Assessing the performance of reactant transport layers and flow fields towards oxygen transport: A new imaging method based on chemiluminescence
Assessing the performance of reactant transport layers and flow fields towards oxygen transport: A new imaging method based on chemiluminescence
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评估反应物传输层和氧传输流场的性能：基于化学发光的新成像方法
DOI：
10.1016/j.jpowsour.2014.10.055
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发表时间：
2015
影响因子：
9.2
通讯作者：
Lopes T
中科院分区：
文献类型：
--
作者：
Lopes T
提出了一种新的、简单而精确的非原位光学成像方法，该方法可以间接测量燃料电池组件内的氧分压（如臭氧）。氧分布的图像记录具有较高的空间（1020 μm）和时间（40 ms）分辨率。这种方法被应用到评估氧气浓度的伪聚合物电解质燃料电池（PEFC）的面对，与蛇形设计的流场。我们表明，产生的光的量与臭氧的分压成正比，以同样的方式在PEFC中的局部电流密度与双分子氧的分压成正比。因此，模拟的系统提供了相关的信息与PEFC相同的几何结构，在相同的化学计量比操作。这种新的方法允许直接成像下的流动土地由于相邻通道之间的压力梯度和非层流效应由于二次流aroundU形转弯。这些是在指导材料开发和验证建模研究方面具有根本重要性的重大发现。我们发现，与许多模拟论文，平流是一个重要的机制，在气体扩散层（更恰当的“反应物运输层”）和微孔层。不包括这些影响的模型可能会低估反应物传输到催化剂层。
A new, simple and precise ex-situ optical imaging method is developed which allows indirect measurement of the partial pressure of oxygen (as ozone) within fuel cell components. Images of oxygen distribution are recorded with higher spatial (∼20 μm) and time (40 ms) resolutions. This approach is applied to assess oxygen concentration across the face of a pseudo polymer electrolyte fuel cell (PEFC), with a serpentine design flow field. We show that the amount of light produced is directly proportional to the partial pressure of ozone, in the same way as the local current density in a PEFC is proportional to the partial pressure of bimolecular oxygen. Hence the simulated system provides information relevant to a PEFC with the same geometry operating at the same stoichiometric ratio. This new approach allows direct imaging of flow under lands due to pressure gradients between the adjacent channels and non-laminar flow effects due to secondary flow aroundU-turns. These are major discoveries of fundamental importance in guiding materials development and in validating modelling studies. We find that contrary to many simulation papers, advection is an important mechanism in both the gas diffusion layer (more properly “reactant transport layer”) and the microporous layer. Models which do not include these effects may underestimate reactant transport to the catalyst layer.
燃料电池气体通道和扩散层中的共轭传质
DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
S. Beale
通讯作者：
S. Beale
用于基于 Cf-252 的中子射线照相的新型电子成像系统
DOI：
--
发表时间：
2003
期刊：
APCNDT2003, 11^<th> Asia-Pacific Conference on Non Destructive Testing
影响因子：
--
作者：
Satoru Ito;Tetsuo Matsumoto;Koichi Mochiki
通讯作者：
Koichi Mochiki
DOI：
--
发表时间：
1983
期刊：
影响因子：
--
作者：
G. Jones;W. Bergmark
通讯作者：
W. Bergmark