Engineered cathodes for high performance SOFCs
Engineered cathodes for high performance SOFCs
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DOI：
10.1016/j.jpowsour.2003.09.055
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发表时间：
2003-12
影响因子：
9.2
通讯作者：
R. Williford;Prabhakar Singh
中科院分区：
文献类型：
--
作者：
R. Williford;Prabhakar Singh
高性能阴极的计算设计分析是探索固体氧化物燃料电池新的微结构和材料选择的经济有效的手段。开发了一种双层多孔阴极设计，包括在阴极/电解液界面处具有较薄的颗粒直径的较薄的层，以及在电极/氧化剂界面处具有较大颗粒的相对较厚的外层。给出了电流产生空间相关分布的确定、浓差极化重要性的评估以及对可测量微结构变量的敏感性的结果。对电极在700℃空气中的性能估计表明，在0.078V时性能达到3.1a/cm2在理论上是可能的。描述了该模型的局限性，以及验证和完善预测所需的努力。讨论了制作该电极结构的可行性。
Computational design analysis of a high performance cathode is a cost-effective means of exploring new microstructure and material options for solid oxide fuel cells. A two-layered porous cathode design has been developed that includes a thinner layer with smaller grain diameters at the cathode/electrolyte interface followed by a relatively thicker outer layer with larger grains at the electrode/oxidant interface. Results are presented for the determination of spatially dependent current generation distributions, assessment of the importance of concentration polarization, and sensitivity to measurable microstructural variables. Estimates of the electrode performance in air at 700°C indicate that performance approaching 3.1A/cm2at 0.078V is theoretically possible. The limitations of the model are described, along with efforts needed to verify and refine the predictions. The feasibility of fabricating the electrode configuration is also discussed.