Transient Techniques for Investigating Mass-Transport Limitations in Gas Diffusion Electrodes

Jaouen, Frédéric; Lindbergh, Göran; Wiezell, Katarina

doi:10.1149/1.1624295

Cited by 76 publications

(67 citation statements)

References 11 publications

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“…A threeelectrode configuration in EIS allows the measurement of half-cell impedance (anode or cathode) to be carried out. Some studies [21,22] were carried out in a galvanostatic mode with a 5% AC amplitude of the DC current [8,24,25] to obtain a linear response from the system and at frequencies from 10 KHz to 0.3Hz. The high frequency in the EIS measurements was limited due to the bandwidth of the electronic load.…”

Section: Methodsmentioning

confidence: 99%

Study of current distribution and oxygen diffusion in the fuel cell cathode catalyst layer through electrochemical impedance spectroscopy

Cruz-Manzo

Chen

Rama

2013

International Journal of Hydrogen Energy

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In this study, an analysis of the current distribution and oxygen diffusion in the Polymer Electrolyte Fuel Cell (PEFC) Cathode Catalyst Layer (CCL) has been carried out using Electrochemical Impedance Spectroscopy (EIS) measurements. Cathode EIS measurements obtained through a three-electrode configuration in the measurement system are compared with simulated EIS data from a previously-validated numerical model, which subsequently allows the diagnostics of spatio-temporal electrochemical performance of the PEFC cathode. The results show that low frequency EIS measurements commonly related to mass transport limitations are attributed to the low oxygen equilibrium concentration in the CCL-Gas Diffusion Layer (GDL) interface and the low diffusivity of oxygen through the CCL.Once the electrochemical and diffusion mechanisms of the CCL are calculated from the EIS measurements, a further analysis of the current density and oxygen concentration distributions through the CCL thickness is carried out. The results show that high ionic resistance within the CCL electrolyte skews the current distribution towards the membrane interface. Therefore the same average current density has to be provided by few catalyst sites near the membrane. The increase in ionic resistance results in a poor catalyst utilization through the CCL thickness. The results also show that non-steady oxygen diffusion in the CCL allows equilibrium to be established between the equilibrium oxygen concentration supplied at the GDL boundary and the surface concentration of the oxygen within the CCL. Overall, the study newly demonstrates that the developed technique can be applied to estimate the factors that influence the nature of polarization curves and to reveal the effect of kinetic, ohmic and mass transport mechanisms on current distribution through the thickness of the CCL from experimental EIS measurements.

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Section: Methodsmentioning

confidence: 99%

Study of current distribution and oxygen diffusion in the fuel cell cathode catalyst layer through electrochemical impedance spectroscopy

Cruz-Manzo

Chen

Rama

2013

International Journal of Hydrogen Energy

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“…These techniques exploit the differences in the time constants for processes across assemblies of different materials [19].…”

Section: Introductionmentioning

confidence: 99%

Spatially Resolved Voltage, Current and Electrochemical Impedance Spectroscopy Measurements

et al. 2011

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In this work a 50‐channel characterisation system for PEMFCs is presented. The system is capable of traditional electrochemical measurements (e.g. staircase voltammetry, chronoamperometry and cyclic voltammetry), and concurrent EIS measurements. Unlike previous implementations, this system relies on dedicated potentiostats for current and voltage control, and independent frequency response analysers (FRAs) at each channel. Segmented fuel cell hardware is used to illustrate the system's flexibility and capabilities. The results here include steady‐state data for cell characterisation under galvanostatic and potentiostatic control as well as spatially resolved impedance spectra.

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“…Over the past decade, interest in impedance studies of fuel cells has been growing exponentially. Of particular interest are physical impedance models, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] as these models help to extract the transport and kinetic parameters from the cell impedance.…”

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confidence: 99%

Impedance Spectroscopy Study of the PEM Fuel Cell Cathode with Nonuniform Nafion Loading

Reshetenko

Kulikovsky

2017

J. Electrochem. Soc.

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We report modeling and experimental study of impedance of the PEM fuel cell cathode with nonuniform ionomer loading. A physics–based model for the high–frequency impedance is developed and analytical solution for impedance is derived. Assuming that the CCL proton conductivity σp exponentially decays from the membrane surface, we fit the model to experimental spectra of the cell measured at the open circuit conditions. Fitting gives the characteristic scale of the σp decay, the average CCL proton conductivity and the double layer capacitance.

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Transient Techniques for Investigating Mass-Transport Limitations in Gas Diffusion Electrodes

Cited by 76 publications

References 11 publications

Study of current distribution and oxygen diffusion in the fuel cell cathode catalyst layer through electrochemical impedance spectroscopy

Study of current distribution and oxygen diffusion in the fuel cell cathode catalyst layer through electrochemical impedance spectroscopy

Spatially Resolved Voltage, Current and Electrochemical Impedance Spectroscopy Measurements

Impedance Spectroscopy Study of the PEM Fuel Cell Cathode with Nonuniform Nafion Loading

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