrolyte resistivity is shown to be confounded by the presence of a surface film and by extrapolated values that fell between the high- and low-frequency ohmic resistances. A method is presented to ensure that impedance measurements performed in aqueous KCl solutions of differing concentration yields the low-frequency ohmic resistance, from which a well-defined cell constant is obtained that agrees with numerical simulations. The experimental results are supported by finite-element simulations that accounted for the presence of a film.
Microsoft is Ending Support for Windows 7
Microsoft will discontinue support for Windows 7 on January 14, 2020 which means Gamry will also be discontinuing support for Windows 7. If you are upgrading to Windows 10, like many companies and institutions, you need to be running Version 7 of our s oftware . Please note that only USB and Ethernet-based instruments can run in Version 7. Eligible users can download the latest version of our software through our online Client Portal .
If you haven't already registered your instrument, you can do so through the Client Portal .
Please email Technical Support if you have any questions regarding this transition. Please be sure to include your instrument model and serial number when contacting us.