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• W2072238904 abstract "Operating proton exchange membrane fuel cells (PEMFCs) at elevated temperatures reduces the effect of CO poisoning, simplifies heat rejection, and results in more useful waste heat. Membrane electrode assemblies were developed to obtain high-performance PEMFCs at elevated temperatures and low relative humidity (RH) using the commercial Nafion 112 membrane. Cell polarization was obtained at three operating conditions (cell temperature °C/anode %RH/cathode %RH) of 80/100/75, 100/70/70, and 120/35/35, ambient pressure. Hydrogen/air cell performance at was 0.72, 0.69, and 0.58 V at the three conditions, respectively. A cell voltage of 0.65 V was obtained at the 120°C condition when oxygen was used instead of air. Reproducible cell performance with the maximum voltage difference of 10 mV was obtained at all operating conditions. The hydrogen crossover rate through the Nafion 112 membrane was relatively low, between 0.6 and at temperatures between 25 and 120°C. The electrochemical surface area of each cathode electrode, determined from cyclic voltammetry, was Pt, with nearly 73% catalyst utilization. The performance optimization approach can be applied to more advanced high-temperature membranes that have higher conductivity at low RH when these membranes are available in the future. © 2005 The Electrochemical Society. All rights reserved." @default.
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• W2072238904 date "2005-01-01" @default.
• W2072238904 modified "2023-10-16" @default.
• W2072238904 title "High-Performance PEMFCs at Elevated Temperatures Using Nafion 112 Membranes" @default.
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• W2072238904 doi "https://doi.org/10.1149/1.1855871" @default.
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