A novel high-temperature energy storage system based on an SOFC is presented (Power-to-Storage). The energy is stored as a metal/metal oxide which is part of the fuel side. However, in contrast to a classical SOFC, the fuel side is kept under stagnant hydrogen/water vapor. By using the cell as an electrolyzer (SOEC), the surplus electricity (from renewable energy sources) is used to charge the system by reducing a metal oxide. Vice versa, if energy is needed the system works as an SOFC thereby oxidizing the metal (discharging the battery). First results from storage material development and stack testing are presented.
Advanced transparent ceramics with high chemical and thermal stability are gaining increasing interest as replacement of glass-based materials in technical window applications. The mechanical reliability and performance of transparent MgAl 2 O 4 with a grain size of 5 lm has been characterized at ambient temperature using micro-mechanical indentation and macroscopic bending tests. The measurements focused on elastic modulus, fracture toughness, crack kinetics, and strength, the latter analyzed with Weibull statistics. The effect of slow crack growth is assessed using a strength-probability-time plot. Complementary fractography by optical, confocal and scanning electron microscopy provided a correlation between failure origin and fracture stress. The results and reliability aspects are discussed in terms of linear elastic fracture mechanics.
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