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Synthesis of FunctionalizedMesoporous SilicaProton Exchange Membranesfor Fuel CellsJoe SelzlerGeorge AthensDr. Brad Chmelka


What is a fuel cell?


COGasoline/methanolCurrent technology problems• No hydrogen storage nor distribution network• Catalyst poisoning due to CO in H 2 stream at lowtemperatures• Poor PEM performance at high temperatures


Current PEM Material:Nafion TMF 2CCF 2C FF 2COCFCF 2CF 3CF 2C FOCFCF 2CF 3SO 3 HSO 3 H+ +SO 3 H+SO 3 HSO 3 HSO 3 H+ +SO 3 H+


Our Solution:Block-Copolymer-Templated Inorganic Materials12 nmChmelka, Stucky et al., Science, 279, 548 (1998)Stucky, Chmelka et al., Nature, 396, 152 (1998)Stucky, Chmelka et.al., Chem.Mater., 14, 3284 (2002)


Block-copolymer Self AssemblyCH 2-CH 2-OmCH 2 -CH-OCH 3 nCH 2-CH 2-Om


Block-copolymer Self AssemblyCH 2-CH 2-OnCH 2 -CH-O CH 2-CH 2-OCH 3 nn


Block-copolymer Self AssemblyCH 2-CH 2-OnCH 2 -CH-O CH 2-CH 2-OCH 3 nnwww.erikschemistry.com


Block-copolymer Self AssemblyCH 2-CH 2-OnCH 2 -CH-O CH 2-CH 2-OCH 3 nn


OC 2H 5Silica Network FormationOHC 2H 5O Si OC 2H 5+ HOH HO SiOH+C 2H 5OHOC 2H 5OH


OC 2H 5Silica Network FormationOHC 2H 5O Si OC 2H 5+ HOH HO SiOH+C 2H 5OHOC 2H 5OHCrosslinkOHOHHO Si O Si OHOHOH


OC 2H 5Silica Network FormationOHC 2H 5O Si OC 2H 5+ HOH HO SiOH+C 2H 5OHOC 2H 5OHCrosslinkOHOHHO Si O Si OHOHOHRemove polymerLord and Mackay, Indian Institute of Science


Structure CharacterizationSmall Angle X-Ray Diffraction


Transmission Electron Microscopy (TEM)


Current Work•Incorporate functional groups into silica thin filmsOOHOSOSi OO•Synthesize aluminosilica thin films including functional groups


AcknowledgementsChmelka Group:• George Athens (mentor)• Dr. Brad Chmelka (advisor)INSET program:• Trevor Hirst• Liu-Yen Kramer• Nick Arnold• Mike NorthernFunding:National Science FoundationArmy Research Office


www.prenhall.com


http://www.chem.utoronto.ca/coursenotes/CHM220/downloads/chapter12-summary.pdf


http://www.chem.utoronto.ca/coursenotes/CHM220/downloads/chapter12-summary.pdf

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