By C. Sequeira, D. Santos
ISBN-10: 1845693302
ISBN-13: 9781845693305
ISBN-10: 184569628X
ISBN-13: 9781845696283
ISBN-10: 1845697723
ISBN-13: 9781845697723
ISBN-10: 1845699777
ISBN-13: 9781845699772
ISBN-10: 1855739321
ISBN-13: 9781855739321
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1992). It was claimed that these properties made them useful for DMFCs but, up to now, no fuel cell performance data were given. It would be interesting to study the methanol crossover in this membrane; its chemical stability in practical fuel cell systems should also be addressed. , 1994). , 1995). The conductivities are higher than those obtained from many of the above non-fluorinated membranes. Differential scanning calorimetry (DSC) measurements indicate that these protonic gels are stable up to 120 °C.
It was claimed that the high stability of the fluorine atoms attached to the alkali carbon atoms impacts oxidative and thermal stability superior to that exhibited by conventional ion exchange polymers such as polystyrene sulphonic acid (La Conti, 1988). The limited use of these membranes in fuel cells may be related to their limited mechanical properties and/or chemical resistance in real fuel cell conditions. , 1995; Savadogo and Roberge, 1997). © Woodhead Publishing Limited, 2010 16 Polymer electrolytes The most significant earliest work carried out on the radiation grafting of polymers was achieved and reviewed by Chapiro (1962).
An average value of the electrical conductivity can be obtained by measuring the AC conductivity of Pn:MX between two inert electrodes and with an inert gas passing over the sample. Alternatively, four probes can be used and the IR drop is measured between the two inner probes (see Fig. 2). However, both of these configurations leave the chemical potentials of M and X ill defined. It is known that the partial conductivities may be decisively affected by the M/X ratio, which will be established by fixing the chemical potentials.
Polymer Electrolytes - Funds. and Applns. by C. Sequeira, D. Santos
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