首页> 外文期刊>Journal of power sources >Impact of liquid water on oxygen reaction in cathode catalyst layer of proton exchange membrane fuel cell: A simple and physically sound model
【24h】

Impact of liquid water on oxygen reaction in cathode catalyst layer of proton exchange membrane fuel cell: A simple and physically sound model

机译:液态水对质子交换膜燃料电池阴极催化剂层中氧气反应的影响:简单而物理合理的模型

获取原文
获取原文并翻译 | 示例
       

摘要

When cells work at high current density, liquid water accumulates in their catalyst layer (CL) and the gaseous oxygen could dissolve into the water and the ionomer film simultaneously; their associated dissolved concentrations in equilibrium with the gaseous oxygen are also different. Based on a CL acquired using tomography, we present new methods in this paper to derive agglomerate models for partly saturated CL by viewing the movement and reaction of the dissolved oxygen in the two liquids (water and ionomer) and the agglomerate as two independent random processes. Oxygen dissolved in the water moves differently from oxygen dissolved in the ionomer, and to make the analysis tractable, we use an average distribution function to describe the average movement of all dissolved oxygen. A formula is proposed to describe this average distribution function, which, in combination with the exponential distribution assumed in the literature for oxygen reaction, leads to a simple yet physically sound agglomerate model. The model has three parameters which can be directly calculated from CL structure rather than by calibration. We explain how to calculate these parameters under different water contents for a given CL structure, and analyse the impact of liquid water on cell performance. (C) 2016 Elsevier B.V. All rights reserved.
机译:当电池在高电流密度下工作时,液态水会积聚在其催化剂层(CL)中,而气态氧会同时溶解在水和离聚物膜中;它们与气态氧平衡的相关溶解浓度也不同。基于使用断层扫描获得的CL,我们提出了新的方法,通过将两种液体(水和离聚物)中的溶解氧的运动和反应以及团聚体视为两个独立的随机过程,得出了部分饱和CL的团聚体模型。溶解在水中的氧的移动与溶解在离聚物中的氧的移动方式不同,为了使分析变得容易,我们使用平均分布函数来描述所有溶解氧的平均移动。提出了一个公式来描述这种平均分布函数,再结合文献中假设的用于氧反应的指数分布,得出一个简单但物理上合理的团聚模型。该模型具有三个参数,可以直接从CL结构而不是通过校准来计算。我们解释了如何针对给定的CL结构在不同含水量下计算这些参数,并分析液态水对电池性能的影响。 (C)2016 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号