Abstract
Compared with planar-type solid oxide fuel cells (SOFCs), mono-block-layer build (MOLB)-type SOFCs have additional three-phase boundaries per unit volume, and their performance is severely limited by their longer current path. To resolve this issue, a vertical rib design, which was evaluated using a numerical method, was proposed. Compared with the conventional design, the power density for the vertical rib design increased by 12.32%. This is because the vertical rib design provides another short path for current, which not only reduces the ohmic loss in the cathode, but also decreases the ohmic polarization caused by the contact resistance. However, the vertical rib design hinders the transport of oxygen in the cathode and increases the concentration loss. Therefore, the vertical rib size design is crucial. Based on the influence of the vertical rib width, the vertical rib widths on the cathode and anode sides of 0.7 and 1 mm are recommended for different contact resistances, respectively.
Highlights
Fuel cells have attracted widespread attention from international scholars owing to their high efficiency, cleanliness, and quietness [1,2,3,4]
The results show that the power density for the vertical rib design is
To reduce the ohmic polarization of mono-block-layer build (MOLB)-type solid oxide fuel cells (SOFCs), a vertical rib design wa proposed in this study
Summary
Fuel cells have attracted widespread attention from international scholars owing to their high efficiency, cleanliness, and quietness [1,2,3,4]. PEMFCs use precious metals as catalysts, which increases the production costs. High-purity hydrogen is required, and the storage and transportation of hydrogen is a major problem, which hinders the commercial application of PEMFCs [5,6,7]. Compared with the PEMFCs, solid oxide fuel cells (SOFCs) can use non-noble metals as catalysts because of their higher operating temperatures (873.15–1073.15 K). Owing to its corrugated anode/electrolyte/cathode, the MOLB-type type SOFC increases the total length of the three-phase boundaries and reduces the activation polarization, while the corrugated anode/electrolyte/cathode provides the fuel and air flow channel, eliminating the interconnector channel and making the SOFC more compact [16]
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