Proton conduction is an intrinsic part of all life processing systems including, for example, biological photosynthesis of green plants. Besides nature, proton conductors have a significant technological interest: especially as a separating material (electrolyte) for various electrochemical devices such as fuel cells. In this context, there is a need for new materials and acceptor-doped perovskite oxides, have shown high proton conductivity. Therefore, they may be used as electrolyte materials for fuel cells. This book focuses on acceptor-doped BaZrO3perovskite oxides. There is a lot of on-going research aimed at improving the proton conductivity in these materials. In this work it was shown for the first time that it is possible to increase the proton conductivity by increasing the doping concentrations to very high levels. In addition to this, the influence of different acceptor-dopant ions and co-doping on proton conductivity was investigated. The outcome of these investigations are useful for a deeper understanding of the conduction mechanism and will thereby help in improving conduction properties and in predicting new materials with higher proton conductivity.

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