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Effect of bi-layer interconnector design on mass transfer performance in porous anode of solid oxide fuel cells

机译:双层互连器设计对固体氧化物燃料电池多孔阳极传质性能的影响

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摘要

We propose a novel interconnector design, termed bi-layer interconnector, for solid oxide fuel cells (SOF-Cs). It can disturb the fuel gas and air on the planes normal to the SOFC three-phase-boundary (TPB) layer. In this paper, a two-dimensional half-cell model is developed to study the concentration overpotentials in the fuel side of the SOFC stack with conventional and novel bi-layer interconnectors. The numerical results show that the novel bi-layer interconnector can increase the velocity of the fuel gas in the porous anode. The results of mole fraction distribution illustrate that the novel bi-layer interconnector can effectively disturb the fuel flow. The average H_2 mole fraction in the porous anode of SOFC with bi-layer interconnector is about 4.7% higher than that of conventional SOFC. The average H_2 mole fraction at TPB interface is about 9.2% higher. The concentration overpotential of the novel SOFC design is lower than that of the conventional SOFC design by 5%. It can enhance the mass transfer in porous electrode and improve the performance of SOFC.
机译:我们提出了一种新颖的互连器设计,称为双层互连器,用于固体氧化物燃料电池(SOF-Cs)。它会干扰垂直于SOFC三相边界(TPB)层的平面上的燃料气体和空气。在本文中,建立了二维半电池模型,以研究使用传统和新型双层互连器的SOFC堆燃料侧的浓度超电势。数值结果表明,新型双层互连器可以提高多孔阳极中燃料气体的速度。摩尔分数分布的结果表明,新型双层互连器可以有效地扰乱燃料流。具有双层互连器的SOFC的多孔阳极中的平均H_2摩尔分数比常规SOFC高约4.7%。在TPB界面的平均H_2摩尔分数约高9.2%。新型SOFC设计的浓度超电势比常规SOFC设计的浓度超电势低5%。它可以增强多孔电极中的传质并改善SOFC的性能。

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