VoltaMaster 4 7.8

VoltaMaster 4 -Electrochemical Software illustrations of use.
Different modes of ohmic drop compensation are compared: No, Dynamic and Static auto using cyclic voltammetries performed with Pt in H2S04 [1] [3]. The cell resistance is determined (±2.5 Ohms) and the cyclic voltammetries obtained with Dynamic and Static auto ODC exhibit a peak shift versus the cyclic voltammetry obtained with No ODC as expected from theory. (Peak shift = 25 mV = 10 mA * 2.5 Ohm). The cell resistance is measured and the potential Set value = Potential + Ohmic drop is recorded with the A/D IN additional channel.

The principle is to measure the impedance at fixed potential during a frequency scan. Electrochemical Impedance Spectroscopy is useful to study the kinetics at the interfaces and to distinguish between the various mechanisms which regulate the charge transfer. Here, we examine a heterogeneous charge transfer going with a linear diffusion process. In such a case, the resulting Nyquist diagram shows two distinct

The interest of a new electrochemical method, the 'Universal Differential Pulse" method, is investigated. The principle of the method is briefly described. The experimental curves and results obtained on platinum in sulphuric acid are compared with traditional experiments such as Linear Voltammetry (Cyclic Voltammetry), Chrono Amperometry and Electrochemical impedance measurement with potential scan at fixed frequency. The 'Universal Differential Pulse" method can provide simultaneously information about the "resistive" and the "capacitive" behaviour of the electrochemical interface. Since it is one single experiment performed at medium scan rates, the electroactive interface can be expected to be homogeneous within the experiment.

The "pitting potential" and the "repassivation potential" of 316L stainless steel are experimentally determined at -0.4 °C and 50°C in NaCl 3g/l. They are determined from the experimental polarisation curve.

Gal. Logarithmic CV with logarithmic progression for i is used to determine the maxiBattery test. The method mum current that a battery can supply at its nominal value. The applied current and the battery measured potential are plotted versus time.

To illustrate the outstanding capabilities of VoltaMaster 4 version 4 regarding trace analysis, we offer you to review a measurement procedure established for Cl- trace analysis using a HMDE model MDE150 and the Analytical Electrochemical Laboratory model VoltaLab 50.

Peak analysis consists in determining the position, height and width of the peak. The user selects the limits eitheir with a cursor or by entering the point number. A selection of different base lines is offered. By clicking the "Draw" button, the results are displayed. "Save" button will save them the curve's result folder. "Print" will print a short report.

The "Linear extraction" post run processing tool is very convenient to reduce the file size by reducing the number of experimental points without loosing any information.
Although it is possible to decide to minimise the size file by taking one point out of ten for instance, one can easily imagine that peak information may be lost.
With the "Linear extraction" intelligent filter, you can control in four dimensions (time, potential, current and coulombs) the filtering process.
Whenever your experiment generates a file above 10 thousand of points you will benefit from the "Linear extraction" filtering them down to a reasonable few hundreds points file.