Devanathan-Stachurski Permeation Cell, Model A

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The Devanathan-Stachurski Permeation Cell is an electrochemical double-compartment, four-electrode setup. It is typically used to investigate hydrogen permeation in steels and other alloys (diffusion constants of hydrogen in materials, density of trap sites, and trap energies) as well as to evaluate ion-exchange membranes (gas diffusion coefficients/crossover, gas solubility, and gas permeability typically of H2, O2, CO, and H2S). Moreover, this cell can also be used with Impedance Spectroscopy to measure the ionic conductivity of membranes in 2- and 4-probe setups. In the former case, a current is applied between polarising electrodes while the potential is measured across separate reference electrodes. The measurement is, therefore, agnostic to any side reactions occurring at the polarising electrodes. Luggin capillaries, which establish an ionic connection between the permeated material and the reference electrode, minimise the contribution from the ohmic drop in an aqueous electrolyte. These Luggin capillaries are located close to the studied permeable material and outside of the current path between polarising electrodes. The cell elements are constructed with materials that are inert to the sample (PEEK and other fluorinated plastics). It is well-suited to both aqueous (FKM O-Rings) and organic solvent (FFKM O-Rings) electrolyte requirements. The construction is gas-tight. Reference electrodes and polarising electrodes are not included in the setup and should be added to the quotation separately.