Physical and electrochemical properties of new structurally flexible imidazolium phosphate ionic liquids

Abstract

New structurally flexible 1-methyl- and 1,2-dimethyl-imidazolium phosphate ionic liquids (ILs) bearing oligoethers have been synthesized and thoroughly characterized. These novel ILs revealed high thermal stabilities, low glass transitions, high conductivity...

Charge storage performance of a structurally flexible hybrid ionic liquid electrolyte

“…Nevertheless, the slow scan rates of 1 and 5 mV s −1 show the reduction and oxidation in a chemical process whose effects are not electroactive; either the forward or reverse peak is missing or relatively minor in one case than the other 26,31‐35 . Relatively stable CV data were obtained for higher scan rates than at lower ones, almost similar for all temperatures.…”

“…As expected, diffusion coefficients of all the species increase with increasing temperature. The neutral TEOP solvent diffuses faster over the whole measured temperature range, although the increase in diffusivity is relatively lower for the solvent as compared with the cation and ion of the HILE 26‐30 . This is quite obvious due to the additional electrostatic interactions effecting the mobility of the Pyrr cation and DEEP anion.…”

“…The first half cycle of cyclic voltammetry (CV) at each scan rate provides ramp input launching the oxidation phase with a positive slope, which switches to the reduction phase with a negative ramp and negative slope for the second half cycle. However, the circuit strives for equilibrium through redox reactions to revert its starting state and repeats in the subsequent cycles, indicating cyclic reversibility of the system 26‐28 . Also, the peak ratio of oxidation and reduction currents gives a clear picture of the device stability; if it is 1, then the oxidative and reducing peak currents are identical, displaying a reversible nature of the device, which is visible for almost all scan rates and parameters for the system (Figure 2).…”

Structurally flexible pyrrolidinium- and morpholinium-based ionic liquid electrolytes

“…8). 55 The symmetric PO stretching band shifts to a lower wavenumber (∼1250 cm −1 ) for both [MmMPyrr][TEEP] and [MmMMorph][TEEP], and to ∼1255 cm −1 for [EmMPyrr][DEEP] and [EmMMorph][DEEP] (Fig. 8a and c).…”

“…Turning to the FTIR spectroscopy data, all the characteristic stretching frequencies for the functional groups of the 8). 55 The symmetric PQO stretching band shifts to a lower wavenumber (B1250 cm À1 ) for both 8a and c). The PO 3 stretching band shifts to a higher wavenumber (B1066 cm À1 ) for all ILs, while the O-P-O stretching band shifts towards a lower wavenumber (B950 cm À1 ; Fig.…”