Journal Article

FZJ-2018-04553

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Two States of the Cathode Catalyst Layer Operation in a PEM Fuel Cell

Reshetenko, T. ; Kulikovsky, A. (Corresponding author)FZJ*

2018
Electrochemical Soc. Pennington, NJ

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Please use a persistent id in citations: http://hdl.handle.net/2128/19455  doi:10.1149/2.0541810jes

Abstract: We measure impedance of a standard Pt/C–based PEM fuel cell for a series of current densities from 50 to 400 mA cm− 2. Using our recent model for extraction of spatially–resolved data from impedance spectra, we plot the dependence of the oxygen diffusion coefficient Dox in the cathode catalyst layer (CCL) and Db in the gas–diffusion layer (GDL) on the distance along the cathode channel. While the GDL oxygen diffusivity is fairly uniform over the cell active area, the shape of Dox indicates that the cell is separated into two domains with high and low water contents in the CCL. We attribute this effect to the positive feedback loop between the rates of oxygen transport and liquid water evaporation in the CCL, leading to local CCL flooding.

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Contributing Institute(s):

1. Elektrochemische Verfahrenstechnik (IEK-3)

Research Program(s):

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

Appears in the scientific report 2018

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Database coverage:
; ; ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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