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Synthesis and characterization of Br- and Cl- anion exchange membranesfor use in alkaline polymer electrolyte fuel cells
Tansey, Emily Herring, Andrew M. Horan, James L. Vandiver, Melissa A.
Tansey, Emily
Herring, Andrew M.
Horan, James L.
Vandiver, Melissa A.
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2011-08
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Abstract
Proton exchange membrane (PEM) fuel cells utilize pure hydrogen fuel and platinum-based catalysts. Hydrogen has a relatively low energy density, so large-scale fuel storage is required to operate PEMs. Pt-based catalysts further constrict the manufacturability of PEMs due to scarcity of platinum. As a fuel source, methanol has a greater energy density than hydrogen; however, as PEMs require H+ ionic transport, a fuel processor must be included with the fuel cell assembly to convert CH3OH to hydrogen. Alkaline anion-exchange membrane (AAEM) fuel cells operate directly with methanol. Improved oxidation of CH3OH occurs due to the alkaline nature of AAEMs. Furthermore, AAEMs require significantly less Pt-based metal in their catalysts and benefit from the mechanical and chemical stability that accompany a solid-state electrolyte.
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