Proton conducting membranes in fully anhydrous conditions at elevated temperature: Effect of Nitrilotris(methylenephosphonic acid) incorporation into Nafion- and poly(styrenesulfonic acid)

Polyelectrolyte microcapsules as ionic liquid reservoirs within ionomer membrane to confer high anhydrous proton conductivity

“…9c clearly revealed that the conductivities of SP-PMC-X-IL were higher than those of SP-PMS-X-IL under identical conditions, reasonably due to the higher IL uptake in SP-PMC-X-IL. It should be noted that SP-PMC-12%-IL achieved the maximum anhydrous conductivity of 33.7 mS cm À1 at 150 C, which was 2.6 times of that of SP-IL (13.2 mS cm À1 ) under identical conditions, and much higher than that of the commercial Nafion (1.0 mS cm À1 ) [46]. Although the highest anhydrous proton conductivity in this work (33.7 mS cm À1 at 150 C) cannot rival that of polybenzimidazole-H 3 PO 4 membranes, the acidic SPEEK matrix allows higher low-temperature proton conductivity, faster oxygen reduction kinetics, and lower sensibility to oxidative degradation by peroxides [47,48].…”

Chemical and electrochemical characterization of Nafion containing silver nanoparticles in a stripe-like distribution

“…34 Besides de membrane potential, another characteristic electrochemical parameters associated to the diffusive transport of ions through charged membranes is the ion transport number (t i ) which represents the fraction of the total electric current transported by one ion (t i = I i /I T ). 37 Taking into account the t i definition, the following relationship between the ions in the solutions should be fulfilled:  i (t i ) = 1. Thus, in the case of single salts, the following relation between cation (t + ) and anion (t -) transport numbers exists: t + + t -= 1.…”

“…The broad signals or haloes located between 2 = 12 and 2 = 18 are typical of the neat Nafion-117 corresponding to the crystalline and amorphous part of the polymer and are in agreement with those found in the literature. [37][38][39] The broad signal of the matrix made it difficult to clearly identify any peak corresponding to minor components but it can be clearly observed that sample N1 contained metallic silver as it can be deduced from the peaks found at the following values of 2: 36.5, 44.5 and 65 (approximately) which correspond to reflections of the face-cantered cubic Ag crystalline lattices (111), (200) and (220). Since Ag peaks are broadened, it is possible to affirm that Ag(I) ions were successfully reduced to Ag-NPs at high extent.…”

SPEEK-based proton exchange membranes modified with MOF-encapsulated ionic liquid

“…Nowadays, commercial membranes such as perfluorinated sulfonic acid (PFSA) membranes [5] are the most used in proton exchange membrane fuel cells (PEMFCs) and, although they have significant proton conductivity, they present disadvantages such as high production cost, high fuel permeability, high dependence on water for good performance and operating only at temperatures below 80 C [6]. In this context, alternative membranes have been developed seeking to obtain properties such as low cost, easy synthesis, good thermal and mechanical stability and eco-friendliness [7].…”