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Effect of Thickness and Hydrophobic Polymer Content of the Silicone Rubber Coated Fiberglass Fabric (1)

The effect of thickness and wetproof level of the gas diffusion layer on electrode flooding and cell performance was investigated. Three types of gas diffusion media were tested: SGL SIGRACET carbon papers, with and without a microporous layer, and Toray TGPH carbon paper without a microporous layer. Overall, it was found that SGL carbon paper with the microporous layer gave the best fuel cell performance even at low air stoichiometries. Silicone rubber coated fiberglass fabric was also found that adding poly(tetrafluoroethylene) (PTFE) to the gas diffusion layer could enhance gas transport and water transport when a cell operates under flooding condition, but excessive PTFE loading could lead to a high flooding level in the catalyst layer.