Book/Dissertation / PhD Thesis

FZJ-2025-00987

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Integration of a rib-channel design to improve air-side contacting in solid oxide cell (SOC) stacks

Ayhan, Y. S. (Corresponding author)FZJ*

2024
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-95806-797-4

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Please use a persistent id in citations: urn:nbn:de:0001-2501281150356.973657649657  doi:10.34734/FZJ-2025-00987

Abstract: Energy transition worldwide can be realized with the contribution of promising and advanced technologies such as solid oxide cells (SOCs). Although commercial products are on the market, this ceramic-based technology can still be improved to increase both operating efficiency and lifetime, and reduce the cost of the end product. Non-optimal air-side contacting in SOC stacks causes performance loss compared to single-cell measurements and may be avoided by a novel design, which is the direct printing of an air-side electrode contact layer in a rib-channel form. This ceramic layer also provides gas distribution, eliminating the need for machined or stamped gas channels on the metallic interconnect. Since the machining/pressing process is costly and time-consuming, printing this ceramic layer with a novel design might be advantageous in terms of performance enhancement and cost-effectiveness in SOC stacks. To realize the novel idea, stencil printing was used to print ribs from pastes with different recipes and preparation routes. Two different perovskite materials, developed and used in-house, were utilized in the paste preparation. It is observed that changing solid content and binder content by keeping the type of ingredients and the particle size distribution (PSD) within the paste batch the same did not change the rheological behavior. It has been observed that the reason was the lack of a three-dimensional (3D) network within the paste structure which provides structural recovery after the printing. It led to an undesired shape on the printed design because the paste flows and does not retain its printed shape. However, by adding a dispersant and varying the PSD of the powders, the pastes became more controllable, and the influence was directly seen in the shape of printed ribs with sharper edges and flatter surfaces. In addition, rheology results were applied to the printing process to achieve successful printing results, i.e. a delay before separation of the substrate from the stencil was applied according to the timedependent behavior plot obtained from rheology measurements. Thus, ribs with a thickness of about 500 μm with an appropriate surface flatness were successfully printed and characterized by electron microscopy, 3D confocal microscopy, and white light topography. As an outlook, the best-performing design, microstructure, and material combination for the rib-channel form will be investigated. In addition, a stack test consisting of cells with this rib-channel design of the cathode contact layer will be performed and evaluated.

Note: Dissertation, RWTH Aachen University, 2024

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IMD-2)

Research Program(s):

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

Appears in the scientific report 2024

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