As nanoscience is a diverse, multi-disciplined field incorporating the laws of physics, chemistry, biology, mathematics. The rapid development in the field of nanoscience and nanotechnology has driven a tremendous interest in understanding more and more about the behavior of materials at nano- and subnano-scale. Using these nanomaterials to fulfill world's need of energy is the main concept of this book. Here nanomaterials are applied in SOFC as the application of the fuel cell technologies may be one of the most important technological advancement of the next decades.