Advanced Electrochemistry Measurements

Coulometric Titrations are titrations that use an electrical current as the titrant.  This is easily done using MicroLab’s Model 272 Electroplating/Coulometry Power Supply or Model 290 Sensor Adaptor connected to our FS-522 interface. The MicroLab interface supplies a constant voltage across electrodes driving the electrochemical reaction.  MicroLab software integrates the current over time to determine the coulombs passed through the system.

GE5

recent article published by Professor Thomas Kuntzleman describes the use of MicroLab equipment in a simple coulometric titration.

If you would like to couple your coulometric cell current with potentiometric measurements, MicroLab offers our unique Model 292 Electrochemistry Module.  It uses electrically-isolated sensor amplifiers to prevent coulometric cell current from interfering with pH, Redox, ISE and amperometric end-point measurements.

GE6

Cyclic Voltammetry is an advanced electrochemistry topic explored in upper division undergraduate courses. As the name implies, cyclic voltammetry measures the current produced between electrodes as the applied potential is increased, then decreased back to the starting potential.  It is used to study electrochemical properties and can provide information on electron stoichiometry, diffusion coefficients, reversibility, formal reduction potential, binding constants and more.  Easy-to-use, mouse-driven software allows student to scan samples at variable ramp rates by changing either the scan speed (steps per second) or the change in potential (voltage change per step).

AE10

This sample voltammogram shown above, was taken by Stewart, et. al. for the oxidation of tetramethyl-p-phenylenediamine in the J. Chem. Ed. article.