Study of the transport of alkali metal ions in a nonaqueous polymer electrolyte based on Nafion

Thermally regenerative electrochemically cycled flow batteries with pH neutral electrolytes for harvesting low-grade heat

“…Such analysis also shows that optimizing the electrochemical kinetics at the electrode might have negligible improvement on TRFB performances if the other factors such as mass transfer become the dominant bottleneck. relatively low ionic conductivity of K + (3.3 × 10 -4 S/cm), 60 the membrane resistance was estimated to be ~ 5 Ω. Adding the and together, of a single cell was estimated to be Ω around 8 Ω, agreeing with the obtained by fitting the experimental discharging curves in Table 1.…”

Ammonium Form of Nafion Plasticized by Dimethyl Sulfoxide

“…Along with the plasticizer molecules attached to the ammonium ion, the DMSO molecules remain self-associative inside the polymer matrix, similar to the liquid DMSO. This is supported by the weak wide band of dipole-dipole interactions at 80 cm −1 .This behavior of the plasticizer in Nafion is also typical for other cationic forms, 41,54 except for the acidic form, in which the proton forms a strong complex with two molecules of DMSO. 55 The absence of such complexes in the SAXS.-The SAXS curves of all the studied films exhibit two characteristic peaks (Figure 4).…”

“…[25][26][27][28][29][30][31][32][33][34][35] By contrast, studies on the transport of other ions are scarce. 27,[36][37][38][39][40][41] In this regard, it is worth to note that the membranes in ammonium form (Nafion-NH 4 ), which is plasticized with various anhydrous (<1000 ppm of water) aprotic solvents, including DMSO, have unusually high ion conductivity. 27 The conductivity of such electrolytes significantly, 3-5 times, exceeds the conductivity of membranes in K + and Rb + forms (although radii of K + and Rb + comparable in radius to the ammonium one) and reaches the conductivity of membrane in the proton form.…”

Ion transport studies in PVA:NH4CH3COO gel polymer electrolytes

“…DMSO is a well-known plasticizer for several polymers on account of its distinct physical and chemical properties. 26 –28 The oxygen of DMSO, being electron donor, is expected to participate as a hydrogen bond accepter 28 and form a hydrogen bond with H (O δ –…H δ –) of PVA leading to the formation of a stable PVA-DMSO gel. A comparison of FTIR spectra of PVA-DMSO gel film with that of pure PVA (Figure 4) reveals the following.…”