A General Approach for Electrochemical Impedance Spectroscopy Simulation Using Transient Mechanistic SOFC Model

作者：Shi Yixiang^*; Cai Ningsheng; Li Chen; Bao Cheng; Croiset Eric; Qian Jiqin; Hu Qiang; Wang Shaorong

来源：10th International Symposium on Solid Oxide Fuel Cells, 2007-06-03 to 2007-06-08.

DOI：10.1149/1.2729301

A general approach for electrochemical impedance spectroscopy (EIS) simulation was developed by solving a 1-D transient model based on physical conservation laws. This method is not specific to a certain type of electrochemical system nor is material dependent. This approach is illustrated in this paper by developing a transient model of an anode-supported SOFC button cell consisting of Ni-YSZ vertical bar Ni-ScSZ vertical bar ScSZ vertical bar LSM-ScSZ multiple layers. In this model, instead of being considered as boundary conditions at the electrode/electrolyte interface, the electrochemical reaction zone expanded though the electrode. The transient model has been solved for imposed sinusoidal voltage perturbations at different frequencies. The results have then been transformed into EIS spectra. The EIS simulation results were compared with experimental data under different temperatures using humidified H-2 fuel and air oxidant to prove the validity of the EIS modeling approach. The model was further validated by comparing the steady-state results obtained from the transient model with the polarization curves.

• 出版日期2007
• 单位清华大学