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The impact of air contaminants on humidifier membrane performance
Daniel Ilk,Viktoria Frick,Christopher Hänel,Thomas Schiestel,Michael Schoemaker,Holger Kraus,Harry E. Hoster 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
Membrane humidifiers are often used to increase the performance and lifetime of polymer electrolytemembrane fuel cells (PEMFC). In order to avoid possible problems and consequential costs in later fuelcell applications due to the degradation of humidifier membranes, in this work five industrial humidifiermembranes (hollow fiber and flat sheet membranes in various material combinations) are tested againstfive pollutant gases from the environment (NO, NO2, NH3, SO2, O3). Herefor the water transfer capabilitiesbefore and after exposure to the pollutant gases is quantified. The results show that polyimides and fluoropolymersare degraded by ozone so that mechanical stability drastically decreases, so that they disintegrate. When polysulfone membranes are tested with pollutants a clear decline in water transfer can beseen over time. The decline of water transfer does not always seem to be due to the presence of harmfulgases but could also reflect physical degradation of the polymer. Perfluorinated sulfonic acid-based(PFSA) membranes are particularly sensitive to ammonia.