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- W2950243025 abstract "In order to expand our understanding of a potential zinc-based battery electrolyte, we have characterized the physical and transport properties of the ionic liquid (IL) 1-butyl-1-methylpyrrolidinium dicyanamide ([C₄mpyr][dca]) containing various levels of both Zn²⁺ and H₂O. Detailed measurements of density, viscosity, conductivity, and individual anion and cation diffusion coefficients using pulsed-field-gradient (PFG) NMR combined with NMR chemical shifts and spin–lattice relaxation (T₁) NMR experiments provide insights into the motion and chemical environment of all molecular species. We find that the various techniques for probing ion transport and dynamics form a coherent picture as a function of electrolyte composition. Zn²⁺ addition causes a moderate reduction in the self-diffusion of the IL anion and cation, whereas the addition of H₂O increases ion mobility by increasing the liquid’s overall fluidity. Temperature-dependent ¹³C T₁ experiments of the dca carbon analyzed using Bloembergen–Purcell–Pound fits show monotonic slowing of anion dynamics with Zn²⁺ addition, suggesting increased Zn²⁺/dca– association. T₁ experiments show minimal change in the spin–lattice relaxation of cation or anion upon H₂O addition, suggesting that H₂O is playing no significant role in Zn²⁺ speciation. Finally, we employ a novel electrophoretic NMR technique to directly determine the electrophoretic mobility of the C₄mpyr cation, which we discuss in the context of impedance-based conductivity measurements." @default.
- W2950243025 created "2019-06-27" @default.
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- W2950243025 date "2014-01-01" @default.
- W2950243025 modified "2023-09-28" @default.
- W2950243025 title "Influence of Zn2+ and Water on the Transport Properties of a Pyrrolidinium Dicyanamide Ionic Liquid B" @default.
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