The Geometry Effect of Cathode/Anode Areas Ratio on Electrochemical Performance of Button Fuel Cell Using Mixed Conducting Materials

Daifen Chen, Biao Hu, Kai Ding, Cheng Yan and Liu Lu
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Daifen Chen: School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Biao Hu: School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Kai Ding: School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Cheng Yan: School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Liu Lu: School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China

Energies, 2018, vol. 11, issue 7, 1-16

Abstract: Intermediate temperature (IT) fuel cells using mixed conducting materials have been reported by many researchers by adopting different compositions, microstructures, manufacture processes and testing conditions. Most i op - V op relationships of these button electrochemical devices are experimentally achieved based on anode or cathode surface area (i.e., A an ≠ A ca ). In this paper, a 3D multi-physics model for a typical IT solid oxide fuel cell (SOFC) that carefully considers detail electrochemical reaction, electric leakage, and e − , ion and gas transporting coupling processes has been developed and verified to study the effect of A ca / A an on button cell i op - V op performance. The result shows that the over zone of the larger electrode can enhance charges and gas transport capacities within a limited scale of only 0.03 cm. The over electrode zone exceed this width would be inactive. Thus, the active zone of button fuel cell is restricted within the smaller electrode area min( A an , A ca ) due to the relative large disc radius and thin component layer. For a specified V op , evaluating the responded i op by dividing output current I op with min( A an , A ca ) for a larger value is reasonable to present real performance in the current device scale of cm. However, while the geometry of button cells or other electrochemical devices approach the scale less than 100 μ m , the effect of over electrode zone on electrochemical performance should not be ignored.

Keywords: electrode areas ratio effect; electrochemical performance; mixed conducting material; multi-physics numerical modeling (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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