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首页> 外文会议>International symposium on solid oxide fuel cells >CERIA/BISMUTH OXIDE BILAYERED ELECTROLYTES FORLOW TEMPERATURE SOLID OXIDE FUEL CELLS
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CERIA/BISMUTH OXIDE BILAYERED ELECTROLYTES FORLOW TEMPERATURE SOLID OXIDE FUEL CELLS

机译：Ceria /铋氧化物双层电解质熔化温度固体氧化物燃料电池

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摘要

Bismuth oxide and doped ceria are among the highest ionic conducting solid oxide electrolytes and are therefore less resistive for low temperature operation than the conventional zirconia based electrolytes. Unfortunately, bismuth oxide is unstable at low oxygen partial pressures and ceria yields an efficiency loss due to the appearance of electronic conduction under reducing conditions. We demonstrated earlier (1) that a bilayered electrolyte of erbia stabilized bismuth oxide (ESB) on the oxidizing side and a layer of samaria doped ceria (SDC) on the reducing side, could be used to prevent the decomposition of bismuth oxide and block electronic conduction under fuel cell conditions. This arrangement has the potential to perform as a low temperature SOFC electrolyte, the feasibility of which is examined in this paper. In this work we present a model, for defect flux in bilayers, that enables us to resolve the issues of stability and efficient power generation for a bilayer. We show how the thickness ratio may be optimized with respect to open circuit potential, conductivity and the stability of the bismuth oxide layer. To verify the feasibility of the bilayer for low temperatures, the area specific resistance of an SDC/ESB bilayer is plotted as a function of thickness ratio.
机译：氧化铋和掺杂的二氧化铈是最高离子传导固体氧化物电解质中的，因此对低温操作的电阻较低而不是常规的氧化锆基电解质。不幸的是，在低氧分压下氧化铋不稳定，并且由于在还原条件下，Ceria由于电子传导的出现而产生效率损失。我们之前证明的（1）伊尔比亚的双层电解质稳定的氧化铋（ESB）在氧化侧和撒母虫层的一层掺杂的分侧（SDC）用于防止氧化铋和块电子的分解在燃料电池条件下传导。这种布置具有作为低温SOFC电解质进行的电位，本文中的可行性进行了可行性。在这项工作中，我们提出了一种模型，用于双层缺陷通量，使我们能够解决双层的稳定性和高效发电问题。我们展示了如何相对于开路电位，导电性和氧化铋层的稳定性优化厚度比。为了验证双层为低温的可行性，SDC / ESB双层的面积电阻被绘制为厚度比的函数。

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