Freeware

There are several freeware software packages that can be downloaded. Please click on the links provided to go to pages were the software is described further and can be downloaded.

Fit ‘Trumpet’ Plots and SWV data: Jellyfit

Jellyfit is a windows-based program that can fit trumpet plots and ‘square-wave voltammetry (SWV) plots’ using several electron-transfer systems and models. SWV plots are described in DOI:10.1021/jp0134291. Trumpet plots are plots in which the peak position of cyclic voltammograms of protein films are given as a function of scan rate. Details of trumpet plots can be found in the many papers of Prof. Fraser Armstrong.

What is Jellyfit?

Jellyfit is a windows-based program that can fit trumpet plots and SWV plots (see ref. 1 below) using several electron-transfer systems and models.

The electron-transfer models it can use are:

  1. Butler-Volmer, Butler-Volmer with ‘gated’ electron transfer (see Ref. 1), DOS Marcus equation
  2. One (Ox – Red) or two electron (Ox-Semi-Red) systems
  3. Coupled reactions (in the form of a ‘square scheme’

Download

You can download version 2.1 (earlier version have not been released) and its documentation. If any unexpected results or bugs are encountered, please contact us. Special ‘rate-files’ can be downloaded if the option of pre-calculated ET rates is to be used for the DOS-Marcus theory (see documentation).

References

Jeuken, L. J. C., Armstrong, F. A. (2002) Insights into Gated Electron-transfer Kinetics at the Electrode-Protein Interface: A Square Wave Voltammetry Study of the Blue Copper Protein Azurin. J. Phys. Chem. B, 106, 2304-2313

Fit Impedance Data: EISfit

Eisfit is a windows-based program that fits impedance spectra to equivalent circuits. This program provides the possibility to fit the data in different representations (i.e., normalised Cole-Cole plots or Nequist plots), which provides an intuitive way of weighting the data in a way that highlights whatever circuit element you are most interested in. At the moment, this program can only read data files from FRA (Ecochemie), CompactStat (Ivium) or the ASCII files generated by the software from CH Instruments. However, different reading formats can be included upon request.

What is EISfit?

Eisfit is a windows-based program that fits impedance spectra to equivalent circuits. This program provides the possibility to fit the data in different representations (i.e., normalised Cole-Cole plots or Nequist plots), which provides an intuitive way of weighting the data in a way that highlights whatever circuit element you are most interested in. At the moment, this program can only read data files from FRA (Obsolete Ecochemie/Metrohm software), CompactStat (Ivium) or the ASCII files generated by the software from CH Instruments. However, different reading formats can be included upon request.

Download

You can now download version 1.06 and its documentation. If any unexpected results are encountered, please contact me.

If you like to try the software but not have any ‘FRA’ files, ‘Ivium’ files or ‘CH Instruments’ files available you can download two test files here. Test1 is measured using a ‘dummy’ cell with two resistors and a capacitor. Test 2 is measured on a complex solid-liquid interface.