Water Transport and PEFC Performance with Different Interface Structure between Micro-Porous Layer and Catalyst Layer
Water Transport and PEFC Performance with Different Interface Structure between Micro-Porous Layer and Catalyst Layer
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DOI：
10.1149/2.0451605jes
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发表时间：
2016-01-01
影响因子：
3.9
通讯作者：
Tanuma, Toshihiro
中科院分区：
文献类型：
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作者：
Aoyama, Yusuke;Suzuki, Kengo;Tanuma, Toshihiro
对于气体扩散电极(GDE)法制备的微孔层(MPL)和催化层(CL)之间的界面，无间隙的无缝界面表现出比采用贴花转移法界面的电池更好的性能。通过贴花转移方法，MPL只需热压到CL膜组件上。本研究探讨了界面结构对电池性能和MPL中水传输的影响。用冷冻的方法观察了水在多层横截面上的分布，即在短时间内将电池冷却到冰温以下，并用低温扫描电子显微镜观察到水以冰的形式存在。结果表明，使用GDE方法的膜电极组件(MEA)在高电流密度下改善了电池的性能。冷冻法和低温扫描电子显微镜的直接观察表明，用GDE法制作的MPL/CL界面没有积水，而用贴花方法制作的界面有水积聚。其他观察结果表明，随着温度的降低，两种类型的MEA中MPL内部的水量增加相似，并且两种类型的MEA之间的差异只是界面上的水量。(C)作者(S)2016年。由ECS出版。版权所有。
For interfaces between micro-porous layers (MPL) and catalyst layers (CL) made by the gas diffusion electrode (GDE) method, a seamless interface without gaps, shows better performance than that of cells with an interface made by the decal transfer method. With the decal transfer method, the MPL is simply hot-pressed to the CL-membrane assembly. This study investigates the effect of interface structure on cell performance and water transport in the MPL. Water distribution in cross sections of multiple layers were observed by a freezing method, where the cell is cooled below freezing temperature in short time and the water was observed in ice form by Cryo-SEM. The results show that a membrane electrode assembly (MEA) using the GDE method improves cell performance at high current densities. Direct observations by the freezing method and cryo-SEM show that there is no water accumulation at the MPL/CL interface made by the GDE method, while water accumulates at the interface made by the decal method. Other observations show that the water amount inside the MPL increases similarly in the two types of MEA when lowering the temperature, and the difference between the two types of MEA was only the water amount in the interface. (C) The Author(s) 2016. Published by ECS. All rights reserved.