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LiF@PFSA-Based Composite Membranes for PEM Fuel Cells at Intermediate Temperature Conditions

Title data

Kutter, Maximilian ; Hilgert, Annika ; Maier, Maximilian ; Schilling, Monja ; Greve, Christopher ; Loukrakpam, Rameshwori ; Hagemeier, Wiebke ; Rosin, Andreas ; Muggli, Mark ; Herzig, Eva M. ; Zeis, Roswitha ; Böhm, Thomas ; Gerdes, Thorsten ; Roth, Christina:
LiF@PFSA-Based Composite Membranes for PEM Fuel Cells at Intermediate Temperature Conditions.
In: ACS Applied Polymer Materials. (2025) .
ISSN 2637-6105
DOI: https://doi.org/10.1021/acsapm.4c02540

Official URL: Volltext

Project information

Project title:
Project's official title
Project's id
HyRunCell
No information
CRC 1585 "MultiTrans" - Project B03 & C02
492723217
solar technologies go hybrid
No information

Project financing: Bayerisches Staatsministerium für Wissenschaft, Forschung und Kunst
Deutsche Forschungsgemeinschaft
Andere
Bayerisches Staatsministerium für Wirtschaft, Landesentwicklung und Energie
Fonds der Chemischen Industrie

Abstract in another language

Polymer electrolyte membrane fuel cells (PEMFCs) operating at temperatures above 100 °C offer an interesting opportunity for heavy-duty applications. Especially for intermediate operating temperatures between 110 and 130 °C (IT-PEMFC), faster reaction kinetics, higher tolerance to fuel impurities, and water flooding as well as improved heat management of the fuel cell system have been observed. Perfluorosulfonic acid-based membranes (PFSAs) can be modified by incorporating additives or (nano)particle filler systems to improve their thermal and mechanical stability, proton conductivity, and long-term performance at these increased temperatures. Here, we investigate the effect of lithium fluoride particles embedded in PFSA membranes on their water retention behavior as well as on membrane durability in single-cell tests at elevated PEMFC operating temperatures of up to 120 °C. The lithium fluoride nanoparticle-modified membrane shows increased cell performance under both standard and intermediate temperature conditions. The observed performance boost can be explained by an increased mechanical stability at elevated temperatures of the membrane, due to stabilizing hydrophobic and hydrophilic domains, and an increased water uptake and storage capability, especially at low humidity levels during full cell operation. We propose that the nanoparticles adsorb water molecules by hydrogen bond formation, thus enhancing proton conductivity even at high temperatures resulting in these increased full cell performances of the LiF@PFSA-based composite membrane.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: composite membranes; metal fluorides; intermediate temperature PEM fuel cells; in situ Raman; SAXS study; water retention
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics VII - Dynamics and Structure Formation > Professor Experimental Physics VII - Dynamics and Structure Formation - Univ.-Prof. Dr. Eva M. Herzig
Faculties > Faculty of Engineering Science > Chair Electrochemical Process Engineering > Chair Electrochemical Process Engineering - Univ.-Prof. Dr.-Ing. Christina Roth
Research Institutions > Research Units > Keylab Glass Technology
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 14 Jan 2025 07:33
Last Modified: 14 Jan 2025 09:31
URI: https://eref.uni-bayreuth.de/id/eprint/91559