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Improving long-term solid oxide fuel cell stack performance prediction accuracy using a microstructure evolution model
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DOI：10.1016/j.jpowsour.2023.233368.png)
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Abstract
En 中文
Solid oxide fuel cells (SOFCs) are highly efficient energy conversion devices capable of utilizing a wide range of fuels. However, a variety of degradation phenomena affects their long-term performance and durability. The purpose of this study is to explain an increase in voltage of an SOFC stack observed during a 3800 h-long period of operation. A three-dimensional phase field model using focused ion beam scanning electron microscopy data as initial input is used to simulate the evolution of an SOFC microstructure over a period of prolonged operation. For the generated time steps, microstructure parameters are obtained, and a microstructure-scale mass and charge transport model is used to predict the voltage change. The microstructure evolution model, combined with the electrochemical performance model, predicts the 0.01 V increase in terminal voltage during the 3800-long period of operation, which is consistent with the experimental results. The behavior is predicted for various phase mobility ratios, suggesting that the phenomenon is related to the specific characteristics of the particular microstructure investigated in the study. Clearing of diffusion pathways is identified as the root cause of the performance enhancement. Additionally, the results suggest non-negligible changes in the ceramic phase within the electrode.
Keywords:
Solid oxide fuel cell
Degradation
Phase field model
Focused ion beam scanning electron
microscopy
Microstructure
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7.9
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3.7W
Citations:
15.0W
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