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A lung-inspired approach to scalable and robust fuel cell design†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2017-10-25 00:00:00 , DOI: 10.1039/c7ee02161e P. Trogadas 1, 2, 3, 4, 5 , J. I. S. Cho 1, 2, 3, 4, 5 , T. P. Neville 1, 2, 3, 4, 5 , J. Marquis 6, 7, 8, 9 , B. Wu 3, 4, 10 , D. J. L. Brett 2, 3, 4, 5, 11 , M.-O. Coppens 1, 2, 3, 4
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2017-10-25 00:00:00 , DOI: 10.1039/c7ee02161e P. Trogadas 1, 2, 3, 4, 5 , J. I. S. Cho 1, 2, 3, 4, 5 , T. P. Neville 1, 2, 3, 4, 5 , J. Marquis 6, 7, 8, 9 , B. Wu 3, 4, 10 , D. J. L. Brett 2, 3, 4, 5, 11 , M.-O. Coppens 1, 2, 3, 4
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A lung-inspired approach is employed to overcome reactant homogeneity issues in polymer electrolyte fuel cells. The fractal geometry of the lung is used as the model to design flow-fields of different branching generations, resulting in uniform reactant distribution across the electrodes and minimum entropy production of the whole system. 3D printed, lung-inspired flow field based PEFCs with N = 4 generations outperform the conventional serpentine flow field designs at 50% and 75% RH, exhibiting a ∼20% and ∼30% increase in performance (at current densities higher than 0.8 A cm−2) and maximum power density, respectively. In terms of pressure drop, fractal flow-fields with N = 3 and 4 generations demonstrate ∼75% and ∼50% lower values than conventional serpentine flow-field design for all RH tested, reducing the power requirements for pressurization and recirculation of the reactants. The positive effect of uniform reactant distribution is pronounced under extended current-hold measurements, where lung-inspired flow field based PEFCs with N = 4 generations exhibit the lowest voltage decay (∼5 mV h−1). The enhanced fuel cell performance and low pressure drop values of fractal flow field design are preserved at large scale (25 cm2), in which the excessive pressure drop of a large-scale serpentine flow field renders its use prohibitive.
中文翻译：
肺部启发的可扩展且坚固的燃料电池设计方法†
采用肺部启发的方法来克服聚合物电解质燃料电池中反应物的均质性问题。肺的分形几何形状用作设计不同分支代流场的模型，从而使反应物在电极上的分布均匀，并使整个系统的熵最小。N = 4代的3D打印，基于肺启发的流场PEFC在RH分别为50％和75％时优于传统的蛇形流场设计，性能提高了约20％和约30％（在电流密度高于0.8 A的情况下） cm -2）和最大功率密度。就压降而言，N的分形流场对于所有经过测试的RH，= 3和4代产品的值比传统的蛇形流场设计分别降低了约75％和约50％，从而降低了反应物加压和再循环的功率要求。在延长的电流保持测量下，均匀的反应物分布的积极作用是明显的，在这种情况下，具有N = 4代的肺启发性基于流场的PEFC表现出最低的电压衰减（〜5 mV h -1）。分形流场设计的增强的燃料电池性能和低压降值在大规模（25 cm 2）时得以保留，其中大规模蛇形流场的过大压降使其无法使用。
更新日期：2017-10-25
中文翻译：
肺部启发的可扩展且坚固的燃料电池设计方法†
采用肺部启发的方法来克服聚合物电解质燃料电池中反应物的均质性问题。肺的分形几何形状用作设计不同分支代流场的模型，从而使反应物在电极上的分布均匀，并使整个系统的熵最小。N = 4代的3D打印，基于肺启发的流场PEFC在RH分别为50％和75％时优于传统的蛇形流场设计，性能提高了约20％和约30％（在电流密度高于0.8 A的情况下） cm -2）和最大功率密度。就压降而言，N的分形流场对于所有经过测试的RH，= 3和4代产品的值比传统的蛇形流场设计分别降低了约75％和约50％，从而降低了反应物加压和再循环的功率要求。在延长的电流保持测量下，均匀的反应物分布的积极作用是明显的，在这种情况下，具有N = 4代的肺启发性基于流场的PEFC表现出最低的电压衰减（〜5 mV h -1）。分形流场设计的增强的燃料电池性能和低压降值在大规模（25 cm 2）时得以保留，其中大规模蛇形流场的过大压降使其无法使用。
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