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Biofuel, CO2 Reduction,
Bio-inspired Constructs,
Biomemitic Catalysts,
Methanogenesis |
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Fuel Cells, Borohydrides, Catalysts, Ionic Liquids,
Si-Electroplating |
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| II-IV-V Semiconductors, Nanowires, Metal Complexes |
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| Certification, Fuel Cells, Training, Outreach |
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| Know-How, Library, Education |
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| AZ Solar, Forums, Media |
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General Characteristics of Protic Ionic Liquid Electrolytes
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Membraneless Fuel Cell Architectures
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Many ambient-to-high-temperature applications can be support by using ambient temperature molten salts, now also called "Ionic Liquids" (IL).
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ILs are vapor-free because of the Madelung energy characteristic of Coulombic systems (salts).
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lLs with exchangeable protons, called "protic ionic liquids" (PILs), can be prepared by using anhydrous Brönsted acid-base reactions.
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PILs form stable di-anions.
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PILs properties can be varied by selection of acids and bases.
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PILs may serve well as fuel cell electrolytes.
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ILs serve as unit transport number media for protons.
Because these liquids are chemical compounds, in which neither cations nor anions can be deposited at potentials of dihydrogen or oxygen electrodes.
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Conductivity data for Protic Ionic Liquids
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Some protic ionic liquids can have extremely high ionic conductivities, rivaling aqueous solutions. They can formation of dianion complexes, which have even higher conductance.
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Polarization Curves for H2/ O2 Fuel cell with 3 Liquid Electrolytes
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Ionic Liquids are potentially higher performance alternatives to phosphoric acid.
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Continue to tailor ionic liquids,
- Replace EAN with more stable ILs (TEAMS, fluorinated ILs, etc.)
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Synthesize Polymer electrolytes
- Polymer uses covalent bonding to keep degradable groups from coming to electrode
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Types of polymers
- poly-siloxane polyimidazoles, perfluorinated in backbone for stability
- crosslinked for film strength
- with ammines, sulfonates for high ionic liquid content for high conductivity
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Ultimate goal:
A stable and highly-conductive membrane with ionic groups covalently and electrostatically linked to membrane operating from below room temperature to over 120oC.
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For more information, please, contact professor Don Gervasio
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