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• W2043758522 startingPage "A1828" @default.
• W2043758522 abstract "As a measure of catalytic activity, , the current density at 0.3 V overpotential, was chosen to evaluate the oxygen reduction reaction (ORR) at elevated temperatures and various relative humidities (RH) for polymer exchange membrane (PEM) fuel cells. The purely kinetic reaction order of the ORR with respect to oxygen partial pressure is less than 1.0 and changes with the RH. The activation energy is at 100% RH and at 50% RH. The active electrochemical surface area of platinum changes little with RH. RH has a strong effect on the catalytic activity under dry conditions (0-60% RH), but under wet conditions its influence is unclear. The Tafel slope obtained in the current density range changes significantly with RH: wet conditions produce low Tafel slopes , dry conditions produce high Tafel slopes . Dependence of the RH on the oxygen reduction reaction (ORR) may be explained by the changes of the rate-determining reaction, proton activity, and adsorbed on the platinum surface. The ORR kinetic parameters obtained here are instructive for high-temperature fuel cell data analysis and performance improvement." @default.
• W2043758522 created "2016-06-24" @default.
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• W2043758522 date "2005-01-01" @default.
• W2043758522 modified "2023-10-04" @default.
• W2043758522 title "Effect of Elevated Temperature and Reduced Relative Humidity on ORR Kinetics for PEM Fuel Cells" @default.
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• W2043758522 doi "https://doi.org/10.1149/1.1984351" @default.
• W2043758522 hasPublicationYear "2005" @default.
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