Abigail - loading decreased conductivity Maximum tensile...

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OUTLINE Introduction Synthesis Results Conclusions
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Fuel cells are energy conversion devices that currently employ proton exchange membranes. Commonly used membrane: Nafion Disadvantages: Limited to acidic conditions Requires dilution of carbon fuels Requires thicker membranes to avoid swelling Problems with fuel crossover
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Alkaline fuel cells Higher efficiencies Nonprecious metal catalysts Lower cost Alkaline Anion Exchange Membranes (AAEM) Uses the flow of hydroxide ions instead of protons Opposes methanol crossover Crosslinking prevents swelling Tetraalkylammonium allows unobstructed ion conduction
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SYNTHESIS Ring Opening Metathesis Polymerization used Air Stable Grubbs Second Generation Catalyst
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RESULTS Increasing COE
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Unformatted text preview: loading decreased conductivity Maximum tensile stress between 2-2.5 loading ratio CATALYST LOADING Decreasing catalyst loading increased conductivity and decreased tensile stress TUNABLE SYSTEM Lower crosslinking density to increase conductivity for hydrogen fuels (swelling not a concern) High crosslinking density to minimize swelling for carbon fuels-No swelling up to 10M aqueous methanol at 60 o C COMPARING TO NAFION AAEM has comparable conductivity to Nafion-112 despite protons mobility 1.77 times faster than hydroxide CONCLUSIONS Used ROMP to develop new alkaline anion exchange membrane for fuel cells Tunable system Comprable conductivities to Nafion-112...
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Abigail - loading decreased conductivity Maximum tensile...

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