期刊
JOURNAL OF POWER SOURCES
卷 195, 期 18, 页码 5975-5979出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2009.11.051
关键词
Passive DMFC stack; Vertical operation; Porous carbon plate; Vapor feed; High concentration of methanol
In order to develop a vertically arranged passive DMFC with a porous carbon plate, PCP, the effect of the head height of the methanol solution in contact with the porous carbon plate on the power generation was investigated for a 55 mm height using a single cell. The single cell was operated at several methanol concentrations greater than 70 wt%. By filling the reservoir with 90 and 100 wt% methanol solutions, power densities greater than 30 mW cm(-2) for over 10h were demonstrated. Based on the result of the single cell study, a passive DMFC stack consisting of 8 unit cells with the PCP was designed and fabricated. The power generation characteristics were then experimentally measured. The maximum power output of 1.8W. which was almost 10% lower than that expected from the single cell performance, was obtained with 100% methanol. At the same time, a nonuniform cell voltage among the 8 unit cells was found as a reason for the decreasing power output with the increasing current. (C) 2009 Elsevier B.V. All rights reserved.
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