Sulfonated Graphene–Nafion Composite Membranes for Polymer Electrolyte Fuel Cells Operating under Reduced Relative Humidity
| Autor: | Kriangsak Ketpang, Osung Kwon, Sangaraju Shanmugam, Hasuck Kim, Akhila Kumar Sahu, Sang-Cheol Lee |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Graphene Proton exchange membrane fuel cell 02 engineering and technology Electrolyte Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound General Energy Membrane Sulfonate chemistry Chemical engineering law Nafion Polymer chemistry Fast ion conductor Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry C. 120:15855-15866 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.5b11674 |
| Popis: | Sulfonic acid-functionalized graphene (S-graphene) is employed as a promising inorganic filler as well as a solid acid proton conducting medium to realize a composite membrane with Nafion for polymer electrolyte fuel cell (PEFC) applications under reduced relative humidity (RH). The functionalization of graphene is performed by sulfonic acid-containing aryl radicals to increase the number of sulfonate groups per unit volume of a domain. A Nafion–S-graphene composite membrane is obtained by embedding S-graphene in Nafion, which provides high absorption of water and fast proton-transport across the electrolyte membrane under low RH values. The proton conductivity of the Nafion–S-graphene (1%) composite membrane at 20% RH is 17 mS cm–1, which is five times higher than that of a pristine recast Nafion membrane. PEFCs incorporating the Nafion–S-graphene composite membrane deliver a peak power density of 300 mW cm–2 at a load current density of 760 mA cm–2 while operating at optimum temperature of 70 °C under 2... |
| Databáze: | OpenAIRE |
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