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• W1997491145 endingPage "B203" @default.
• W1997491145 startingPage "B203" @default.
• W1997491145 abstract "Graphical methods were used to extract values of constant-phase element (CPE) parameters and interfacial capacitance from the high-frequency part of impedance data collected on a polymer electrolyte membrane (PEM) fuel cell. The impedance data were recorded as a function of current density, time, temperature, backpressure, and flow channel and gas diffusion layer design. The effective capacitance was estimated under the assumption that the CPE behavior could be attributed to two-dimensional (2D) potential and current distributions. The value of the interfacial capacitance was reduced when the cell was operated under dry or flooded conditions. The interfacial capacitance decreased with time over a time scale consistent with the approach to a steady state. In addition to providing insight into physical processes, the parameters obtained from graphical methods can be used for model reduction when regressing impedance data. The methodology presented can be applied to electrochemical systems for which the high-frequency data reveal CPE behavior caused by 2D potential and current distributions." @default.
• W1997491145 created "2016-06-24" @default.
• W1997491145 creator A5053073774 @default.
• W1997491145 creator A5085356105 @default.
• W1997491145 date "2009-01-01" @default.
• W1997491145 modified "2023-09-23" @default.
• W1997491145 title "Graphical Estimation of Interfacial Capacitance of PEM Fuel Cells from Impedance Measurements" @default.
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• W1997491145 doi "https://doi.org/10.1149/1.3033382" @default.
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