Design optimization of rib/channel patterns in a PEMFC through performance heterogeneities modelling
Design optimization of rib/channel patterns in a PEMFC through performance heterogeneities modelling
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DOI：
10.1016/j.ijhydene.2018.03.036
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发表时间：
2018-05
影响因子：
7.2
通讯作者：
Bolahaga Randrianarizafy;P. Schott;M. Chandesris;M. Gerard;Y. Bultel
中科院分区：
文献类型：
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作者：
Bolahaga Randrianarizafy;P. Schott;M. Chandesris;M. Gerard;Y. Bultel
本文开发了一种耦合沿通道和肋通道模型的方法，以对 PEM 燃料电池双极板肋/通道模式进行设计优化。整体性能主要来自电流收集和供氧之间的竞争。建议研究几何形状和操作参数对最终平衡和优化的影响。此外，还考虑了肋对 GDL 的挤压效应所产生的不均匀性。模型中使用的电化学参数在用于优化过程之前先与实验测量结果相拟合。通道/肋尺度的结果显示了从气体通道到催化剂层的氧气供应与肋的电流收集之间的竞争。这种理解是可能的，这要归功于模型给出的局部条件（例如氧气浓度），而这些条件是通过实验测量很难达到的。催化剂层中电流密度分布呈现面内和面内不均匀性。对阴极侧的沟道宽度/总宽度比进行了设计优化。该模型通过改变沿流动方向的宽度来建议最佳通道设计，而标准设计则考虑含量比。该最佳通道主要取决于氧气的化学计量比。
In this paper, an approach coupling an along the channel and rib-channel models has been developed to perform a design optimization of PEM fuel cell bipolar plates rib/channel patterns. Overall performance mainly results from a competition between current collection and oxygen supply. The allows proposed to investigate the effect of geometry and operating parameters on the resulting equilibrium and optimum. Moreover, heterogeneities issued from the crushing effect by the rib on the GDL are accounted.The electrochemical parameters used in the model are fitted to experimental measurements before being used in the optimization process. Results at the channel/rib scale show the competition between the oxygen supply from the gas channel to the catalyst layer and the current collection by the ribs. This understanding is possible thanks to the access to local conditions (such as the oxygen concentration) given by the model which are difficult to reach with experimental measurements. In-plane and through plane heterogeneities of current density distribution in the catalyst layer are exhibited.Design optimization is performed on the channel width/total width ratio on the cathode side. The model suggests an optimal channel design by varying its width along the flow while the standard design considers a contant ratio. This optimal channel is shown to be mainly dependent on the stoichiometry ratio of oxygen.