Surface modifications of gasketless carbon composite bipolar plates for gas tightness of PEM fuel cells |
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Authors: | Jun Woo Lim Dai Gil Lee |
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Affiliation: | School of Mechanical, Aerospace & Systems Engineering, Korea Advanced Institute of Science and Technology, ME3221, 291 Daehak-ro, Yuseong-gu, Daejeon-shi 305-701, Republic of Korea |
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Abstract: | A carbon fiber composite gasketless bipolar plate for proton exchange membrane (PEM) fuel cells was developed using the groove of a trapezoidal shape, which develops large contact stresses due to a wedge mechanism. The surface of the composite groove was modified to increase gas tightness without using rubber gaskets. Graphite, polyimide (PI) and polyethylene terephthalate (PET) film were co-cure bonded on the surface of the bipolar plate during the compression molding process to change its surface hardness, which could affect the gas tightness. Additionally, plasma surface treatment and mechanical abrasion were used to modify the surface morphologies. Corrosion and gas tightness tests on the surface modified bipolar plates were performed to verify the reliability of the gasketless sealing method. |
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Keywords: | Carbon composite Gasketless bipolar plate Surface treatment Sealability Proton exchange membrane fuel cell |
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