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首页> 外文期刊>Russian journal of electrochemistry >Alkaline Fuel Cells: Calculating and Comparing Overall Currents of Hydrophobized Cathodes with Thin Regular-Structure and Thick Stochastic-Structure Active Layers
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Alkaline Fuel Cells: Calculating and Comparing Overall Currents of Hydrophobized Cathodes with Thin Regular-Structure and Thick Stochastic-Structure Active Layers

机译：碱性燃料电池：计算和比较具有规则结构薄和随机结构有源层的疏水化阴极的总电流

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摘要

A concept of active hydrophobized active layers with regular structure is introduced. In these layers, a hydrophobizer takes part in the development of gas pores representing a set of straight identical rods (cylinders) uniformly distributed over the active layer and extended in a direction perpendicular to the cathode surface. An advantage of cathodes with a thin regular-structure active layer is the reproducibility of their characteristics and a low content of platinum catalyst (up to tenth and even hundredth fractions of mg/cm(2)). A comparison of current characteristics of thin (with the thickness of several tens of mu m) active layers with a regular structure and thick (with the thickness of several hundreds of mu m) with the stochastic distribution of the hydrophobizer (with randomly distributed polytetrafluoroethylene) is made. For a fuel cell with an alkaline electrolyte (7 M KOH at 60 degrees C), calculations show that at potentials below 0.5 V (RHE), the cathodes with thin regular-structure active layers demonstrate higher overall currents as compared with cathodes covered with thick active layers with a stochastic structure. However, the opposite trend is observed at potentials above 0.5 V. To increase the current in cathodes with thin regular-structure active layers, it is possible to, first, increase the active layer thickness and, second, decrease the size of hydrophobizer grains in them.
机译：介绍了具有规则结构的活性疏水活性层的概念。在这些层中，疏水剂参与了气孔的形成，该气孔代表了均匀分布在活性层上并在垂直于阴极表面的方向上延伸的一组直的相同杆（圆柱体）。具有薄的规则结构活性层的阴极的一个优点是其特性的可复制性和铂催化剂的含量低（高达mg / cm（2）的十分之一甚至百分之一）。具有规则结构的薄（厚度为几十微米）活性层和疏水剂（具有随机分布的聚四氟乙烯）的随机分布的厚（厚度为几百微米）电流层的电流特性比较制造。对于具有碱性电解质（60摄氏度时为7 M KOH）的燃料电池，计算表明，在电势低于0.5 V（RHE）的情况下，具有薄规则结构有源层的阴极与被厚阳极覆盖的阴极相比，具有更高的总电流具有随机结构的活动层。但是，在高于0.5 V的电势下观察到相反的趋势。要增加带有薄规则结构活性层的阴极中的电流，可以首先增加活性层的厚度，其次减小疏水性颗粒的尺寸。他们。

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