Investigation of Overpotential Distributions in a Solid Oxide Electrolysis Cell using Experimental and Modeling Approaches
Author
Term
4. term
Education
Publication year
2025
Submitted on
2025-05-27
Pages
93
Abstract
This thesis investigates the distribution of overpotentials in a solid oxide cell using both experimental and modeling methods. A 3D finite element model is employed in COMSOL Multiphysics to simulate electrochemical, thermal, and transport phenomena. Experimental validation includes \textit{I/U} curve measurements, electrochemical impedance spectroscopy, and gas composition analysis via mass spectrometry. The model shows good agreement with experiments and is able to capture variations in overpotentials along the cell. Electrolysis operation at thermoneutral voltage is studied in detail with the model to evaluate overpotentials and local heat sources and sinks. The results highlight the importance of spatially resolved modeling in understanding and optimizing solid oxide cell performance. The model enables detailed analysis of current density distribution, local overpotential behavior, and heat source contributions. Combined with experimental data, it provides a valuable tool for evaluating operating strategies and guiding design improvements in high-temperature electrolysis systems.
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