Electrochemical performance of PrBaCo2O5+δ layered perovskite as an intermediate-temperature solid oxide fuel cell cathode

PrBaCo2O5+delta (PBCO) powder was prepared by a combined EDTA and citrate complexing method. The electrochemical performance of PBCO as a cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs) was evaluated. A porous layer of PBCO was deposited on a 42 mu m thick electrolyte consisting of Ce0.8Sm0.2O1.9 (SDC), prepared by a dry-pressing process. A fuel cell with a structure PBCO/SDC/Ni-SDC provides a maximum power density of 866,583, 313 and 115 mW cm(-2) at 650, 600,550 and 500 degrees C, respectively, using hydrogen as the fuel and stationary air as the oxidant. The total resistance of the cell was about 0.41,0.51,0.57 and 0.77 Omega cm(2), respectively. This encouraging data identifies PBCO as a potential cathode material for IT-SOFCs. (c) 2008 Elsevier B.V. All rights reserved.