Statistical Simulation of the Performance and Degradation of a PEMFC Membrane Electrode Assembly Page: 4 of 8
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ECS Transactions, 50 (2) 147-154 (2012)
Table 1: Statistical variation on Input Parameters
Component Properties % Deviation (1 Std Dev)
Catalyst/Catalyst Layer
Thickness (microns) +/- 8%
Weight Ratios (%)
Pt:C +/- 1%
(Pt:C):Ionomer +/- 1%
Pt Loading [mg/cmA2] +/- 5 %
Pt size +/- 10%
Tafel Slope [mV/dec] fixed
Jo [A/cm^2 t] +/- 10%
GDL
Porosity fixed
Tortuosity +/- 3%
Thickness +/- 5%
Membrane
Thickness +/- 2%Results and Discussion
The model was used to simulate the performance and statistical variation in 20 baseline
MEAs of similar composition. From Figure 4, it can clearly be seen that there exists a
combination of part-to-part variations that result in an increased sensitivity and,
subsequently, lower cell voltages at the higher current densities. Overall, the model
shows the capability to capture both the average performance and distribution in the
performance of the unit cell on a MEA-to-MEA basis, provided the variations of the
MEA characteristics are known.
I.
-MF'odel Avrg
,. - Model Upper 95%
Q - " nta average
Exp Lner 9 5%
-Experimental Upper 95 Wn(U
00.4
0.2Figure 4 Validation
baseline MEA.0 200 400 600 800 1000 1200 1400 1600 1800
Current density (mA/cm2)
of the Performance Model based on the statistical simulation of theFollowing the statistical validation using the baseline MEA, the model was used to study
the effect of platinum loading reductions from 0.5 - 0.05 mg/cm2. In Figure 5, the model
shows the capability to capture the effect of the Pt loading reductions, in particular the
ability to describe the changes in the reaction penetration into the catalyst layer due to
changes in proton penetration, oxygen transport, and liquid water content. Further, in
Figure 5, it is also seen that the model adequately captured the increased sensitivity to
oxygen partial pressure seen at lower platinum loadings. The model results, shown in
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Harvey, David; Bellemare-Davis, Alexander; Karan, Kunal; Jayansankar, Barath; Pharoah, Jon; Colbow, Vesna et al. Statistical Simulation of the Performance and Degradation of a PEMFC Membrane Electrode Assembly, article, July 1, 2012; United States. (https://digital.library.unt.edu/ark:/67531/metadc841899/m1/4/: accessed May 10, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.