“…For the CAB that was fueled by FeK/Al + C (CAB 2), as shown in Figure b, a serious concentration polarization appeared at temperatures lower than 825 °C, while for CAB 1, such concentration polarization appeared only at the operating temperature of 725 °C (the lowest temperature investigated). On the basis of the initial I – V curves with the low current density and the linear response of the cell voltage with respect to the polarization current, the calculated CAB resistances were 1.17, 0.90, 0.87, 0.80, 0.72, and 0.65 Ω cm 2 at 725, 750, 775, 800, 825, and 850 °C, respectively, for CAB 1 . As a comparison, the resistances for CAB 2 were 1.61, 1.28, 0.98, 0.80, 0.73, and 0.68 Ω cm 2 at the corresponding temperatures, demonstrating that both CABs have comparable resistances; therefore, the difference in electrochemical performance should be contributed mainly by the performance of the different catalyst–carbon mixtures.…”