Effect of proton conductivity transients on PEM fuel cell impedance: Formation of a low–frequency inductive loop
Andrei Kulikovsky
Abstract
A model for PEMFC cathode impedance is developed. The model includes transient response of catalyst layer proton conductivity to cell current density variation. Analytical solution shows that transient conductivity leads to formation of a low–frequency inductive loop in the Nyquist spectrum. This loop has been observed in numerous experiments and its nature has long been discussed in literature. The results of this work provide a new mechanism of loop formation.
Topics & Concepts
Nyquist plotConductivityProton exchange membrane fuel cellTransient (computer programming)Electrical impedanceCathodeTransient responseLoop (graph theory)ChemistryMaterials scienceAnalytical Chemistry (journal)Dielectric spectroscopyPhysicsMembraneElectrodeElectrical engineeringChromatographyElectrochemistryPhysical chemistryOperating systemComputer scienceEngineeringMathematicsQuantum mechanicsBiochemistryCombinatoricsFuel Cells and Related MaterialsElectrocatalysts for Energy ConversionMembrane-based Ion Separation Techniques