Optimization of physical parameters of solid oxide fuel cell electrode using electrochemical model |
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Authors: | Dong Hyun Jo Jeong Hwan Chun Ki Tae Park Ji Won Hwang Jeong Yong Lee Hyun Wook Jung Sung Hyun Kim |
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Affiliation: | (1) Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku Fukuoka, 819-0395, Japan;(2) Environmental Technology Research Division, INAMORI Frontier Research Center, Kyushu University, 744 Motooka, Nishi-ku Fukuoka, 819-0395, Japan;(3) Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi-ku Fukuoka, 819-0395, Japan;(4) Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku Sendai, 980-8577, Japan;(5) Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-02, Aramaki Aza Aoba, Aoba-ku Sendai, 980-8579, Japan |
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Abstract: | To enhance the performance of anode-supported solid oxide fuel cell (SOFC), an electrochemical model has been developed in
this study. The Butler-Volmer equation, Ohm’s law and dusty-gas model are incorporated to predict the activation, ohmic and
concentration overpotentials, respectively. The optimal cell microstructure and operating parameters for the best current-voltage
(J-V) characteristics have been sought from the information of the exchange current density and gas diffusion coefficients.
As the cell temperature rises, the activation and ohmic overpotentials decrease, whereas the concentration overpotential increases
due to the considerable reduction of gas density at the elevated temperature despite the increased diffusion coefficient.
Also, increasing the hydrogen molar fraction and operating pressure can further augment the maximum cell output. Since there
exists an optimum electrode pore size and porosity for maximum cell power density, the graded electrode has newly been designed
to effectively reduce both the activation and concentration overpotentials. The results exhibit 70% improved cell performance
than the case with a non-graded electrode. This electrochemical model will be useful to simply understand overpotential features
and devise the strategy for optimal cell design in SOFC systems. |
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