Bi 1.4 Er 0.6 O 3 ‐(La 0.74 Bi 0.10 Sr 0.16 ) MnO 3‐δ Cathodes Fabricated By Ion‐impregnating Method For IT‐SOFCs

Bi 1.4 Er 0.6 O 3 ‐(La 0.74 Bi 0.10 Sr 0.16 )MnO 3‐δ (ESB‐LBSM) composite cathodes were fabricated by impregnating the ionic conducting ESB matrix with the LBSM electronic conducting materials. The ion‐impregnated ESB‐LBSM cathodes were beneficial for the O 2 reduction reactions, and the performance of these cathodes was investigated at temperatures below 700 °C by AC impedance spectroscopy and the results indicated that the ion‐impregnated ESB‐LBSM system had an excellent performance. At 700 °C, the lowest cathode polarisation resistance ( R p ) was only 0.07 Ω cm 2 for the ion‐impregnated ESB‐LBSM system. For the performance testing of single cells, the maximum power density was 1.0 W cm –2 at 700 °C for a cell with the ESB‐LBSM cathode. The results demonstrated that the unique combination of the ESB ionic conducting matrix with electronic conducting LBSM materials was a valid method to improve the cathode performance, and the ion‐impregnated ESB‐LBSM was a promising composite cathode material for the intermediate‐temperature solid oxide fuel cells.