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Abstract
The gas diffusion layer (GDL) stands as one of the pivotal components within the membrane electrolyte assembly of Polymer Electrolyte Fuel Cells (PEFCs). It plays multifaceted roles, including facilitating the diffusion of reactant gases, providing essential electrical conductivity, and ensuring mechanical stability within the PEFC system. The GDL consists of a macroporous substrate (MPS) and a microporous layer (MPL) [1]. Conventionally, both layers undergo treatment with polytetrafluoroethylene (PTFE) to achieve the necessary hydrophobicity for effective water management [2]. The degradation of the GDL, marked by phenomena such as carbon corrosion and PTFE loss, can substantially compromise critical aspects of PEFC operation, including water management, electrical conductivity, and mass transport [3]. Given these considerations, attaining a comprehensive understanding of the degradation mechanisms is imperative. In this study, we subjected a commercially available GDL to rigorous accelerated stress testing using various oxidative media, including water, hydrogen peroxide (H2O2), and Fenton's reagent, each exposure lasting 24 hours. The analysis encompassed investigations into hydrophobic properties, employing techniques such as contact angle measurements, thermogravimetry, and energy-dispersive X-ray spectroscopy(EDX). Elemental composition variations, as elucidated by EDX analysis (Figure 1), unveiled degradation of PTFE components, following exposure to H2O2 and the Fenton reagent. These findings underscore the susceptibility of the MPS side of the GDL to oxidative stress, resulting in changes in wetting behavior, increased weight loss, and PTFE component degradation. Conversely, the MPL side exhibited superior stability and resistance to oxidative degradation. This investigation underscores the necessity of discerning the distinct behavior between the MPS and MPL sides, shedding light on crucial considerations for PEFC applications.
ACKNOWLEDGMENT
This research work is performed under the project AlpeDHues which is supported by the Austrian Research Promotion Agency (FFG).
REFERENCES
[1]. C. Csoklich, R. Steim, F. Marone, T. Schmidt and F. Büchi, ACS Applied Materials & Interfaces, 13, 9908–9918 (2021).
[2]. A. Ozden, S. Shahgaldi, X. Li and F. Hamdullahpur, Progress in Energy and Combustion Science, 74, 50–102 (2019).
[3]. Y. Yang, X. Zhou, B. Li and C. Zhang, Applied Energy, 303, 117688 (2021).
ACKNOWLEDGMENT
This research work is performed under the project AlpeDHues which is supported by the Austrian Research Promotion Agency (FFG).
REFERENCES
[1]. C. Csoklich, R. Steim, F. Marone, T. Schmidt and F. Büchi, ACS Applied Materials & Interfaces, 13, 9908–9918 (2021).
[2]. A. Ozden, S. Shahgaldi, X. Li and F. Hamdullahpur, Progress in Energy and Combustion Science, 74, 50–102 (2019).
[3]. Y. Yang, X. Zhou, B. Li and C. Zhang, Applied Energy, 303, 117688 (2021).
Originalsprache | englisch |
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Publikationsstatus | Veröffentlicht - 11 Dez. 2023 |
Veranstaltung | World Fuel Cell Conference 2023 - Imperial College London, London, Großbritannien / Vereinigtes Königreich Dauer: 11 Dez. 2023 → 13 Dez. 2023 |
Konferenz
Konferenz | World Fuel Cell Conference 2023 |
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Kurztitel | WFCC23 |
Land/Gebiet | Großbritannien / Vereinigtes Königreich |
Ort | London |
Zeitraum | 11/12/23 → 13/12/23 |
Fields of Expertise
- Mobility & Production
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AlpeDHues - Alterungsanalyse und Performanceoptimierung von Brennstoffzellen im hochdynamischen Betrieb
Bodner, M., Hacker, V. & Edjokola, J. M.
1/01/22 → 30/06/25
Projekt: Forschungsprojekt