Abstract
The solid oxide fuel cell (SOFC), a highly efficient energy conversion device renowned for its low pollutant emissions and superior fuel adaptability, exhibits performance intricacies illuminated through its current-voltage curve. The performance of an SOFC is highly dependent on ionic conductivity within the ionic phase in anode, electrolyte and cathode within the cell. This study focuses on the critical examination of yttria-stabilized zirconia (YSZ) ionic conductivity models, with a specific emphasis on the influence of the pre-exponential factor (A) and activation energy (Ea ). A comprehensive literature on the available YSZ ionic conductivity models is conducted. Both A (range 0.1 x 104 to 4.0 x 104) and Ea (range 9.0R x 103 to 14.0R x 103 kJ2 K-1) are numerically investigated and compared individually to the Bessette model of A = 3.4014 x 104 and Ea = 10.35R x 103 kJ2 K-1. R is the universal gas constant. The numerical analysis is conducted using an in-house developed quasi-3-dimensional SOFC model which treats the SOFC as a single layer of mesh across its thickness direction to greatly reduce its computational cost. It is found that the modified Bessette model with A = 2.0 x 104 and Ea = 10.35R x 103 kJ2 K-1 shows the best agreement with the literature experimental results at 1023 K and 1073 K.
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