Preprint

FZJ-2024-01051

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Dynamic lumped cell-level model of chemical membrane degradation in PEM electrolysis: Impact of pressure and time dependence

Dörner, S. ; Kinzl, M. ; Mitsos, A.FZJ*RWTH* ; Bongartz, D. (Corresponding author)

2023

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Please use a persistent id in citations: doi:10.1149/osf.io/ea8qm  doi:10.34734/FZJ-2024-01051

Abstract: Chemical membrane degradation has a significant impact on the lifetime of a PEM electrolyzer. For comprehensive understanding, cell-level models are useful. However, existing cell-level models ignore the dynamic consumption process of Nafion membrane fragments over time and do not consider the influence of operating parameters, such as pressure, on chemical membrane degradation. To address these limitations, we present a dynamic lumped cell-level model to analyze chemical membrane degradation as fluoride release rates. Parameter estimation with experimental literature data is performed using a pseudo-steady state approach. The model is used to investigate the influence of pressure. The results show increased fluoride release rates and H2O2 concentrations at higher pressures due to enhanced O2 crossover. They also suggest that the maximum in degradation rate at intermediate current densities is due to changing water flux across the membrane. Time-dependent simulations with full dynamics suggest that the maximum is reached after several thousand hours.

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Contributing Institute(s):

1. Modellierung von Energiesystemen (IEK-10)

Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)

Appears in the scientific report 2023

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Database coverage:

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