Degradation studies on acid–base blends for both LT and intermediate T fuel cells

Stability of acid-excess acid–base blend membranes in all-vanadium redox-flow batteries

“…The membranes either were acidexcess blend membranes for low-temperature H 2 19 ). Based on these encouraging results, two of those membranes (the partially fluorinated blend membrane S1B1 and the nonfluorinated blend membrane S2B2) were selected for the application as proton-conducting membranes to a VRFB with the specific intention to investigate their stability and possible degradation.…”

“…The calibration of the system was done with polystyrene standards from PSS GmbH.The molecular weight values presented here are all measured using the RI71 refractive index detector. The use of the other detectors is not useful for degradation measurements because molecular weights lower than 10000 Da cannot be detected with light scattering or viscosity detectors19,25 .For suppression of intra-and intermolecular polymer interactions and interactions of the macromolecules with the column material, 5 g L -1 LiBr must be added to the eluent which transports the dissolved polymers through the columns during the measurement. For GPC analysis, 0.2 wt% solutions of the polymers and membranes in DMAc containing 5 g L -1 LiBr were prepared.…”

New nanocomposite proton conducting membranes based on a core–shell nanofiller for low relative humidity fuel cells

“…23,24 It was also shown that the performance of proton-conducting membranes may be improved by blending the proton-conducting ionomer with another polymer bearing basic functionalities. [25][26][27] Recently, it was reported that Nafion/[(M1 m O n )? (M2 x O y ) z ] membranes show reduced water uptake and improved mechanical properties and proton conductivity as compared to pristine Nafion 1 and [Nafion/(M x O y ) n ] membranes.…”

Novel cross-linked partially fluorinated and non-fluorinated polyaromatic PBI-containing blend membranes for SO2 electrolysis

“…It is clear from Table 3 that for the blend membranes 01-and 03-CEM, where the higher content acid polymer (Table 2) component contributing to the blend is the partially fluorinated SFS001, a more stable blended membrane is obtained withstanding significant sulfonation and/or dissolution at both 80 and 95 C. This can be ascribed to the arylene rings of the SFS001 polymer being more electron-deficient due to the partially fluorinated components present in comparison with the aromatic rings of the sPPSU polymer [24]. It has however been found that the loss of low molecular fractions (oligomers) of the sulfonated polymer (SFS001) does occur [19,20,32], which can account for the slight weight decrease noted after treatment.…”