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首页> 外文期刊>Catalysis science & technology >The threshold method in the analysis of catalyst layer porosity towards oxygen transport resistance in PEMFCs
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The threshold method in the analysis of catalyst layer porosity towards oxygen transport resistance in PEMFCs

机译：的阈值方法分析催化剂对氧气输送层孔隙度电阻在质子交换膜燃料电池

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摘要

The threshold method is introduced to characterize the porosity of a catalyst layer in this work on the basis of the impact analysis of the ionomer content on oxygen transport resistance. The limiting current method is used to measure the transport resistance of fuel cells with various ionomer content levels. The results show that increasing the ionomer content, especially I/C > 0.7, can cause the enlargement of Fickian resistance and local transport resistance. The increase in local oxygen transport resistance is attributed to the thickening of the ultra-thin ionomer film and the improvement of the ionomer coverage degree at the surface of the Pt particles. The decrease in porosity in the catalyst layer caused by the blocking effect of the ionomer is considered to be the reason for the enlargement of the Fickian resistance. However, according to published work, the measurement of the catalyst layer porosity is limited, especially in situ characterization. Here, the threshold method is applied to characterize the porosity in situ through the calculation of the saturated water content in the fuel cell, since water accumulates via capillarity in the pore structure of the catalyst layer. The characterization results are highly consistent with the trend of the Fickian diffusion coefficient, which verifies the availability of the threshold method for the in situ measurement of porosity in catalyst layers.
机译：介绍了阈值法”来形容催化剂层的孔隙度在这个工作离子交联聚合物的影响分析的基础内容氧气输送阻力。极限电流法用于测量运输燃料电池与各种阻力离子交联聚合物含量水平。增加了离子交联聚合物含量,特别是I / C >0.7,可能导致Fickian增大阻力和当地运输阻力。在当地氧气输送阻力增加归因于超薄的增厚离子交联聚合物膜和离聚物的改善覆盖表面的Pt粒子。催化剂层的屏蔽效应引起的离子交联聚合物被认为是原因Fickian阻力的增大。然而,根据出版工作,催化剂层孔隙度的测量有限,尤其是原位表征。在这里,阈值法应用于描述原位孔隙度通过计算的饱和含水量燃料电池,因为水通过积累毛细现象的孔隙结构催化剂层。与Fickian的趋势一致扩散系数,验证阈值方法的可用性原位测量催化剂层的孔隙度。

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