Water Evolution in Direct Methanol Fuel Cell Cathodes Studied by Synchrotron X-Ray Radiography

被引：5
|
作者：
Schroeder, A. [1 ]
Wippermann, K. [1 ]
Arlt, T. [2 ]
Sanders, T. [3 ]
Baumhoefer, T. [3 ]
Markoetter, H. [2 ]
Mergel, J. [1 ]
Lehnert, W. [1 ,4 ]
Stolten, D. [1 ,5 ]
Manke, I. [2 ]
Banhart, J. [2 ,6 ]
机构：
[1] Forschungszentrum Julich, Inst Energy & Climate Res, Electrochem Proc Engn IEK 3, D-52425 Julich, Germany
[2] Helmholtz Zentrum Berlin, Inst Angew Mat Forsch, D-14109 Berlin, Germany
[3] Rhein Westfal TH Aachen, Inst Power Elect & Elect Drives ISEA, D-52066 Aachen, Germany
[4] Rhein Westfal TH Aachen, D-52066 Aachen, Germany
[5] Rhein Westfal TH Aachen, Chair Fuel Cells, D-52066 Aachen, Germany
[6] Tech Univ Berlin, D-10623 Berlin, Germany
来源：
FUEL CELLS | 2013年 / 13卷 / 03期
关键词：
Cathode Channels; DMFC; In-Plane Viewing Direction; Synchrotron Radiography; Through-Plane Viewing Direction; Water Droplets; RESOLUTION NEUTRON-RADIOGRAPHY; LOCAL CURRENT DISTRIBUTION; LIQUID WATER; IMAGING TECHNIQUE; LAND AREAS; TRANSPORT; BEHAVIOR; FLOW; QUANTIFICATION; VISUALIZATION;
D O I：
10.1002/fuce.201300041
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Water evolution, distribution, and removal in the cathodes of a running direct methanol fuel cell were investigated by means of synchrotron X-ray radiography. Radiographs with a spatial resolution of around 5m were taken every 5s. Special cell designs allowing for through-plane and in-plane viewing were developed, featuring two mirror-symmetrical flow field structures consisting of one channel with the through-plane design. Evolution and discharge of water droplets and the occurrence of water accumulations in selected regions of the channels were investigated. These measurements revealed a nonuniform distribution of water in the channels. Both irregular and periodic formation of water droplets were observed. In-plane measurements revealed, that the droplets evolve between adjacent carbon fiber bundles of the gas diffusion layer. The water distribution within the channel cross-section fits very well to the pressure difference between cathode channel inlet and outlet. The quick discharge of water droplets causes sudden decreases of the pressure difference up to 4.5mbar.
引用
收藏
页码：371 / 379
页数：9
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