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Investigation of Current Density Distributions of PEM Fuel Cells during Cold Start-up

Friedrich, K. Andreas und Rui, Lin und Garcia Sanchez, Daniel und Gülzow, Erich (2013) Investigation of Current Density Distributions of PEM Fuel Cells during Cold Start-up. Meeting of the International Society of Electrochemistry 2013, 2013-09-09 - 2013-09-13, Queretaro, Mexico.

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Kurzfassung

The possibility to start-up polymer fuel cells from freezing temperatures is an essential requirement of the automotive application for fuel cell power trains. Even though car manufacturers have found a practical solution to the cold start issue by purging and thereby drying the cells during shut down - thereby avoiding strong degradation by ice formation in gas diffusion layers and flow fields - not much is known about the electrochemical processes during cold start-up. This is however required to avoid gradual degradation and life-time limitations. In this study we investigate the current density distribution of a stack during the start-up from -20 °C. A short stack is exposed at freezing temperatures and investigated in during start-up in a fuel cell test station with segmented sensor plates. Before freezing the cells are dryed (see Figure 1). The found heterogeneities are correlated with integral polarization and cell resistance tests at different flow conditions. Furthermore, cyclic voltammetry (CV) and electrochemical impedance spectra (EIS) provide some additional information about the changes during the start-up after freezing conditions. In addition we investigate the microscopic conductivity distribution of Nafion® membranes by conductive atomic force microscopy at freezing temperatures below -15 °C. The conductivity structure is correlated with extensive investigations available at elevated temperatures. The implications for start-up procedures will be shortly discussed.

elib-URL des Eintrags:https://elib.dlr.de/85711/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Investigation of Current Density Distributions of PEM Fuel Cells during Cold Start-up
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Friedrich, K. Andreasandreas.friedrich (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Rui, LinTongji UniversityNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Garcia Sanchez, DanielDaniel.GarciaSanchez (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Gülzow, Ericherich.guelzow (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:10 September 2013
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:cold start Polymer electrolyte fuel cell
Veranstaltungstitel:Meeting of the International Society of Electrochemistry 2013
Veranstaltungsort:Queretaro, Mexico
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:9 September 2013
Veranstaltungsende:13 September 2013
Veranstalter :International Society of Electrochemistry
HGF - Forschungsbereich:Energie
HGF - Programm:Rationelle Energieumwandlung und Nutzung (alt)
HGF - Programmthema:Brennstoffzelle (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E EV - Energieverfahrenstechnik
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Prozesse (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Friedrich, Prof.Dr. Kaspar Andreas
Hinterlegt am:26 Nov 2013 10:34
Letzte Änderung:24 Apr 2024 19:51

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