IMPREGNATION OF WATERWHEEL SUPRAMOLECULES AS PROTON CARRIERS IN NAFION-PERFLUORINATED IONOMER MEMBRANES
Nazir, NA; Kudo, H; Nishikubo, T; Thein Kyu
| HERO ID | 1447142 |
|---|---|
| In Press | No |
| Year | 2012 |
| Title | IMPREGNATION OF WATERWHEEL SUPRAMOLECULES AS PROTON CARRIERS IN NAFION-PERFLUORINATED IONOMER MEMBRANES |
| Authors | Nazir, NA; Kudo, H; Nishikubo, T; Thein Kyu |
| Journal | Journal of Materials Science |
| Volume | 47 |
| Issue | 20 (Oct 2012) |
| Page Numbers | 7269-7279 |
| Abstract | To improve proton conduction at elevated temperatures, in situ impregnation of Nafion membranes has been carried out by infusing Noria ''waterwheel'' supramolecules, containing numerous hydroxyl terminal groups, into the ionic domains of Nafion via swelling in mixed methanol and dimethylacetamide solutions. Fourier transform infrared (FTIR) spectroscopy study reveals that interspecies hydrogen bonding occurs between hydroxyl groups of Noria and sulphonate groups of Nafion, which has facilitated retaining the modifier molecules within the membrane. Water uptake experiments exhibit that the impregnation of Noria into Nafion ionic domains suppresses the membrane swelling. The ion exchange capacity also increases upon this impregnation. The proton conductivity is reduced at low operating temperatures relative to neat Nafion due to the loss of hydronium ion transport. However, the proton conductivity of the Noria-impregnated membrane shows 60 % improvement over that of neat Nafion at elevated temperatures of 115 degree C. Of particular importance is that the Noria-impregnated membrane exhibits improved thermal, mechanical, and electrochemical stabilities with proton conductivity enhancement at elevated temperatures. Moreover, there is no noticeable difference in FTIR spectra before and after the proton fuel cell tests, indicating the improvement in the chemical stability of the Noria-impregnated membranes under the present proton fuel environment. It appears that these waterwheel supramolecules may have potential utility as high temperature electrolytes (or solid proton carriers) in proton fuel cells. 30 Refs. |
| Doi | 10.1007/s10853-012-6681-y |
| Wosid | WOS:000307342000028 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science WOS:000307342000028 |
| Is Public | Yes |
