BaZr0.1Ce0.7Y0.1Yb0.1O3-δ electrolyte-based solid oxide fuel cells with cobalt-free PrBaFe2O5+δ layered perovskite cathode

A new anode-supported SOFC material system Ni-BZCYYb vertical bar BZCYYb vertical bar PBFO is investigated, in which a cobalt-free layered perovskite oxide, PrBaFe2O5+delta (PBFO), is synthesized and employed as a novel cathode while the synthesized BZCYYb is used as an electrolyte. The cell is fabricated by a simple dry-pressing/co-sintering process. The cell is tested and characterized under intermediate temperature range from 600 to 700 degrees C with humified H-2 (similar to 3% H2O) as fuel, ambient air as oxidant. The results show that the open-circuit potential of 1.006 V and maximal power density of 452 mW cm(-2) are achieved at 700 degrees C. The polarization resistance of the electrodes is 0.18 Omega cm(2) at 700 degrees C. Compared to BaZr0.1Ce0.7Y0.1O3-delta, the conductivity of co-doped barium zirconate-cerate BZCYYb is significantly improved. The ohmic resistance of single cell is 0.37 Omega cm(2) at 700 degrees C. The results indicate that the developed Ni-BZCYYb vertical bar BZCYYb vertical bar PBFO cell is a promising functional material system for SOFCs. Published by Elsevier B.V.