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The influence of spatial confinement on the thermally excited stochasticcation dynamics of the room-temperature ionic liquid 1-N-butylpyridiniumbis-((trifluoromethyl)sulfonyl)imide ([BuPy][Tf_2N]) inside porouscarbide-derived carbons with various pore sizes in the sub- to a few nanometerrange are investigated by quasi-elastic neutron spectroscopy. Using thepotential of fixed window scans, i.e. scanning a sample parameter, whileobserving solely one specific energy transfer value, an overview of the dynamiclandscape within a wide temperature range is obtained. It is shown that alreadythese data provide a quite comprehensive understanding of theconfinement-induced alteration of the molecular mobility in comparison to thebulk. A complementary, more detailed analysis of full energy transfer spectraat selected temperatures reveals two translational diffusive processes ondifferent time scales. Both are considerably slower than in the bulk liquid andshow a decrease of the respective self-diffusion coefficients with decreasingnanopore size. Different thermal activation energies for molecularself-diffusion in nanoporous carbons with similar pore size indicate theimportance of pore morphology on the molecular mobility, beyond the pure degreeof confinement. In spite of the dynamic slowing down we can show that thetemperature range of the liquid state upon nanoconfinement is remarkablyextended to much lower temperatures, which is beneficial for potentialtechnical applications of such systems.

Ionic liquid dynamics in nanoporous carbon: A pore-size- and temperature-dependent neutron spectroscopy study on supercapacitor materials