Fabrication and performance evaluation of structurally-controlled PEMFC catalyst layers by blending platinum-supported and stand-alone carbon black
Fabrication and performance evaluation of structurally-controlled PEMFC catalyst layers by blending platinum-supported and stand-alone carbon black
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DOI：
10.1016/j.jpowsour.2013.01.092
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发表时间：
2013-07
影响因子：
9.2
通讯作者：
Takahiro Suzuki;S. Tsushima;S. Hirai
中科院分区：
文献类型：
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作者：
Takahiro Suzuki;S. Tsushima;S. Hirai
在质子交换膜燃料电池中，催化剂层是实现高性能和低成本的关键部件。控制催化剂层的结构很重要，因为它有助于改善反应物和产品在催化剂层中的传输，这反过来又显著影响总的潜在损失。在本研究中，我们采用了一种通过混合铂支载和独立炭黑来控制催化层结构的方法。通过控制催化剂层的厚度或铂含量，保持其他变量不变，合成了催化剂层，并在实际的燃料电池中进行了评价。结果表明，铂负载量越低，电池性能越差，而催化剂层越薄，电池性能越好。通过对不同条件下电池性能评价的分析表明，在苛刻的操作条件下，催化层中的局部传质(质子和/或氧气)和水淹对电池的性能起着重要的作用。
In proton exchange membrane fuel cells, catalyst layers are key components for achieving higher performance and lower cost. Controlling the structure of the catalyst layers is important, since it can contribute to improving the transport of reactants and products in the catalyst layers, which in turn significantly affects overall potential loss. In this study, we adopted a method of controlling the structure of the catalyst layers by blending platinum-supported and stand-alone carbon black. Catalyst layers in which either thickness or platinum loading were controlled, keeping the other variable constant, were synthesized and evaluated in actual fuel cells. The results showed that lowering the platinum loading caused a drop in cell performance, while thinning the catalyst layer gave better performance. From analyses of the performance evaluations in various conditions, it was indicated that local mass transport (proton and/or oxygen) and water flooding in the catalyst layers plays an important role in cell performance under demanding operating conditions.