EnergyMaterials - Quiz (May 18th) 1. The Teflon of backbone...

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1 Quiz (May 18 th ) 1. The Teflon of backbone in Nafion electrolytes provides mechanical strength, while the sulfonic acid groups provide charge sites for proton transport. 2. When some of normal acid’s hydrogen are replaced by alternative cations in the solid acid form, the materials act as a proton donor. What is this? Solid acid membrane 3. PEMFC electrodes serve a dual purpose: they must efficiently deliver/collect electrons from the fuel cell and also deliver/collect reactant/product species from the fuel cell. So, fuel cell electrodes must simultaneously provide high electrical conductivity and high porosity.
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2 4. The extremely high activity of Pt is believed to be due to a nearly optimal bonding affinity between Pt and hydrogen. The bonding is strong enough to promote facile absorption of H 2 from the gas phase onto a Pt surface and subsequent electron transfer, but bonding is weak enough to allow desorption of the resultant H+ ion into electrolyte. 5. While Pt is perfectly acceptable catalyst for H
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EnergyMaterials - Quiz (May 18th) 1. The Teflon of backbone...

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