New ionic liquids analogues, that is, deep eutectic solvents (DESs), have been successfully synthesized. These DESs have been synthesized by the reaction of phosphonium-based salts with different hydrogen bond donors. Many of these DESs have melting temperatures lower than 100 °C. Preliminary laboratory results showed that these DESs can be used in different applications, for example, electrochemical processes, separation of sugars, and so forth. Melting temperature, density, viscosity, pH, conductivity, and dissolved oxygen content of the novel phosphonium-based DESs were measured as a function of temperature. It was found that the type of the salt and hydrogen bond donor and the mole ratio of both compounds have a paramount effect on the studied properties.
Organic
polymer electrolytes attracted a great deal of attention
and research in the field of energy conversion and energy storage
due to their benefits such as appreciable ionic conductivity and transference
number, improved mechanical strength, thermal stability, and better
interaction with the electrodes. In this study, a polymer electrolyte
was synthesized from poly(vinyl alcohol) (PVA) by electrospinning
technique followed by soaking in a series of deep eutectic solvents
(DESs) to enhance the electrical conductivity of the product. The
result was a very thin, nonwoven membrane. The produced membranes
showed appreciable improvement in electrical conductivity from 2.78
× 10–6 to 2.27 × 10–2 S/cm after soaking in DES2. The observed improvement in electrical
properties opens the possibility for the PVA membranes to find their
applications in batteries, storage cells, flexible thermoelectric
devices, sensors, and solar cells.
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