Anode-Oxidizing Critical Operating Conditions of Large Planar Solid Oxide Fuel Cell

• Main Authors: Li, Hangyue, Cui, Tonghui, Han, Minfang
• Format: Conference Proceeding
• Language: English
• ISSN: 1938-5862; 1938-6737
• DOI: 10.1149/10301.0831ecst

Anode oxidation is a damaging fault in SOFC that may happen at high fuel utilization. To avoid anode oxidation, a 1D polarization and impedance model was developed for large planar SOFC, in order to reveal the critical operating condition. The model was validated with both experimentally measured j-V curve and impedance. The overpotential and impedance at each locality of the planar cell is predicted by a lumped-parameter model calibrated with button cell experimental data, with an RMS relative voltage error of 2.3%. The predicted operating voltage of a planar cell at given total current agrees well with measured data, with an RMS relative voltage error of 3.0%. At 750°C, the critical operating voltage increases up to 0.73 V as the fuel flow rate decreases. Further work is ongoing on a 2D spatially resolved model accounting for temperature distribution for more accurate prediction of anode-oxidizing operating conditions.