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Water Repellent Coating of GDL with Different Concentration of Nano-sized PTFE Solution  

Jeong, Moon-Gook (Grad. School of Applied Chemistry Engineering, Dankook Univ.)
Song, Ki-Se (Grad. School of Chemical & Biochemical Engineering, Dongguk Univ.)
Cho, Tae-Hwan (Grad. School of Applied Chemistry Engineering, Dankook Univ.)
Choi, Weon-Kyung (School of Engineering, Dankook Univ.)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.20, no.4, 2009 , pp. 323-330 More about this Journal
Abstract
Efficiency of a fuel cell is determined by the generated water. If water is not removed sufficiently, water will be accumulated at GDL, which causes flooding. Therefore, water control is regarded as a crucial factor to sustain fuel ell performance. In this study, PTFE coating on the surface of carbon paper was carried out to establish optimum process for hydrophobic treatment of GDL. Carbon paper was immersed at different concentrations of nano-sized PTFE coating solution. Their characteristics were analyzed systematically by FE-SEM, water contact angle, cyclic voltamogam, XRD and FT-IR. The quantitative correlation between the amount of coated-PTFE on a carbon paper and concentration of coating solution was carefully investigated. It is suggested that the amount of PTFE-coating on a carbon paper can be managed by means of controling concentration of coating solution.
Keywords
Gas diffusion layer(GDL); Carbon paper; Polytetrafluoroethylene(PTFE); Water repellency; Water contact angle;
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