A new upcoming battery concept, denominated Rechargeable Oxide Battery, combines a conventional solid oxide fuel cell with an iron based storage media. By switching between fuel cell mode and electrolyzer mode the porous storage reacts with the ambient H_2/H_2O-atmosphere in order to discharge (ox) and to charge (red) the ROB-system. Thereby, the H_2O acts as an oxygen-ion carrier to accelerate the oxidation and reduction kinetics by means of a shuttle-mechanism between the electrode surface and the storage media. To indicate the influence of material composition on the redox kinetics, various oxides (8YSZ, ZrO_2, Al_2O_3) were added as a support matrix in order to optimize the redox response behavior. Therefore, samples were tape-casted and subsequently analyzed with a TG-MS system under simulated ROB conditions (800°C, Ar-50%H_2 or Ar-7%H_2O). The results of this study indicate that doping of the storage materials is providing a high potential to mitigate degradation effects in order to ensure a maximum ROB energy yield.
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