Oxygen storage materials with a chemical composition of Ce0.8Zr0.2O2 and V2O5, were prepared and incorporated into the cathode catalyst layer of proton-exchange membrane fuel cells, respectively. The presence of Ce0.8Zr0.2O2 slightly enhanced the performance of the fuel cell, but the incorporation Of V2O5 largely decreased the fuel cell performance. (C) 2003 Elsevier Science B.V. All rights reserved.