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首页> 外文期刊>Ceramic Engineering and Science Proceedings >FUNCTIONALLY GRADED COMPOSITE ELECTRODES FOR ADVANCED ANODE-SUPPORTED, INTERMEDIATE-TEMPERATURE SOFC
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FUNCTIONALLY GRADED COMPOSITE ELECTRODES FOR ADVANCED ANODE-SUPPORTED, INTERMEDIATE-TEMPERATURE SOFC

机译：功能先进的阳极复合中温SOFC梯度复合电极

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This paper describes the development and modeling of anode-supported intermediate-temperature solid oxide fuel cells (ACN-AS-IT-SOFC) that exhibit high electrochemical efficiency, high degree of fuel utilization, and low operating temperature characteristics. The proposed cell design is fuelled by hydrogen or in-situ reformed fuel and operates at a lower temperature of 600-800℃ producing a maximum power density of 2-2.2 W/cm{sup}2. The innovative design for the ACN-AS-IT-SOFC fuel cell makes use of a porous anode consisting of a combination of a highly conductive anode capillary network (ACN) running through the supporting anode manufactured using MER poly capillary material technology. The highly porous anode allows for free fuel gas access to the functional anode. Operating at low temperature of 600-800℃ it allows the use of less expensive interconnect materials such as ferritic steels. A method to identify over-potentials caused by different polarizations in an SOFC with multi-layer hybrid electrodes is also presented. The contributions of each polarization to the total loss in a fuel cell can be identified. The polarization causing the maximum over-potential is then considered as the primary source of internal losses, and optimization is focused to improve the power density. The analysis for the mass transfer polarization considers bulk convection and diffusion in porous layers from bulk flow to the interface of the electrode and electrolyte. Values of the exchange current densities are determined empirically by matching analytical and experimental results. Effects of porosities and thicknesses of anode, cathode, and functional graded layers are modeled and optimized to attain maximum power density.
机译：本文描述了阳极支撑的中温固体氧化物燃料电池（ACN-AS-IT-SOFC）的开发和建模，该电池具有高电化学效率，高燃料利用率和低工作温度特性。拟议的电池设计以氢气或原位​​重整燃料为燃料，并在600-800℃的较低温度下运行，产生的最大功率密度为2-2.2 W / cm {sup} 2。 ACN-AS-IT-SOFC燃料电池的创新设计利用了多孔阳极，该阳极由高导电性阳极毛细管网络（ACN）组合而成，该网络贯穿使用MER聚毛细管材料技术制造的支撑阳极。高度多孔的阳极允许自由燃料气体进入功能性阳极。在600-800℃的低温下运行，它允许使用价格较低的互连材料，例如铁素体钢。还提出了一种在多层混合电极中识别SOFC中不同极化引起的过电势的方法。可以确定每种极化对燃料电池总损耗的贡献。然后，将导致最大超电势的极化视为内部损耗的主要来源，并着重进行优化以提高功率密度。传质极化的分析考虑了从对流到电极和电解质界面的多孔层中的对流和扩散。交换电流密度的值通过匹配分析和实验结果凭经验确定。对阳极，阴极和功能梯度层的孔隙率和厚度的影响进行建模和优化，以实现最大功率密度。

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