1 Department of Energy Technology, The Faculty of Engineering and Science, Aalborg University, VBN2 The Faculty of Engineering and Science (ENG), Aalborg University, VBN3 Thermal Energy Systems, The Faculty of Engineering and Science, Aalborg University, VBN4 Aalborg University, VBN5 Fluid Mechanics and Combustion, The Faculty of Engineering and Science, Aalborg University, VBN6 Department of Chemistry and Bioscience, The Faculty of Engineering and Science, Aalborg University, VBN
This paper investigates the effects of methanol and water vapor on the performance of a high temperature proton exchange membrane fuel cell (HT-PEMFC). A H3PO4-doped polybenzimidazole (PBI) membrane electrode assembly (MEA), Celtec P2100 of 45 cm2 of active surface area from BASF was employed. A long-term durability test of around 1250 h was performed, in which the concentrations of methanol-water vapor mixture in the anode feed gas were varied. The fuel cell showed a continuous performance decay in the presence of vapor mixtures of methanol and water of 5% and 8% by volume in anode feed. Impedance measurements followed by equivalent circuit fitting revealed that the effects were most significant for intermediate-high frequency resistances, implying that charge transfer losses were the most significant losses. Vapor mixture of 3% in feed, however, when introduced after operation at 8%, showed positive or no effect on the cell's performance in these tests.
International Journal of Hydrogen Energy, 2012, Vol 37, Issue 23
High temperature PEM; Fuel cell; Methanol; Impedance spectroscopy