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

Validerad;2022;Nivå 2;2022-10-05 (joosat);
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 and wide electrochemical stability windows up to 6 V. Both anions and cations of 1-methyl-imidazolium ILs diffuse faster than the ions of 1,2-dimethyl-imidazolium ILs, as determined by pulsed field gradient nuclear magnetic resonance (PFG-NMR). The 1-methyl-imidazolium phosphate ILs showed relatively higher ionic conductivities and ion diffusivity as compare with the 1,2-dimethyl-imidazolium phosphate ILs. As expected, the diffusivity of all the anions and cations increases with an increase in the temperature. The 1-methyl-imidazolium phosphate ILs formed hydrogen bonding with the phosphate anions, the strength of which is decreased with increasing temperature, as confirmed by variable temperature 1H and 31P NMR spectroscopy. One of the representative IL, [EmDMIm][DEEP], presented a promising performance at elevated temperatures as an electrolyte in a supercapacitor composed of multiwall carbon nanotubes and activated charcoal (MWCNTs/AC) composite electrodes.

Filippov, Andrei,PhD,1957-Luleå tekniska universitet,Kemiteknik(Swepub:ltu)andfil (författare)
Khan, Inayat AliLuleå tekniska universitet,Kemiteknik(Swepub:ltu)inakha (författare)
Shah, Faiz Ullah,1981-Luleå tekniska universitet,Kemiteknik(Swepub:ltu)faisha (författare)
Luleå tekniska universitetKemiteknik (creator_code:org_t)

Ingår i:Physical Chemistry, Chemical Physics - PCCP: Royal Society of Chemistry (RSC)24:38, s. 23289-233001463-90761463-9084

Av författaren/redakt...: Bhowmick, Sourav; Filippov, Andrei ...; Khan, Inayat Ali; Shah, Faiz Ullah ...

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