Book/Dissertation / PhD Thesis

FZJ-2026-02073

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Methods for Investigating the Structure-Performance Correlation in Membrane Electrode Assemblies

Utsch, N. (Corresponding author)FZJ*

2026
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-95806-901-5

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Please use a persistent id in citations: urn:nbn:de:0001-2604141110241.442666738673  doi:10.34734/FZJ-2026-02073

Abstract: This work uses proton exchange membrane water electrolyzers as an example to provide a comprehensive understanding of the relationship between catalyst layer morphology, manufacturing processes, and electrochemical performance. Combining microscopy techniques with modern evaluation methods establishes a reliable foundation for characterizing and developing the catalyst layer’s structural and electrical features. The most significant findings underscore the importance of surface texture homogeneity which impact the performance and lifetime of the electrolyzers. This work demonstrates how production parameters such as spray pressure, nozzle spacing, and dispersion formulation influence the morphological and electrochemical properties of catalyst layers. The developed approach enables the evaluation of catalyst layer properties by identifying strong correlations between physical texture descriptors and statistical features derived from image analysis. Using this approach to examine scanning electron microscopy images of catalyst layers provides a quantitative description across the magnification scale. It enables the analysis and objective evaluation of structures in the macroscopic region of the layer, as well as the transition to the catalyst-pore network. Additionally, the development of a novel four-line probe based on industrial printed circuit board technology reliably determines the catalyst layer resistance, overcoming the limitations of conventional methods. Ultimately, this work advances the understanding of the role of catalyst layer morphology in electrochemical systems, paving the way for advancements in the performance, durability, and scalability of water electrolyzers.

Note: Dissertation, RWTH Aachen University, 2025

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Contributing Institute(s):

1. Elektrochemische Verfahrenstechnik (IET-4)

Research Program(s):

1. 1231 - Electrochemistry for Hydrogen (POF4-123) (POF4-123)

Appears in the scientific report 2026

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