CO2 electrolysis is not only an effective means of alleviating global warming, but also offers a solution of long-term, large-scale energy storage. Within CO2 electrolysis cell, bipolar plate flow channel is a critical structural characteristic, playing a vital role in the efficient transport of multiphase reactive substances. However, the influence of various flow channel architecture on the performance of CO2 electrolysis remains largely unexplored. In this study, the complex process of multiphase mass transfer coupled with electrochemical reaction within CO2 electrolysis cell was simulated and verified through experiment. Then the influence of various flow channel structures on water-gas transport in the CO2 electrolysis cell was numerically studied. For different flow channel structures, the material distribution across different regions of the cell and the water flooding behaviour are systematically analysed. According to the characteristics of each channel structure, an improved flow channel design is proposed: a multi-serpentine flow channel at the cathode to ensure efficient gas transport capability, and a pin-type flow channel at the anode to reduce the amount of water traversing the membrane. This design aims to prevent cathode flooding while maintaining good gas transport capability. The research provides theoretical guidance for structural optimisation of CO2 electrolysis systems.
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