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Modelling of PEMFC Cold Starts

Gießgen, Tom and Jahnke, Thomas (2021) Modelling of PEMFC Cold Starts. EFCF 2021, 29. Juni - 2. Juli 2021, Lucerne, Switzerland (online).

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Abstract

One challenge for the automotive application of polymer electrolyte fuel cells (PEMFC) is the start-up with sub-zero temperatures due to the reezing of water inside the cell. The temperature has to rise above 0 °C before the ice completely blocks the cathode pores and inhibits the oxygen reduction and species transportation. A transient 2D numerical model is presented to better understand the influence of start-up and design parameters and to propose efficient cold start strategies. This includes the drying of the membrane prior to shut-down as demonstrated with the simulation of a cycle of: normal operation, drying, cooling down, cold start, normal operation. Other beneficial factors for a successful cold start are thermal insulation and low cell voltage for the potentiostatic mode (Fig. 1). It is also shown that a temperature of 0 °C measured at the cathode bipolar plate might not be a sufficient criterion for a successful cold start due to the remaining ice in the cathode catalyst and microporous layer and the inhomogeneous temperature profile along the channel direction.

Item URL in elib:https://elib.dlr.de/147049/
Document Type:Conference or Workshop Item (Poster)
Title:Modelling of PEMFC Cold Starts
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gießgen, TomTom.Giessgen (at) dlr.dehttps://orcid.org/0000-0002-2325-0163
Jahnke, ThomasThomas.Jahnke (at) dlr.dehttps://orcid.org/0000-0003-2286-6801
Date:2021
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:PEMFC, Simulation, Kaltstart, cold start
Event Title:EFCF 2021
Event Location:Lucerne, Switzerland (online)
Event Type:international Conference
Event Dates:29. Juni - 2. Juli 2021
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - NGC Antriebssystem und Energiemanagement
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Gießgen, Tom
Deposited On:21 Dec 2021 10:28
Last Modified:21 Dec 2021 10:28

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