Current-voltage curves of composite bipolar membrane in alcohol-water solutions

Article Abstract:

The current-voltage curves of a composite bipolar membrane (CBM) were experimentally measured for the various mole fractions of methanol-water, ethanol-water and n-propanol-water mixed solution systems using 0.1 mol/L LiCl as electrolyte for each solution system. Results showed that a CBM has the characteristics of a bipolar membrane. The current-voltage curves showed that the maximum local effective value of a CBM resistance will increase with an increase in the mole fraction of alcohol. This is attributable to the weaker dissociative ability of alcohol as compared to water.

Electrochemistry, Electrolyte solutions, Membranes (Technology), Electric currents, Electric current, Voltage, Electric potential

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Membrane potential across charged membranes in organic solutions

Article Abstract:

A measurement of the membrane potentials across cation- and anion-exchange membranes for five LiBr-various solvent systems found good agreement between theoretical predictions and experimental data. The solvents used were water, dimethyl sulfoxide, ethylene glycol, methanol and n-propanol. The Donnan equilibrium and the Nernst-Planck equation of ion flux were the basis of analysis of experimental data, with the effect of ion pairing of the electrolyte in the external solution taken into account.

Ions, Solvents, Ion migration, Charge density waves

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Membrane potential across a high water content anion-exchange membrane separating two solutions with a common counterion but two different co-ions

Article Abstract:

A novel theory for bi-co-ionic potential which is a potential difference across a membrane due to the difference in co-ions is presented. A low-charged anion-exchange membrane of poly(ethyleneimine) and poly(vinyl alcohol) with high water content was prepared. The potential difference in the system of 1/2CaCl2 or KCl/membrane/1/2MgCl2 was calculated by changing the external electrolyte concentrations and examined according to the theory.

Ion exchange, Anions

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