Investigation of Gas Transport Properties of PEMFC Catalyst Layers Using a Microfluidic Device
Investigation of Gas Transport Properties of PEMFC Catalyst Layers Using a Microfluidic Device
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DOI：
10.1149/1945-7111/abaf28
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发表时间：
2020-08
影响因子：
3.9
通讯作者：
Takahiro Suzuki;Y. Nakata;Fumiaki Tsutsui;S. Tsushima
中科院分区：
文献类型：
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作者：
Takahiro Suzuki;Y. Nakata;Fumiaki Tsutsui;S. Tsushima
使用微流体装置评估质子交换膜燃料电池中使用的催化剂层的有效气体扩散率、多孔结构和弯曲系数。催化剂层足够的气体传输性能是实现高性能催化剂层和燃料电池的关键因素。在本研究中，评估了不同厚度和不同碳载体的催化剂层。将独立炭黑和多壁碳纳米管混合到催化剂层中作为载体。全炭黑基催化剂层包含一定体积的孤立孔和一定量的微裂纹，这取决于其厚度。考虑孤立孔隙和微裂纹的影响来评估弯曲系数。然而，全炭黑基催化剂层的弯曲系数大于众所周知的布鲁格曼相关弯曲系数。当将碳纳米管掺入催化剂层时，弯曲系数急剧降低至炭黑基催化剂层的一半以下。由纤维支撑物形成的直孔数量的变化和离聚物分布的变化可以影响弯曲系数。
The effective gas diffusivity, porous structure, and tortuosity factor of catalyst layers used in proton exchange membrane fuel cells were evaluated using a microfluidic device. Sufficient gas transport properties of the catalyst layers are a key factor for achieving high-performance catalyst layers and fuel cells. In the present study, catalyst layers with different thicknesses and different carbon supports were evaluated. Stand-alone carbon black and multi-walled carbon nanotubes were blended into the catalyst layers as the support. The all-carbon-black-based catalyst layer contained some volume of isolated pores and some amount of microcracks, which depended on its thickness. The tortuosity factor was evaluated considering the effects of the isolated pores and microcracks. However, the tortuosity factor of the all-carbon-black-based catalyst layer was larger than the well-known Bruggeman-correlated tortuosity factor. When carbon nanotubes were blended into the catalyst layer, the tortuosity factor was drastically decreased to less than one-half that of the carbon-black-based catalyst layers. A change in the number of straight pores formed by the fibrous support and variation of the ionomer distribution can affect the tortuosity factor.