Journal
JOURNAL OF SOLUTION CHEMISTRY
Volume 42, Issue 12, Pages 2329-2341Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10953-013-0111-x
Keywords
Acetylacetonate; Solubility; Deep eutectic solvents; Electrochemical energy storage
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Funding
- University of Malaya [UM.C/HIR/MOHE/ENG/18, UM.C/HIR/MOHE/ENG/25]
- Ministry of Higher Education in Malaysia [UM.C/HIR/MOHE/ENG/18, UM.C/HIR/MOHE/ENG/25]
- Deanship of Scientific Research at King Saud University [RGP-VPP-108]
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Seven commercially sourced acetylacetonate salts were investigated in deep eutectic solvents (DESs that were prepared from ethylene glycol and trifluoroacetamide hydrogen bond donors) by cyclic voltammetry, to identify electrolytes suitable for future applications in electrochemical energy storage devices. Although the solubilities are low and on the order of 0.02 mol center dot L-1 for the most soluble salts, some were found to display encouraging quasi-reversible electrochemical kinetics. For instance, the diffusion coefficients of copper(II) acetylacetonate and iron(III) acetylacetonate in the trifluoroacetamide based DES are 1.14 x 10(-8) and 5.12 x 10(-9) cm(2)center dot s(-1), which yields rate constants of 3.16 x 10(-3) and 8.43 x 10(-6) cm center dot s(-1), respectively. These results are better than those obtained with the DESs prepared from ethylene glycol. The poor kinetics of the iron(III) acetylacetonate system was possibly due to the hygroscopic nature of the DESs that resulted in a continuous build-up of moisture in the system in spite of the maintenance of an inert atmosphere by means of a plastic glove bag. Further work is thus envisaged in an inert dry box that could lead to H-type glass cell charge/discharge experiments in the future.
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