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By Badii R., Politi A.

ISBN-10: 0521418909

ISBN-13: 9780521418904

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Finally, samples were observed by a CRYO-SEM at −160◦ C with an acceleration voltage of 5 kV. 27 shows photographs at the surface of the CL and image-processed pictures with and without the MPL. 7 A cm−2 with relative humidity of 100% for 1 hour. 2 gives the average percentages of ice-covered areas in the image-processed pictures. The area increases with the current density and relative humidity. Without the MPL, the ice-covered areas under the channels and under the lands are similar. However, with the MPL the ice-covered area is significantly smaller under the lands than under the channels.

Experimentally suggested liquid water distribution and gas flow paths: (I) the early stage of the voltage drop, and (II) the stabilized high-voltage stage with large pressure variations. has also been observed at the other stoichiometric ratios. 10. The cell voltage stabilizes at a relatively high level, when the pressure drop becomes high and the pressure variation also becomes larger at this stage. e. smaller λ. 12. In the early stage of the operation (I), the produced water flows out to the channel through the relatively wide paths in the GDL and accumulates at the surface of the GDL.

Low cost manufacturing techniques are important for a compacted fuel cell. On the other hand, theories focusing on micro and nano-scale mechanisms should be established, which will bring great benefit for the optimization of fuel cells of all sizes. About the editors Prof. C. Leung, born in Hong Kong in 1959, received his BEng in 1982 and PhD in fluid dynamics in 1988, both from the Department of Mechanical Engineering at the University of Hong Kong. He had worked in the Hongkong Electric Co. , for five years leading the air pollution section of the company.

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Complexity by Badii R., Politi A.


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