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Tolerance and Recovery of Ultralow-Loaded Platinum Anode Electrodes upon Carbon Monoxide and Hydrogen Sulfide Exposure

Prass, Sebastian und Friedrich, Kaspar Andreas und Zamel, Nada (2019) Tolerance and Recovery of Ultralow-Loaded Platinum Anode Electrodes upon Carbon Monoxide and Hydrogen Sulfide Exposure. Molecules, 24, Seiten 3514-3528. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/molecules24193514. ISSN 1420-3049.

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Kurzfassung

The effects of carbon monoxide (CO) and hydrogen sulfide (H2S) in concentrations close to their respective limits in the Hydrogen Quality Standard ISO 14687-2:2012 on the performance of proton exchange membrane fuel cells (PEMFCs) with ultralow-loaded platinum anode catalyst layers (CLs) were investigated. The anodic loadings were 50, 25, and 15 µg/cm², which represent the current state-of-the-art, target, and stretch target, respectively, for future automotive PEMFCs. Additionally, the effect of shut-down and start-up (SD/SU) processes on recovery from sulfur poisoning was investigated. CO at an ISO concentration of 0.2 ppm caused severe voltage losses of ~40–50% for ultralow-loaded anode CLs. When H2S was in the fuel, these anode CLs exhibited both a nonlinear decrease in tolerance toward sulfur and an improved self-recovery during shut-down and start-up (SD/SU) processes. This observation was hypothesized to have resulted from the decrease in the ratio between CL thickness and geometric cell area, as interfacial effects of water in the pores increasingly impacted the performance of ultrathin CLs. The results indicate that during the next discussions on the Hydrogen Quality Standard, a reduction in the CO limit could be a reasonable alternative considering future PEMFC anodic loadings, while the H2S limit might not require modification.

elib-URL des Eintrags:https://elib.dlr.de/133206/
Dokumentart:Zeitschriftenbeitrag
Titel:Tolerance and Recovery of Ultralow-Loaded Platinum Anode Electrodes upon Carbon Monoxide and Hydrogen Sulfide Exposure
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Prass, Sebastiansebastian.prass (at) ise.fraunhofer.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Friedrich, Kaspar AndreasAndreas.Friedrich (at) dlr.dehttps://orcid.org/0000-0002-2968-5029NICHT SPEZIFIZIERT
Zamel, NadaFraunhofer ISENICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2019
Erschienen in:Molecules
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:24
DOI:10.3390/molecules24193514
Seitenbereich:Seiten 3514-3528
Verlag:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:1420-3049
Status:veröffentlicht
Stichwörter:fuel impurities; ISO concentration; ultralow-loaded anode catalyst layer; platinum electrode; shut-down and start-up process
HGF - Forschungsbereich:Energie
HGF - Programm:Speicher und vernetzte Infrastrukturen
HGF - Programmthema:Brennstoffzellen
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SP - Energiespeicher
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Prozesse (Brennstoffzellen) (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Friedrich, Prof.Dr. Kaspar Andreas
Hinterlegt am:07 Jan 2020 11:16
Letzte Änderung:07 Jan 2020 11:16

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