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Title: Analysis and extension of a PEMFC model
Authors : Piotrowski, Joseph
Häffelin, Andreas
Vetter, Roman
Schumacher, Jürgen
Conference details: 15th Symposium on Modeling and Experimental Validation of Electrochemical Energy Devices (ModVal 2018)
Editors of the parent work: Berg, Erik
Büchi, Felix
Eller, Jens
Gubler, Lorenz
Publisher / Ed. Institution : Paul Scherrer Institut
Publisher / Ed. Institution: Villigen
Issue Date: 12-Apr-2018
License (according to publishing contract) : Not specified
Type of review: Editorial review
Language : English
Subject (DDC) : 621.04: Energy engineering
Abstract: A stationary, macro-homogeneous 1D through-plane model of a membrane electrode assembly (MEA) has been developed by Vetter and Schumacher [1]. In this work, a sensitivity analysis for various parameters of this MEA model is carried out. 48 parameters are identified that impact the model behaviour through the parameterization of transport properties, electrochemistry and through operating conditions. All parameters have been varied over a decade and compared to the initial value to study the impact on the simulated I-V characteristic. If the variation outranged physically reasonable limits, the latter are applied as variation boundaries. In Fig.1 the variation of the electrical conductivity of the GDL sigma_e is shown as exemplary simulation result. The value is varied between 130 and 1300 S/m to account for data of different products types, e.g. from SGL Carbon [2], Toray [3], Freudenberg [4] and Ballard [5]. Fig.1 (a) depicts the polarisation curve with cell voltage U in V plotted over the current density i in A/cm². Two reference points at static cell voltages of Uref = 0.8 V with iref = 0.3 A/cm² (partial load) and Uref = 0.6 V with iref = 2.3 A/cm² (full load) are used in order to evaluate the specific parameter sensitivity. The colour legend depicts the varied parameter values. It can be seen that a higher electrical conductivity leads to a higher current density at equal cell voltage. In Fig.1 (b), the relative deviation of the current density at static cell voltage CCD = (i-iref)/iref is plotted over the varied parameter range. Passing the 0-line indicates passing the default parameter value. Thus, positive deviation stands for an increase and negative deviation for a decrease in performance. The relative deviation at 0.6 V reaches from -0.1 to 0.2, indicating a high sensitivity of the model to sigma_e at full load operation. For partial load conditions, the influence of sigma_e is lower than at full load, as expected from the domination of activation losses over ohmic losses at low current densities. 1. R. Vetter, J. O. Schumacher. Free open reference implementation of a two-phase PEM fuel cell model. Manuscript in preparation for Computer Physics Communications 2. SIGRACET® Gas Diffusion Layers for PEM Fuel Cells, Electrolyzers and Batteries. White Paper. SGL CARBON GmbH. Aug. 2016. 3. Toray Carbon Fiber Paper TGP-H. Technical Data. Accessed: 12. February 2018. FUEL CELL Store. 4. Freudenberg Gas Diffusion Layers for PEMFC DMFC. Technical Data. Freudenberg. Dec. 2014. 5. AvCarb Gas Diffusion Systems for Fuel Cells. Technical Data. AvCarb. Feb. 2013.
Departement: School of Engineering
Publication type: Conference Poster
DOI : 10.3929/ethz-b-000240521
Appears in Collections:Publikationen School of Engineering

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