DigiElch - Overview

DigiElch is a Win32 program that computes the electrical current and the concentration profiles for any user-defined mechanism comprising an arbitrary number of charge transfer steps and first- or second-order chemical reactions. The program works for the most common electrode geometries including the simulation of thin layer cell experiments and the exact (two-dimensional) simulation of the electrical current response at band and disk microelectrodes. Effects such as IR-drop and/or double layer charging can be included in all these simulations.
The basic module of the program includes only a simulator for cyclic voltammetry. However, the functionality can be extended by purchasing  licenses for extension modules, for instance those for chrono-amperometry or square-wave voltammetry. Real experimental current curves (stored as U/I- or t/I-couples in ASCII-files) can be imported into DigiElch and compared with simulated ones. The determination of thermodynamic and kinetic parameters involved in the underlying reaction scheme can be accomplished in this way either by "trial and error" (DigiElch - Standard) or by making use of the non-linear fitting procedure implemented into DigiElch - Professional.

Watch movies to see program features in detail.

DigiElch - Standard

• Very fast and accurate simulation of the current response for any
     user-defined mechanism that can be compose of charge-transfer
     steps and first- or second-order chemical reactions.
• 1D simulation of finite and semi-infinite diffusion processes for the
     most common regular 1D-electrode geometries.
• real 2D-simulations of such user-defined mechanisms for the band
     and disk electrode.
• inclusion of IR-drop and double layer charging.
• Two different simulation methods - a very fast "fixed grid
     simulator" providing extremely high exponential converegence
     towards zero for the simulated flux error and a relatively slow
     Adaptive Grid Simulator. The latter may be useful for simulating
     accurate concentration profiles and/or for checking the accuracy of
     the fixed grid simulator by an independent method.
• Options for customizing colors and style of the screen  display.
• Export of the screen display in Windows meta file format.
• Export of simulated current curves and concentration profiles into
     ASCII-files. Several formatting options which enable the exported
     data to be imported into third-party presentation software.
• Import of experimental (or re-import of simulated) current curves.
     In this way (and by using the Copy/Paste command) any number
     of such curves can be simultaneously displayed on the screen for
     studying the effect of parameter variations on simulated curves or
     for determining parameters yielding the "best fit" between
     experimental and simulated curves using a "trial and error"
     strategy.

DigiElch - Professional

• Same features as reported above for DigiElch-Standard.
     Additionally, simulated curve can be fitted to match an
    experimental curve with the smallest possible standard
     deviation using a non-linear regression strategy.

Limitations of the "Trial installation"

The not activated program runs as demo version for up to 14 days. As long as the program has not been activated the following restrictions apply:

• Simulation files cannot be exported.
• The screen display cannot be saved or printed.
• ASCII files (containing the data of electrochemical
     experiments) cannot be imported.