Journal of the Japan Society of Powder and Powder Metallurgy
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
Paper
Development of Sintered Porous Metal for Passive Direct Methanol Fuel Cell Anode Wick with Function of Penetrating Liquid Fuel by Capillary Force and Releasing CO2 Gas
Kenji DATEShinsuke ANDOYuji KAWAUCHIKiyoshi TATSUGAWA
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JOURNAL OPEN ACCESS

2013 Volume 60 Issue 3 Pages 81-91

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Abstract
We investigated the structure of the sintered porous metal for passive DMFC anode wick. This porous metal was made by space holder method and consists of large voids formed by space holder of the mean diameter 1000 µm (1000 µm SH) and the skeleton part with small voids formed by space holder of the mean diameter 180 µm (180 µm SH) and pores originated from the space among metal particles. The amount of penetrating fuel (10 mass% methanol solution) was proportional to the square root of immersion time. So, we connected the penetrating rate with the porous structure by “a bundle of capillaries" model based on Washburn equation by Bruil and Murata, et al. Penetrating rate became larger by the conditions below: (1) decreasing 1000 µm SH and increasing 180 µm SH to increase the skeleton part volume and its porosity, (2) increasing the fraction of smaller porosity of the skeleton part to increase its specific surface area, (3) coating metal surface with SiO2 to improve its wettability. But more than 75 vol% of 1000 µm SH was needed to release CO2 smoothly during generation. Additionally, 30 mass% methanol solution improved the generating performance without an effect of methanol crossover.
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© 2013 by Japan Society of Powder and Powder Metallurgy

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