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• W2148005220 abstract "The goal of this research was to quantify the degradation experienced by a polymer electrolyte fuel cell after storage at subzero temperatures ranging from 0 to -40 ° C. The performance loss was determined by comparing the polarization and other applicable power curves before and after the subzero storage cycle. It was found that there are two distinct types of degradation experienced by the membrane. The first type was identified as a variance of the actual voltage-current relationship of the cell. This mode of degradation only pertained to the initial freeze/thaw cycle and was not observed after any number of subsequent cycles. The second type of degradation was only observed during the subsequent cycles, and mainly affected the high power regions of the operating range. A 5% reduction in current density and power output was observed as a result of further freeze/thaw cycles. Mass transport limitations may have been caused by the destruction of the meso-porous gas diffusion and micro-porous layers. The pore size, pore volume, and membrane surface area were quantified using an Autosorb physisorption tool. The results showed that the pore diameter of the catalyst and proton exchange layer did not increase significantly. However, the pore volume increased by a factor of ten and was confirmed by the surface area measurements of the membrane." @default.
• W2148005220 created "2016-06-24" @default.
• W2148005220 creator A5057176152 @default.
• W2148005220 date "2013-01-01" @default.
• W2148005220 modified "2023-09-27" @default.
• W2148005220 title "Low Temperature Polymer Electrolyte Fuel Cell Performance Degradation" @default.
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• W2148005220 doi "https://doi.org/10.12966/pts.07.02.2013" @default.
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