Effects of Microstructure of Carbon Support in the Catalyst Layer on the Performance of Polymer‐Electrolyte Fuel Cells
Effects of Microstructure of Carbon Support in the Catalyst Layer on the Performance of Polymer‐Electrolyte Fuel Cells
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DOI：
10.1149/1.1836988
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发表时间：
1996-07
影响因子：
3.9
通讯作者：
M. Uchida;Yuko Fukuoka;Y. Sugawara;N. Eda;A. Ohta
中科院分区：
文献类型：
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作者：
M. Uchida;Yuko Fukuoka;Y. Sugawara;N. Eda;A. Ohta
对于聚合物电解质燃料电池 (PEFC)，反应位点存在于覆盖有 PFSI 的铂 (Pt) 表面上。虽然PFSI膜用作PEFC的电解质，但该膜不会像液体电解质那样深深地渗透到电极中。因此，将PFSI溶液浸渍到催化剂层中以增加Pt和PFSI之间的接触面积。在我们之前的工作中，我们提出了一种新的机电组件制备方法，强调PFSI的胶体形成，以优化催化剂层中PFSI的网络，并简化机电组件的制造过程。在这项工作之后，我们重点研究了催化剂层的微观结构。气体扩散电极的形态特性对性能的重要性已在多篇论文中报道。据称该催化剂层具有两种独特的孔隙分布，其边界约为。 0.1{μ}米。较小的孔（初级孔）被认为是碳载体附聚物中的初级颗粒内部和之间的空间，而较大的孔（次级孔）是附聚物之间的空间。在我们最近的工作中，我们报道了 PFSI 仅分布在次生孔隙中，因此反应位点仅限于该位置。结果表明，对于具有液体电解质的燃料电池，PEFC 系统需要一种特殊的设计，而不是传统的设计。我们提出催化剂层的新颖结构和/或制备方法是提高 Pt 利用率的关键。 « less
In the case of the Polymer-electrolyte fuel cells (PEFCs), the reaction sites exist on the platinum (Pt) surface covered with PFSI. Though PFSI membrane is used as an electrolyte of the PEFC, the membrane does not soak deeply into the electrodes as a liquid electrolyte does. Therefore, PFSI solution was impregnated into the catalyst layers to increase the contact areas between Pt and PFSI. In our previous work we proposed a new preparation method of the M&E assembly which emphasized the colloid formation of the PFSI to optimize the network of PFSIs in the catalyst layer and also to simplify the fabrication process of the M&E assembly. Following this work, we focused on the microstructure of the catalyst layer. The importance of the morphological properties of the gas-diffusion electrodes on performance has been reported in several papers. The catalyst layer was claimed to have had two distinctive pore distributions with a boundary of ca. 0.1 {mu}m. The smaller pore (primary pore) was identified with the space in and between the primary particles in the agglomerate of the carbon support and the larger one (secondary pore) was that between the agglomerates. In our recent work, we reported that the PFSI wasmore » distributed only in the secondary pores, and the reaction sites were therefore limited to that location. The results indicated that the PEFC system required a particular design rather than a conventional one for the fuel cells with liquid electrolytes. We proposed that novel structure and/or preparation methods of the catalyst layer were keys to higher utilization of Pt.« less