AC impedance modelling study on porous electrodes of proton exchange membrane fuel cells using an agglomerate model

Gerteisen, Dietmar; Hakenjos, A.; Schumacher, Jürgen

doi:10.1016/j.jpowsour.2007.04.071

Cited by 54 publications

(39 citation statements)

References 16 publications

(36 reference statements)

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“…Other authors focus on the porosity of the electrodes through macroscopic studies [56][57][58]. All this research work is of great interest, in order to improve the various FC components.…”

Section: Introductionmentioning

confidence: 99%

Modelling of PEM Fuel Cell Performance: Steady-State and Dynamic Experimental Validation

2014

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This paper reports on the modelling of a commercial 1.2 kW proton exchange membrane fuel cell (PEMFC), based on interrelated electrical and thermal models. The electrical model proposed is based on the integration of the thermodynamic and electrochemical phenomena taking place in the FC whilst the thermal model is established from the FC thermal energy balance. The combination of both models makes it possible to predict the FC voltage, based on the current demanded and the ambient temperature. Furthermore, an experimental characterization is conducted and the parameters for the models associated with the FC electrical and thermal performance are obtained. The models are implemented in Matlab Simulink and validated in a number of operating environments, for steady-state and dynamic modes alike. In turn, the FC models are validated in an actual microgrid operating environment, through the series connection of 4 PEMFC. The simulations of the models precisely and accurately reproduce the FC electrical and thermal performance.

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“…Other authors focus on the porosity of the electrodes through macroscopic studies [56][57][58]. All this research work is of great interest, in order to improve the various FC components.…”

Section: Introductionmentioning

confidence: 99%

Modelling of PEM Fuel Cell Performance: Steady-State and Dynamic Experimental Validation

2014

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“…Impedance due to oxygen transport in the GDL and channel.-In this section, the sign tilde marks dimensionless variables and parameters, defined as [8] and the dimensionless frequency is given by…”

Section: Z Oxmentioning

confidence: 99%

“…Over recent years, a lot of efforts has been done to develop physical models for a PEMFC impedance. [3][4][5][6][7][8][9][10][11][12][13][14] Most of these models are numerical and they are slow to be used in algorithms for spectra fitting. A "faster" alternative is analytical modeling of impedance; [15][16][17][18][19][20][21][22][23] however, fast analytical models have been developed for the case of infinite stoichiometry of the air (oxygen) flow in the cathode channel.…”

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confidence: 99%

A Fast Low-Current Model for Impedance of a PEM Fuel Cell Cathode at Low Air Stoichiometry

Kulikovsky

2017

J. Electrochem. Soc.

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We report a physics-based analytical model for low-current PEM fuel cell impedance, which takes into account oxygen transport in the channel. The model is fast: fitting the model impedance to the experimental Nyquist spectrum takes about 2 minutes on a 2-GHz notebook. In addition to the transport and kinetic parameters of the catalyst layer, fitting returns the oxygen diffusion coefficient in the gas-diffusion layer and the resistivity due to oxygen transport in the channel. Maple worksheet with the fitting procedure is available for download.

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“…The electrode impedance was calculated numerically in their work. Similar numerical impedance model with neglect of the oxygen transport through the CCL depth has been developed by Gerteisen et al 8 It is worth noting that Gerteisen et al assumed that the agglomerates are fully filled with Nafion. In a recent paper, Gerteisen developed a numerical impedance model of the CCL, which includes oxygen transport through the CCL depth and through the Nafion film covering agglomerate.…”

mentioning

confidence: 93%

Can We Quantify Oxygen Transport in the Nafion Film Covering an Agglomerate of Pt/C Particles?

Kulikovsky

2017

J. Electrochem. Soc.

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We report a model of the cathode catalyst layer (CCL) impedance, which includes impedances due to oxygen transport in the Nafion film covering Pt/C agglomerates, and due to oxygen transport through the CCL depth. In the case of small cell current density, analytical solutions for the CCL impedance Z ccl are derived; for larger currents, we analyze numerical solution for Z ccl . The characteristic frequencies of the oxygen transport through the Nafion film and through the CCL depth are close to each other, and the contribution of the Nafion film impedance Z N to Z ccl is small up to the current densities 100 mA cm −2 . This makes it difficult reliable determination of Z N from experimental spectra of a standard 10 μm-thick CCL. However, with the decrease in the CCL thickness, the relative contribution of Z N to Z ccl increases. It gives us a chance to determine Z N by fitting the models of this work to measured spectra of a low-loaded MEA with a thin CCL. An example of fitting the model to a synthetic numerical impedance is given. Polymer electrolyte membrane fuel cells are ready to take their place in the spectrum of electrochemical sources powering the future society. Still, however, a lot needs to be done to improve stability and reduce the cost of these cells. Development of simple and robust ex situ characterization techniques for the fuel cell research and applications (cars, home appliances etc.) is an urgent task.It is generally accepted that the impedance technique gives much more information on a PEM fuel cell, than the DC methods.

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AC impedance modelling study on porous electrodes of proton exchange membrane fuel cells using an agglomerate model

Cited by 54 publications

References 16 publications

Modelling of PEM Fuel Cell Performance: Steady-State and Dynamic Experimental Validation

Modelling of PEM Fuel Cell Performance: Steady-State and Dynamic Experimental Validation

A Fast Low-Current Model for Impedance of a PEM Fuel Cell Cathode at Low Air Stoichiometry

Can We Quantify Oxygen Transport in the Nafion Film Covering an Agglomerate of Pt/C Particles?

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