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A Pathway towards Pt-free Cathodes in High-Temperature Proton Exchange Membrane Fuel Cells

Müller-Hülstede, Julia and Uhlig, Lisa Maria and Schmies, Henrike and Schonvogel, Dana and Wagner, Peter (2023) A Pathway towards Pt-free Cathodes in High-Temperature Proton Exchange Membrane Fuel Cells. Ulm Electro Chemical Talks UECT, 14.-15. Juni 2023, Ulm, Deutschland.

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The high temperature proton exchange membrane fuel cell (HT-PEMFC) has several advantages compared to its low temperature (LT) counterpart. The typical operation temperature of 160 °C enables an easier heat management, and the omission of humidification. However, due to the partial blocking of the cathodic and anodic Pt catalyst by phosphates from the phosphoric acid-doped membrane, higher catalyst loadings compared to LT-PEMFC of 0.86 mgPt cm-2 per electrode are commonly employed.[1] To increase the competitiveness of HT-PEMFCs implementation of Fe-N-Cs is a promising option for reduction of catalyst costs. In this study, we give an overview about the application of different Fe-N-C catalysts in Pt free HT-PEMFC cathodes.[2] Moreover, we show their application in hybrid PtNi/C+Fe N C cathodes.[1] The complete replacement of Pt catalyst by Fe N C in the cathode results in low performance[2] and a strong voltage decay within the first 60 hours of HT-PEMFC operation. In contrast, a hybrid MEA with reduced Pt-loading displayed a more comparable performance to commercial MEA (Celtec®-P1200) and constant voltage over 60 h. Furthermore, it was found that the typical activation procedure of HT-PEMFC MEAs (around 60 h constant load) is not sufficient for hybrid MEAs. There, a voltage increase over the first 240 h of operation was observed.[1] These results give the basis for further optimization of Pt-free Fe N C electrodes. Furthermore, the potential of hybrid MEAs for Pt-loading reduction in HT-PEMFC is pointed out.

Item URL in elib:https://elib.dlr.de/195555/
Document Type:Conference or Workshop Item (Poster)
Title:A Pathway towards Pt-free Cathodes in High-Temperature Proton Exchange Membrane Fuel Cells
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Müller-Hülstede, JuliaUNSPECIFIEDhttps://orcid.org/0000-0001-7822-8425UNSPECIFIED
Schmies, HenrikeUNSPECIFIEDhttps://orcid.org/0000-0002-6565-1280UNSPECIFIED
Schonvogel, DanaUNSPECIFIEDhttps://orcid.org/0000-0002-2485-740XUNSPECIFIED
Wagner, PeterUNSPECIFIEDhttps://orcid.org/0000-0002-5644-9881UNSPECIFIED
Date:June 2023
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Fe-N-C; ORR, HT-PEMFC; MEA; Stability
Event Title:Ulm Electro Chemical Talks UECT
Event Location:Ulm, Deutschland
Event Type:national Conference
Event Dates:14.-15. Juni 2023
Organizer:Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW)
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Materials for Electrochemical Energy Storage
Location: Oldenburg
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Müller-Hülstede, Julia
Deposited On:30 Jun 2023 14:06
Last Modified:30 Jun 2023 14:06

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