Numerical Study on Electrochemical Performance of Low-Temperature Micro-Solid Oxide Fuel Cells with Submicron Platinum Electrodes

The present study established the two-dimensional axisymmetric model for a freestanding circular cell of the low-temperature micro-solid oxide fuel cell (µ-SOFC) that is composed of platinum (Pt) electrodes and a yttria-stabilized zirconia (YSZ) electrolyte. The only membrane electrode assembly (MEA...

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Bibliographic Details
Published in:Energies (Basel) 2018-05, Vol.11 (5), p.1204
Main Authors: Park, Jee, Kim, Dae, Baek, Jong, Yoon, Yong-Jin, Su, Pei-Chen, Lee, Seong
Format: Article
Language:English
Subjects:
Chemical reactions
computational fluid dynamics (CFD)
Computer simulation
Conduction
Conservation equations
Electrochemical analysis
Electrochemistry
Electrodes
electrolyte thickness
Electrolytes
Electrolytic cells
Fuel cells
Fuel technology
High aspect ratio
Kinetics
Low temperature
low-temperature micro-solid oxide fuel cell (LT µ-SOFC)
Mathematical models
Meshing
Operating temperature
Platinum
Reaction kinetics
Solid oxide fuel cells
submicron layer
Temperature effects
Two dimensional models
Yttria-stabilized zirconia
Yttrium oxide
Zirconia
Zirconium dioxide
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Summary:The present study established the two-dimensional axisymmetric model for a freestanding circular cell of the low-temperature micro-solid oxide fuel cell (µ-SOFC) that is composed of platinum (Pt) electrodes and a yttria-stabilized zirconia (YSZ) electrolyte. The only membrane electrode assembly (MEA) was constructed for the numerical simulation in order to avoid the meshing problem with a very high aspect ratio of the submicron layers. We considered the charge and species conservation equations and electrode kinetics to elucidate the intricate phenomena inside the µ-SOFC. The extensive numerical simulations were carried out by using the commercial code to predict the effect of operating temperature and electrolyte thickness on the electrochemical performance of µ-SOFC. Our numerical model was calibrated with the results from experiments, and we provided the average cell current density and overpotentials with respect to the electrolyte thickness and the operating temperature. It was found that the electrochemical performance increased with the increase in operating temperature, owing to both rapid electrochemical reactions and ionic conduction, even in µ-SOFC. Moreover, the major voltage loss of µ-SOFC at low-temperature was caused by the cathodic activation overpotential.
ISSN:1996-1073
1996-1073
DOI:10.3390/en11051204