Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
DOI: https://doi.org/10.29363/nanoge.matsusfall.2024.018
Publication date: 28th August 2024
Zero-gap membrane electrode-based CO/CO2 electrolysis, powered by renewable energy sources, presents a promising avenue for achieving sustainable production of key building-block chemicals, including ethanol and ethylene. Nevertheless, achieving the capability to operate at industrially relevant current densities exceeding 200 mA/cm² and maintaining stable performance for extended periods up to 1000 hours demands substantial further development and understanding.
This presentation will focus on the application of in-operando X-ray technology to elucidate degradation mechanisms within a zero-gap membrane electrode CO/CO₂ electrolysis system. [1-3] In the context of CO₂ electrolysis, the transport mechanisms of cations and water inside a membrane electrode assembly during operation will be discussed. The dynamic behavior of cations and water is linked to flooding issues and salt precipitation in the gas diffusion layer (GDL), which leads to performance degradation. [1-2] For CO electrolysis, our findings reveal that GDL flooding, the potential presence of metal contaminants at the cathode, and the anodic oxidation of liquid products at the anode cause changes in selectivity during long-term stability tests.[3] Some appropriate strategies are demonstrated to mitigate some of these issues.
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