Journal
JOURNAL OF POWER SOURCES
Volume 109, Issue 1, Pages 38-46Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0378-7753(02)00058-7
Keywords
microporous; sublayer; carbon paper; catalyst layer; PEM fuel cells
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A microporous PTFE/carbon sublayer between the carbon paper and the catalyst layer played a crucial role in PEM fuel cells. Such a layer reduced the difference among different carbon paper types made by different manufacturers or by the same manufacturer at different times. When such a sublayer was present, the carbon paper seemed to function merely as a support that provided the mechanical strength for the sublayer. A sublayer was extremely useful if the carbon paper was prone to flooding. Sublayers of different thickness containing 24, 35 and 45% PTFE were tested. A four-cell stack could operate stably at a current density of 145 mA/cm(2) using unhumidified air and hydrogen when sublayered carbon paper was employed. (C) 2002 Elsevier Science B.V. All rights reserved.
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