Abstract
In this work, the three-dimensional (3-D) microstructure of Solid Oxide Fuel Cell (SOFC) composite electrode is reconstructed by a random particle packing procedure and a geometrical dilating process, based on which the different tortuosity factors (τ) are calculated by solving the steady state charge conservation equation in different percolated networks. After that, the effects of the different τ on cell performance are analyzed by a one-dimensional (1-D) SOFC performance simulation model, in which the electrochemical reactions and the gas/ion/electron transport are coupled. The results indicate that the tortuosity factor of the ion-conducting phase in SOFC cathode (τio,c) plays the most important role and up to 62% SOFC performance improvement can be expected by decreasing τio,c. In addition, by decreasing the tortuosity factor of the gas phase (τgas,a) and the ion-conducting phase in SOFC anode (τio,a), 1.7% and 17% performance improvement can be achieved, respectively. This work could help improving SOFC performance by modifying the tortuous transport paths in SOFC porous electrodes.
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