Effect of blending carbon nanoparticles and nanotubes on the formation of porous structure and the performance of proton exchange membrane fuel cell catalyst layers
Effect of blending carbon nanoparticles and nanotubes on the formation of porous structure and the performance of proton exchange membrane fuel cell catalyst layers
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DOI：
10.1016/j.jpowsour.2015.03.119
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发表时间：
2015-07
影响因子：
9.2
通讯作者：
Takahiro Suzuki;Ryohei Hashizume;M. Hayase
中科院分区：
文献类型：
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作者：
Takahiro Suzuki;Ryohei Hashizume;M. Hayase
将不同种类的亚微米结构碳，即炭黑和多壁碳纳米管（MWCNTs）混合在催化剂油墨中，以制备具有不同多孔结构的催化剂层。在常规催化剂层中采用炭黑作为催化剂载体；孔隙结构在很大程度上取决于其集合体结构。在亚微米尺度下，MWCNTs具有与炭黑完全不同的结构。采用两种不同直径的纳米碳纳米管与铂负载碳作为催化剂墨水的共混材料，研究了其对多孔结构和电池性能的影响。含厚MWCNT的催化剂层孔隙率较低，微裂纹较少，气孔较大。纳米碳纳米管的直径影响催化剂层孔径的分布。含有较小直径MWCNTs的催化剂层的孔径分布峰向较小尺寸方向移动。这些特征的多孔结构影响了电池的性能，并在极化曲线上造成了大电流密度下的电压降。这是由于孔隙率和孔隙大小的关系。
Different kinds of sub-micron structured carbon, namely carbon black and multi-walled carbon nanotubes (MWCNTs), were blended in catalyst ink in order to fabricate catalyst layers having differing porous structures. Carbon black is used as catalyst support in the conventional catalyst layers; the pore structure depends strongly on its aggregate structure. MWCNTs have a structure completely different from the carbon black at sub-micron scale. Two kinds of MWCNT, of differing diameters, were used as blending materials in the catalyst ink with the platinum-supported carbon, and their effects on the porous structure and cell performance were investigated. The catalyst layer containing thick MWCNT had lower porosity, fewer micro-cracks and larger pores than the conventional catalyst layer blended with carbon black. The MWCNT diameter influenced the distribution of pore sizes in the catalyst layers. The catalyst layer containing the smaller diameter MWCNTs displayed a shift in the peak of the pore size distribution, toward smaller size. These characteristic porous structures affected the performance of the resulting cell and caused a large voltage drop at high current densities in the polarization curve. This is because of the porosity and also the pore size.