A Simple Expression for the Tortuosity of Gas Transport Paths in Solid Oxide Fuel Cells’ Porous Electrodes

Wei Kong, Qiang Zhang, Xiuwen Xu and Daifen Chen
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Wei Kong: School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Qiang Zhang: School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Xiuwen Xu: School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Daifen Chen: School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China

Energies, 2015, vol. 8, issue 12, 1-7

Abstract: Based on the three-dimensional (3D) cube packing model, a simple expression for the tortuosity of gas transport paths in solid oxide fuel cells’ (SOFC) porous electrodes is developed. The proposed tortuosity expression reveals the dependence of the tortuosity on porosity, which is capable of providing results that are very consistent with the experimental data in the practical porosity range of SOFC. Furthermore, for the high porosity (>0.6), the proposed tortuosity expression is also accurate. This might be helpful for understanding the physical mechanism for the tortuosity of gas transport paths in electrodes and the optimization electrode microstructure for reducing the concentration polarization.

Keywords: solid oxide fuel cells (SOFC); tortuosity; diffusion coefficient; electrode; porous media (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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