6533b835fe1ef96bd129ea96
RESEARCH PRODUCT
Current‐voltage curves of bipolar membranes
Patricio Ramı́rezS. ReichleHeiner StrathmannSalvador MafeHans-jürgen Rappsubject
Arrhenius equationIv CharacteristicProton TransportTransfer ReactionsMembranesChemistryMembranes ; Iv Characteristic ; Temperature Effects ; Arrhenius Equation ; Water ; Dissociation ; Transfer Reactions ; Proton TransportUNESCO::FÍSICAGeneral Physics and AstronomyWaterChemical reactionDissociation (chemistry)Ionsymbols.namesakeTemperature EffectsMembraneChemical physics:FÍSICA [UNESCO]Proton transportsymbolsWater splittingTransport phenomenaArrhenius EquationDissociationNuclear chemistrydescription
Bipolar membranes consist of a layered ion‐exchange structure composed of a cation selective membrane joined to an anion selective membrane. They are analogous to semiconductor p‐n devices as both of them present current‐voltage curves exhibiting similar rectification properties. In this article, we present some current‐voltage curves obtained for different bipolar membranes at several temperatures. The results can be interpreted in terms of a simple model for ion transport and field‐enhanced water dissociation previously developed. The mechanism responsible for water splitting is assumed to be a catalytic proton transfer reaction between the charged groups and the water at the membrane interface. The effects of temperature are taken into account by introducing an Arrhenius‐type relationship for the dependence of the forward rate constant of the reaction on temperature. Finally, comparison between theory and experiments provides reasonable values for the parameters introduced in the theoretical model. The analysis aims at developing a better physical understanding of a process in which chemical reactions and transport phenomena are coupled in such a way that the potential technological applications depend strongly on this coupling. Salvador.Mafe@uv.es
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1992-07-01 |