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.
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收藏
页码：371 / 379
页数：9
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