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Influence of the Start-Up Procedure on the Performance of Polymer Electrolyte Fuel Cells

Knöri, Torsten (2010) Influence of the Start-Up Procedure on the Performance of Polymer Electrolyte Fuel Cells. In: Proceedings of the 61st Annual Meeting of the International Society of Electrochemistry. International Society of Electrochemistry. 61st Annual Meeting of the International Society of Electrochemistry, 26. Sep. - 01. Okt. 2010, Nizza, Frankreich.

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Abstract

The performance of polymer electrolyte fuel cells (PEFC) depends on many different aspects: Besides the operating parameters, which influences on performance are mainly understood, the history of the fuel cell operation has an essential impact. This fact is reflected in the strong increase of the investigations of degradation processes. During long-term operation, the performance of polymer electrolyte fuel cells shows a continuous descent while the operating conditions remain the same. In an analogous manner, the start-up procedure of fuel cells and the conditioning of their components - especially of the membrane electrode assembly during to the start-up procedure - have also a significant influence on the cell performance, but are frequently neglected in these studies. Therefore, investigations of the start-up procedure, which are comparable to the degradation investigations, are necessary. During the corresponding start-up process the membrane is humidified for enabling a sufficient proton conductivity of the polymer electrolyte. Simultaneously, the first electrochemical operation leads to a closer connection of the different components of the MEA. The DLR has investigated the influence of different start-up procedures on the performance of a PEFC. The MEAs used in these experiments consisted of commercial Nafion membranes and electrodes from ETEK which were pressed together during the assembly of the cells. In this contribution the characterisation of different start-up procedures by in-situ methods like polarization curves and electrochemical impedance spectroscopy (EIS) (at the end of each start-up procedure) will be presented. By means of these investigations two basic results can be proven: In comparison to a constant current at start-up, sequentially alternating operating points with increasing current densities yield higher performance at the end of the procedure. Thereby, an increase of the cell performance is coupled with a reduction of the time requirement for steady-state operation.

Item URL in elib:https://elib.dlr.de/65826/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of the Start-Up Procedure on the Performance of Polymer Electrolyte Fuel Cells
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knöri, Torstentorsten.knoeri (at) dlr.deUNSPECIFIED
Date:26 September 2010
Journal or Publication Title:Proceedings of the 61st Annual Meeting of the International Society of Electrochemistry
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
UNSPECIFIEDInternational Society of Electrochemistry
Publisher:International Society of Electrochemistry
Status:Published
Keywords:Fuel Cell, PEM, Start-Up
Event Title:61st Annual Meeting of the International Society of Electrochemistry
Event Location:Nizza, Frankreich
Event Type:international Conference
Event Dates:26. Sep. - 01. Okt. 2010
Organizer:International Society of Electrochemistry
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E BZ - Fuel cells (old)
DLR - Research area:Energy
DLR - Program:E BZ - Fuel cells
DLR - Research theme (Project):E - Membran-Brennstoffzellen (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Knöri, Torsten
Deposited On:02 Nov 2010 11:26
Last Modified:23 Feb 2011 12:11

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