In this work an in-situ Raman spectroelectrochemical study of the ionic liquid 1-methyl-3-propylimidazolium iodide MPIm+Ix- (x = 1 and 3) is presented. The in-situ Raman spectra were compared with those obtained for chemically formed MPIm+Ix- compositions. The article describes the formation of various polyiodides for different compositions (1 < x < 5), and their presence was correlated with enhanced ionic conductivity. Two-step conductivity increase was also reflected in decrease of the hydrogen bond interactions between the C-H ring groups and polyiodides.
COBISS.SI-ID: 3813402
This article describes properties of sol-gel functionalised ionic liquids on the basis of imidazolium and their application in EC devices. Electrolytes with protonic conductivity were prepared, as well electrolytes with lithium salts. The achieved change in photopic transmittance of EC devices was from 30-40 %. The investigations of the electrolytes showed that hydrolysis with acetic acid led to hydrogen bonding of acetic anions to proton on imidazolium ring, while in the case of trifluoroacetic acid the anions were not hydrogen bonded. Addition of lithium salts increased ionic conductivity.
COBISS.SI-ID: 3813146
Together with the laboratory of Prof. Decker from University of Rome »La Sapienza« we prepared EC device on the basis of ionic liquid N-butyl-N-methylpirrolidinium bis(trifluoromethanesulphonyl)imide, imobilised in PEO matrix. In this EC device we used optically active WO3 and V2O5 counter electrode, which were prepared in our laboratory. This EC device was tested over 2000 cycles of colouring and bleaching, and the charge was transfered in less than 100 s. The optical modulation was from initial 80% in the bleached state to around 30% in the coloured state at wavelength of 650 nm.
COBISS.SI-ID: 3680794
We studied interface effects of thin film V2O5 electrodes on top of ITO glass for Li+ intercalation by means of: depth-profiling by secondary ion mass spectroscopy (SIMS), electrochemical insertion-extraction of lithium ions by slow-scan cyclic voltammetry (SSCV) and by potentiostatic intermittent titration technique (PITT). We showed that Li+ distribution inside the oxide film is always far from homogeneous, and that different diffusion paths (parallel to interfaces as well as perpendicular to them) have to be considered in experiments with electrodes having areas of few cm2.
COBISS.SI-ID: 3948058
A novel bifunctional polyhedral oligomeric silsesquioxane (POSS) based silane precursor RxRy(SiO3/2)8, (x+y = 8), bearing 3-(N-(3-triethoxysilylpropyl)ureido)propyl and isooctyl groups was synthesized, and the corresponding coatings were prepared under the acid hydrolysis conditions and studied to assess their corrosion inhibition for AA 2024 alloy. The article is important for this project, because with the characterisation of structural properties of the coatings we introduced new IR spectroscopic approaches for the investigation of sol-gel materials.
COBISS.SI-ID: 3889178