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首页> 外文会议>International Conference on Advanced Ceramics and Composites >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：功能梯度复合电极，用于高级阳极支撑，中间温度SOFC

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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 deg C producing a maximum power density of 2-2.2 W/cm~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 deg C 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 lo 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：本文介绍了具有高电化学效率，高燃料利用率和低操作温度特性的阳极支持的中间温度固体氧化物燃料电池（ACN-AS-AT-SOFC）的开发和建模。所提出的电池设计由氢气或原位​​改造的燃料燃料，并在600-800℃的较低温度下操作，产生2-2.2厘米/厘米〜2的最大功率密度为ACN的创新设计-SOFC燃料电池利用由使用MER多毛细管材料技术制造的支撑阳极的高导电阳极毛细管网络（ACN）的组合来使用多孔阳极。高孔阳极允许自由燃料气体进入功能阳极。在600-800℃的低温下操作它允许使用较便宜的互连材料，例如铁素体钢。还提出了一种识别由具有多层混合电极的SOFC中不同偏振引起的过电位的方法。可以识别每个偏振对燃料电池中的总损耗的贡献。然后将导致最大电位的极化被认为是内部损耗的主要源，并且优化集中于提高功率密度。传质偏振的分析，将散装对流和在多孔层中的扩散与电极和电解质的界面进行多孔层。通过匹配分析和实验结果，凭经验确定了交换电流密度的值。孔径，阴极和功能分级层的孔隙率和厚度的影响是建模和优化的，以获得最大功率密度。

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