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Modeling of single catalyst particle in cathode of PEM fuel cells

机译：PEM燃料电池阴极中单一催化剂颗粒的建模

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摘要

A microscopic catalyst model is proposed for predicting the local mass diffusion of a single catalyst particle in the cathode catalyst layer. The numerical model is employed to obtain a geometric description of the active layer. The cathode catalyst particle model proposed here is based on the microstructure of the catalyst layer. The catalyst particle is treated as many small platinum particles (1-10.0 nm) embedded in the larger carbon particle support (30-100 nm). This assembly is surrounded by an ionomer film with thickness ranging from 0.5 nm to 10.0 nm. The modeling results confirm that the platinum particle size, platinum loading and ionomer thickness can each play an important role on local mass and charge transport in the PEM fuel cell catalyst particle agglomerate. The local spherical diffusion, reactant distribution and electrochemical kinetics are strongly influenced by particle size, platinum loading and ionomer thickness.
机译：提出了一种微观催化剂模型，用于预测阴极催化剂层中单个催化剂颗粒的局部质量扩散。数值模型用于获得活性层的几何描述。本文提出的阴极催化剂颗粒模型基于催化剂层的微观结构。将催化剂颗粒处理为嵌入较大碳颗粒载体（30-100 nm）中的许多小铂颗粒（1-10.0 nm）。该组件被离聚物膜包围，离聚物膜的厚度为0.5 nm至10.0 nm。建模结果证实，铂颗粒尺寸，铂负载量和离聚物厚度均可以在PEM燃料电池催化剂颗粒附聚物中对局部质量和电荷传输起重要作用。局部球形扩散，反应物分布和电化学动力学受到粒径，铂负载量和离聚物厚度的强烈影响。

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