Journal Article

FZJ-2021-00838

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png PEM fuel cell distribution of relaxation times: a method for the calculation and behavior of an oxygen transport peak

Kulikovsky, A. (Corresponding author)FZJ*

2020
RSC Publ. Cambridge

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Please use a persistent id in citations: http://hdl.handle.net/2128/27119  doi:10.1039/D0CP02094J

Abstract: A simple numerical method for the calculation of the distribution of relaxation times (DRT) for PEM fuel cell impedance is developed. The method combines the Tikhonov regularization technique and projected gradient iterations. The method is illustrated by calculating DRT for the synthetic impedance of two parallel RC-circuits and for Warburg finite-length impedance. Finally, cathode catalyst layer (CCL) impedance is calculated using the exact analytical solution and the method discussed is applied to understand the behavior of the DRT peak due to oxygen transport in the CCL. The position of the oxygen transport peak on the frequency scale exhibits non-monotonic behavior as the oxygen diffusion coefficient in the CCL decreases, which may serve as an indicator of CCL flooding. The Python code for DRT calculation is available for download.

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Contributing Institute(s):

1. Elektrochemische Verfahrenstechnik (IEK-14)

Research Program(s):

1. 135 - Fuel Cells (POF3-135) (POF3-135)

Appears in the scientific report 2021

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Database coverage:
; ; Allianz-Lizenz / DFG ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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