| Keyword | DYNAMIC MECHANICAL ANALYSIS; MELTING TEMPERATURE; SWELLING; HIGH TEMPERATURE; RESISTANCE; INFRARED; LOW-TEMPERATURE; FOURIER TRANSFORM INFRARED SPECTROSCOPY; MICROPHASE SEPARATION; IR ABSORPTION; FEED RATE; SCATTERING; WATER EVAPORATION; LEACHING; TETRAFUNCTIONAL; CONDUCTION; FUEL CELL; ENVIRONMENT; IR SPECTROSCOPY; DOMAIN SIZE; TG; PIXEL; HEAT FLOW; HEAT RESISTANCE; CHEMICAL STABILITY; PROTON TRANSFER; COMPLEX IMPEDANCE; SOLUBILITY; RELAXATION TEMPERATURE; LOSS TANGENT; SULPHONATED TETRAFLUOROETHYLENE COPOLYMER; MIXING; CHEMICAL MODIFICATION; IR SPECTROMETRY; STABILITY; IONIC RESISTIVITY; RADIAL DISTRIBUTION FUNCTION; FOURIER TRANSFORM; SUPRAMOLECULE; HUMIDITY; EQUIVALENT WEIGHT; DIFFERENTIAL SCANNING CALORIMETER; CRYSTALLINE PHASE; CRYSTALLINITY; POLYIONENE; COMPRESSED AIR; PERFLUORINATED; FTIR; IR SPECTRUM; NUT; DYNAMIC PROPERTIES; CATHODE; INFRARED SPECTRA; DYNAMIC MECHANICAL PROPERTY; ENHANCEMENT; SULFONATE GROUP; X-RAY SCATTERING; X-RAY DIFFRACTION; ELECTROLYTE; ELECTRICAL RESISTIVITY; DIMENSIONAL STABILITY; HIGH-TEMPERATURE; INFRARED SPECTROPHOTOMETRY; DIFFERENTIAL THERMAL ANALYSIS; COUNTERION; PERCOLATION; DIPOLE; MEMBRANE; DIFUNCTIONAL; RH; DSC; HYDROGEN BONDING; IMPREGNATED; DIFFERENTIAL SCANNING CALORIMETRY; ION EXCHANGE CAPACITY; HYPERBRANCHED; GLASS TRANSITION; WIDE ANGLE X-RAY DIFFRACTION; NAFION; PROPERTIES; SPRAY GUN; WATER UPTAKE; TECHNICAL; MECHANICAL PROPERTIES; DESULPHONATION; FTIR SPECTROSCOPY; CARRIER; ATR; PROTONIC; REFLECTANCE SPECTROSCOPY; WAXD; MOISTURE ABSORPTION; CAPACITOR; ADJUSTABLE; IMPREGNATE; BOUND WATER; SIGMOIDAL; ATTENUATED TOTAL REFLECTANCE SPECTROSCOPY; SULPHONIC GROUP; MOLECULAR STRUCTURE; RESISTIVITY; STRESS RELAXATION; ELECTRONIC; IONOMER; GLASS TRANSITION TEMPERATURE; INFRA-RED SPECTRA; HUMIDIFIER; ION TRANSPORT; SELECTIVE SOLUBILITY; SELF-ASSOCIATION; PHASE SEPARATION; THERMAL ANALYSIS; HYDROXYL GROUP; MASS RATIO; CHEMICAL STRUCTURE; RESISTOR; PROTON CARRIER; EQUIVALENT CIRCUIT; THERMAL INSTABILITY; COLE-COLE PLOT; SWELL; INFUSION; HYDROPHILICITY; GEGENION; IMPEDANCE; PERFLUORINATION; DMA; IN SITU; CIRCULATION; DTA; MECHANICAL STABILITY; TINTED; ATTENUATED TOTAL REFLECTION SPECTROSCOPY; WATER ABSORPTION; STORAGE MODULUS; SPECTROSCOPY; MODIFIER; X-RAY; SINUSOIDAL; FREQUENCY RANGE; MECHANICAL STRENGTH; CRYSTAL STRUCTURE; INFRARED ABSORPTION; DYNAMIC MECHANICAL PROPERTIES; IONENE POLYMER; B.P.; ELECTROCHEMICAL; REORGANISATION; IMPREGNATION; BONDED; REFLECTANCE SPECTROMETRY; DESULFONATION; HYDROPHILIC; OLIGOMER; ATR SPECTROSCOPY; RELATIVE HUMIDITY; SULPHONATE GROUP; FTIR SPECTRA; SULFONIC GROUP; FEED RATIO; ELEVATED TEMPERATURE; INFRA-RED; HEAT RESISTANT; THERMAL STABILITY; LADDER; END POINT; HYSTERESIS; HYDROXY GROUP; VIBRATIONAL SPECTROSCOPY; BOILING POINT; HEAT-RESISTANT; RETAINING; CONDENSATION REACTION; PROTON TRANSPORT; INFRARED SPECTROSCOPY; IN-SITU; POLYESTER; REORGANIZATION; INTERMOLECULAR COMPLEXATION; SULFONATED TETRAFLUOROETHYLENE COPOLYMER; LOW TEMPERATURE; DIFFRACTION; ANALYSIS; NON-CRYSTALLINE; PROTON CONDUCTIVITY; CURRENT DENSITY; INTERCONNECTIVITY; IR SPECTRA; APROTIC |