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Doped-B&O3 forms a vast array of solid solutions, 1801-1826 (August 1999). having very high oxygen ion conductivities, with many other metal oxides. A number of other doped-Bi203 were examined here, and a new family known as BIMEVOX and Aurivillius phases are worth mentioning. These are based on B&V,0 1 1, with a metal ion (Cu or Ni, for example) replacing some of the V in solid solution. The paper also examines some of the newer systems, and shows that the structures are very complex, although a lot of work is still being undertaken to realise a stable high oxygen ion conductor.
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Thin-film electrocatalyst layers with varying PTFE and Nafion contents for unitized regenerative PEM fuel cells (URFCs) made using the paste method were examined as URFC electrodes. Adding Ir catalyst to the oxygen electrode layer significantly improved performance. Catalyst loadings can be reduced