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CPOTE2020 logo
6th International Conference on
Contemporary Problems of Thermal Engineering
Online | 21-24 September 2020

Abstract CPOTE2020-1138-A

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Prediction of electrochemical characteristics of practical-size solid oxide fuel cells based on database of unit cell performance

Masashi KISHIMOTO, Kyoto University, Japan
Shohei KISHIDA, Kyoto University, Japan
Haewon SEO, Kyoto University, Japan
Hiroshi IWAI, Kyoto University, Japan
Hideo YOSHIDA, Kyoto University, Japan

Numerical model of the solid oxide fuel cells (SOFCs) is developed to reproduce steady-state behavior and the impedance characteristics. One-dimensional model is first developed by considering the conservations of electrons, ions and gas species in the cells. Sinusoidal perturbation with a wide range of frequency is applied to the terminal voltage of the cell as a boundary condition to obtain the electrochemical impedance of the cell. The model is validated by comparing the results with the experimental results obtained from a typical anode-supported button cell. It is confirmed that not only the steady-state performance (current-voltage characteristics) but also the impedance characteristics is accurately reproduced by the model. This indicates the model can correctly estimate the internal resistances of the cells. Then, a quasi-three-dimensional model of practical-scale cells is developed by assuming that the cell consists of multiple one-dimensional unit cell elements. The theoretical expression of the cell current, power output, fuel utilization, conversion efficiency, etc., are constructed and they are calculated by combining the results of the one-dimensional unit cell elements. For this purpose, database is created by calculating a unit cell performance at a wide range of operation conditions.

Keywords: Solid oxide fuel cell (SOFC), Mathematical and numerical models, Impedance, Performance prediction, Hydrogen energy
Acknowledgment: This work was supported under "Fundamental study on rapid evaluation method of SOFC durability" by the New Energy and Industrial Technology Organization (NEDO, Japan).