Highly Efficient CuCo 2 O 4 Decorated Er 0.4 Bi 1.6 O 3 Nanostructured Cathode for Intermediate Temperature Solid Oxide Fuel Cells

The cathode efficiency for intermediate temperature solid oxide fuel cells is largely limited by the catalytic activity for oxygen reduction reaction. Here by, we design and synthesize CuCo 2 O 4 decorated Er 0.4 Bi 1.6 O 3 cathode by means of a simple gelation method and then screen‐print it on scandium‐stabilized zirconia electrolyte cell followed by a relatively lower temperature sintering process. The decoration of CuCo 2 O 4 adequately enhances the electro‐catalytic activity of the composite cathode for the ORR. In addition, Er 0.4 Bi 1.6 O 3 matrix also reduces the sintering temperature (from 1000 °C to 850 °C) compared to the pristine CuCo 2 O 4 electrode. The CuCo 2 O 4 ‐decorated‐Er 0.4 Bi 1.6 O 3 composite cathode demonstrates a lower polarization resistance (0.016 Ω cm 2 at 800 °C) in air, exhibiting an 87% decrease in comparison to the primary CuCo 2 O 4 cathode.