TECHNOLOGY FOCUS - POLYMERS - Preferred Components: (I) further comprises expanded polytetrafluoroethylene (PTFE) having a porous microstructure of polymeric fibrils, and the ion exchange material impregnated throughout the porous microstructure of the expanded PTFE membrane so as to render an interior volume of the expanded PTFE membrane substantially occlusive. (I) comprises a first layer comprising expanded PTFE membrane having a porous microstructure of polymeric fibrils, and (b) ion exchange material impregnated throughout the porous microstructure of the expanded PTFE membrane, and a second layer comprising ion exchange material in the absence of an expanded PTFE membrane. The second layer comprises the peroxide decomposition catalyst. The peroxide decomposition catalyst comprises (c) and (d). The peroxide decomposition catalyst is substantially insoluble in strong acid. The peroxide decomposition catalyst is a non-crystalline polymer, and is bound to a support particle. The support particle comprises alumina, silica or zeolite. The support particle comprises carbon. The metal is present at 0.01-1 (preferably 0.2) wt.% per dry ionomer weight. The metal is cerium or manganese. The peroxide decomposition catalyst is present in at least one of the layers. The solution comprises an ion exchange material. The organic polymer is PVPA. Preferred Method: The method further comprises: adding a support particle to the solution; separating the compound; purifying the compound; drying the compound; preparing an electrode comprising the compound; preparing (I) comprising the compound; forming a catalyst coated membrane comprising the electrode and (I); and forming a fuel cell comprising the catalyst coated membrane. The purification step comprises acid washing. EXAMPLE - A cerium containing peroxide decomposition catalyst bound to carbon using polyvinylphosphonic acid (1.0945 g) was added to an ionomer dispersion (8.9905 g) consisting of 20.6% solids in deionized water with additional deionized water (7.4807 g) to give an ink. The mix was placed in a vial and dispersed using Silverson (RTM: High shear mixer/homogenizer) at 10000 rpm for 25 minutes. The dispersion was placed in the original vial onto a magnetic stirrer and a small polytetrafluoroethylene coated stir bar was added. The dispersion was stirred slowly for several hours or overnight to remove bubbles resulting from the high shear dispersion. The mix was diluted 2:1 with deionized water and stirred. An aliquot of the diluted mix (6.5 g) was then combined with 22% butanediol ionomer (30 g) and mixed again. Then the solution was used to prepare the solid polymer electrolyte membrane.