An Experimental and Modelling Study of the Performance of a Single-Cell SOFC Stack Operating on Mixtures of H_2-CO-H_2O-CO_2

摘要

Experimental data were generated with fuel-gas mixtures containing H_2, CO, H_2O and CO_2 and representing 15 to 85% utilization of a CH_4-H_2O mixture at S/C=2 in a single cell stack with a Ni-based anode and LSM cathode at 750-850°C. A model of a fuel cell was developed using equilibrium kinetics for the steam reforming and water-gas shift reactions. Good agreement with experimental data was obtained using only the hydrogen oxidation reaction for calculating the Nernst voltage and making use of simple expressions for cell losses. Stack performance was simulated for operation at 750-850°C assuming 10-micron thin electrolytes. Computed peak power densities were 700 mW/cm~2, 450 mW/cm~2 and 275 mW/cm~2 at 850, 800 and 750°C respectively.