Proton conduction of novel calcium phosphate nanocomposite membranes for high temperature PEM fuel cells applications |
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| Affiliation: | 1. United Arab Emirates University, Department of Chemical and Petroleum Engineering, PO. Box 15551, Abu Dhabi, United Arab Emirates;2. American University of Sharjah, Department of Chemical Engineering, PO. Box 26666, Sharjah, United Arab Emirates;3. Sustainable and Renewable Energy Engineering Department, University of Sharjah, PO. Box 27272, Sharjah, United Arab Emirates |
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| Abstract: | This work describes the synthesis and evaluation of nanocomposite membranes based on calcium phosphate (CP)/ionic liquids (ILs) for high-temperature proton exchange membrane (PEM) fuel cells. Several composite membranes were synthesized by varying the mass ratios of ILs with respect to the CP and all supported on porous polytetrafluoroethylene (PTFE). The membranes exhibit high proton conductivities. Two ionic liquids were investigated in this study, namely, 1-Hexyl-3- methylimidazolium tricyanomethanide, HMIM]C4N3?], and 1-Ethyl-3-methylimidazolium methanesulfonate, EMIM]CH3O3S?]. At room temperature, the CP/PTFE/HMIM]C4N3?] composite membrane possessed a high proton conductivity of 0.1 S cm?1. When processed at 200 °C, and fully anhydrous conditions, the membrane showed a conductivity of 3.14 × 10?3 S cm?1. Membranes based on CP/PTFE/EMIM]CH3O3S?] on the other hand, had a maximum proton conductivity of 2.06 × 10?3 S cm?1 at room temperature. The proton conductivities reported in this work appear promising for the application in high-temperature PEMFCs operated above the boiling point of water. |
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| Keywords: | Composite membranes Fuel cells High temperature PEM Calcium phosphate Ionic liquids |
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